drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cadence MHDP8546 DP bridge driver.
   4  *
   5  * Copyright (C) 2020 Cadence Design Systems, Inc.
   6  *
   7  * Authors: Quentin Schulz <[email protected]>
   8  *          Swapnil Jakhade <[email protected]>
   9  *          Yuti Amonkar <[email protected]>
  10  *          Tomi Valkeinen <[email protected]>
  11  *          Jyri Sarha <[email protected]>
  12  *
  13  * TODO:
  14  *     - Implement optimized mailbox communication using mailbox interrupts
  15  *     - Add support for power management
  16  *     - Add support for features like audio, MST and fast link training
  17  *     - Implement request_fw_cancel to handle HW_STATE
  18  *     - Fix asynchronous loading of firmware implementation
  19  *     - Add DRM helper function for cdns_mhdp_lower_link_rate
  20  */
  21
  22 #include <linux/clk.h>
  23 #include <linux/delay.h>
  24 #include <linux/err.h>
  25 #include <linux/firmware.h>
  26 #include <linux/io.h>
  27 #include <linux/iopoll.h>
  28 #include <linux/irq.h>
  29 #include <linux/media-bus-format.h>
  30 #include <linux/module.h>
  31 #include <linux/of.h>
  32 #include <linux/phy/phy.h>
  33 #include <linux/phy/phy-dp.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/slab.h>
  36 #include <linux/wait.h>
  37
  38 #include <drm/display/drm_dp_helper.h>
  39 #include <drm/display/drm_hdcp_helper.h>
  40 #include <drm/drm_atomic.h>
  41 #include <drm/drm_atomic_helper.h>
  42 #include <drm/drm_atomic_state_helper.h>
  43 #include <drm/drm_bridge.h>
  44 #include <drm/drm_connector.h>
  45 #include <drm/drm_edid.h>
  46 #include <drm/drm_modeset_helper_vtables.h>
  47 #include <drm/drm_print.h>
  48 #include <drm/drm_probe_helper.h>
  49
  50 #include <asm/unaligned.h>
  51
  52 #include "cdns-mhdp8546-core.h"
  53 #include "cdns-mhdp8546-hdcp.h"
  54 #include "cdns-mhdp8546-j721e.h"
  55
  56 static void cdns_mhdp_bridge_hpd_enable(struct drm_bridge *bridge)
  57 {
  58         struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
  59
  60         /* Enable SW event interrupts */
  61         if (mhdp->bridge_attached)
  62                 writel(readl(mhdp->regs + CDNS_APB_INT_MASK) &
  63                        ~CDNS_APB_INT_MASK_SW_EVENT_INT,
  64                        mhdp->regs + CDNS_APB_INT_MASK);
  65 }
  66
  67 static void cdns_mhdp_bridge_hpd_disable(struct drm_bridge *bridge)
  68 {
  69         struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
  70
  71         writel(readl(mhdp->regs + CDNS_APB_INT_MASK) |
  72                CDNS_APB_INT_MASK_SW_EVENT_INT,
  73                mhdp->regs + CDNS_APB_INT_MASK);
  74 }
  75
  76 static int cdns_mhdp_mailbox_read(struct cdns_mhdp_device *mhdp)
  77 {
  78         int ret, empty;
  79
  80         WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
  81
  82         ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_EMPTY,
  83                                  empty, !empty, MAILBOX_RETRY_US,
  84                                  MAILBOX_TIMEOUT_US);
  85         if (ret < 0)
  86                 return ret;
  87
  88         return readl(mhdp->regs + CDNS_MAILBOX_RX_DATA) & 0xff;
  89 }
  90
  91 static int cdns_mhdp_mailbox_write(struct cdns_mhdp_device *mhdp, u8 val)
  92 {
  93         int ret, full;
  94
  95         WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
  96
  97         ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_FULL,
  98                                  full, !full, MAILBOX_RETRY_US,
  99                                  MAILBOX_TIMEOUT_US);
 100         if (ret < 0)
 101                 return ret;
 102
 103         writel(val, mhdp->regs + CDNS_MAILBOX_TX_DATA);
 104
 105         return 0;
 106 }
 107
 108 static int cdns_mhdp_mailbox_recv_header(struct cdns_mhdp_device *mhdp,
 109                                          u8 module_id, u8 opcode,
 110                                          u16 req_size)
 111 {
 112         u32 mbox_size, i;
 113         u8 header[4];
 114         int ret;
 115
 116         /* read the header of the message */
 117         for (i = 0; i < sizeof(header); i++) {
 118                 ret = cdns_mhdp_mailbox_read(mhdp);
 119                 if (ret < 0)
 120                         return ret;
 121
 122                 header[i] = ret;
 123         }
 124
 125         mbox_size = get_unaligned_be16(header + 2);
 126
 127         if (opcode != header[0] || module_id != header[1] ||
 128             req_size != mbox_size) {
 129                 /*
 130                  * If the message in mailbox is not what we want, we need to
 131                  * clear the mailbox by reading its contents.
 132                  */
 133                 for (i = 0; i < mbox_size; i++)
 134                         if (cdns_mhdp_mailbox_read(mhdp) < 0)
 135                                 break;
 136
 137                 return -EINVAL;
 138         }
 139
 140         return 0;
 141 }
 142
 143 static int cdns_mhdp_mailbox_recv_data(struct cdns_mhdp_device *mhdp,
 144                                        u8 *buff, u16 buff_size)
 145 {
 146         u32 i;
 147         int ret;
 148
 149         for (i = 0; i < buff_size; i++) {
 150                 ret = cdns_mhdp_mailbox_read(mhdp);
 151                 if (ret < 0)
 152                         return ret;
 153
 154                 buff[i] = ret;
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int cdns_mhdp_mailbox_send(struct cdns_mhdp_device *mhdp, u8 module_id,
 161                                   u8 opcode, u16 size, u8 *message)
 162 {
 163         u8 header[4];
 164         int ret, i;
 165
 166         header[0] = opcode;
 167         header[1] = module_id;
 168         put_unaligned_be16(size, header + 2);
 169
 170         for (i = 0; i < sizeof(header); i++) {
 171                 ret = cdns_mhdp_mailbox_write(mhdp, header[i]);
 172                 if (ret)
 173                         return ret;
 174         }
 175
 176         for (i = 0; i < size; i++) {
 177                 ret = cdns_mhdp_mailbox_write(mhdp, message[i]);
 178                 if (ret)
 179                         return ret;
 180         }
 181
 182         return 0;
 183 }
 184
 185 static
 186 int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value)
 187 {
 188         u8 msg[4], resp[8];
 189         int ret;
 190
 191         put_unaligned_be32(addr, msg);
 192
 193         mutex_lock(&mhdp->mbox_mutex);
 194
 195         ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_GENERAL,
 196                                      GENERAL_REGISTER_READ,
 197                                      sizeof(msg), msg);
 198         if (ret)
 199                 goto out;
 200
 201         ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_GENERAL,
 202                                             GENERAL_REGISTER_READ,
 203                                             sizeof(resp));
 204         if (ret)
 205                 goto out;
 206
 207         ret = cdns_mhdp_mailbox_recv_data(mhdp, resp, sizeof(resp));
 208         if (ret)
 209                 goto out;
 210
 211         /* Returned address value should be the same as requested */
 212         if (memcmp(msg, resp, sizeof(msg))) {
 213                 ret = -EINVAL;
 214                 goto out;
 215         }
 216
 217         *value = get_unaligned_be32(resp + 4);
 218
 219 out:
 220         mutex_unlock(&mhdp->mbox_mutex);
 221         if (ret) {
 222                 dev_err(mhdp->dev, "Failed to read register\n");
 223                 *value = 0;
 224         }
 225
 226         return ret;
 227 }
 228
 229 static
 230 int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val)
 231 {
 232         u8 msg[6];
 233         int ret;
 234
 235         put_unaligned_be16(addr, msg);
 236         put_unaligned_be32(val, msg + 2);
 237
 238         mutex_lock(&mhdp->mbox_mutex);
 239
 240         ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
 241                                      DPTX_WRITE_REGISTER, sizeof(msg), msg);
 242
 243         mutex_unlock(&mhdp->mbox_mutex);
 244
 245         return ret;
 246 }
 247
 248 static
 249 int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr,
 250                             u8 start_bit, u8 bits_no, u32 val)
 251 {
 252         u8 field[8];
 253         int ret;
 254
 255         put_unaligned_be16(addr, field);
 256         field[2] = start_bit;
 257         field[3] = bits_no;
 258         put_unaligned_be32(val, field + 4);
 259
 260         mutex_lock(&mhdp->mbox_mutex);
 261
 262         ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
 263                                      DPTX_WRITE_FIELD, sizeof(field), field);
 264
 265         mutex_unlock(&mhdp->mbox_mutex);
 266
 267         return ret;
 268 }
 269
 270 static
 271 int cdns_mhdp_dpcd_read(struct cdns_mhdp_device *mhdp,
 272                         u32 addr, u8 *data, u16 len)
 273 {
 274         u8 msg[5], reg[5];
 275         int ret;
 276
 277         put_unaligned_be16(len, msg);
 278         put_unaligned_be24(addr, msg + 2);
 279
 280         mutex_lock(&mhdp->mbox_mutex);
 281
 282         ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
 283                                      DPTX_READ_DPCD, sizeof(msg), msg);
 284         if (ret)
 285                 goto out;
 286
 287         ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
 288                                             DPTX_READ_DPCD,
 289                                             sizeof(reg) + len);
 290         if (ret)
 291                 goto out;
 292
 293         ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg));
 294         if (ret)
 295                 goto out;
 296
 297         ret = cdns_mhdp_mailbox_recv_data(mhdp, data, len);
 298
 299 out:
 300         mutex_unlock(&mhdp->mbox_mutex);
 301
 302         return ret;
 303 }
 304
 305 static
 306 int cdns_mhdp_dpcd_write(struct cdns_mhdp_device *mhdp, u32 addr, u8 value)
 307 {
 308         u8 msg[6], reg[5];
 309         int ret;
 310
 311         put_unaligned_be16(1, msg);
 312         put_unaligned_be24(addr, msg + 2);
 313         msg[5] = value;
 314
 315         mutex_lock(&mhdp->mbox_mutex);
 316
 317         ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
 318                                      DPTX_WRITE_DPCD, sizeof(msg), msg);
 319         if (ret)
 320                 goto out;
 321
 322         ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
 323                                             DPTX_WRITE_DPCD, sizeof(reg));
 324         if (ret)
 325                 goto out;
 326
 327         ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg));
 328         if (ret)
 329                 goto out;
 330
 331         if (addr != get_unaligned_be24(reg + 2))
 332                 ret = -EINVAL;
 333
 334 out:
 335         mutex_unlock(&mhdp->mbox_mutex);
 336
 337         if (ret)
 338                 dev_err(mhdp->dev, "dpcd write failed: %d\n", ret);
 339         return ret;
 340 }
 341
 342 static
 343 int cdns_mhdp_set_firmware_active(struct cdns_mhdp_device *mhdp, bool enable)
 344 {
 345         u8 msg[5];
 346         int ret, i;
 347
 348         msg[0] = GENERAL_MAIN_CONTROL;
 349         msg[1] = MB_MODULE_ID_GENERAL;
 350         msg[2] = 0;
 351         msg[3] = 1;
 352         msg[4] = enable ? FW_ACTIVE : FW_STANDBY;
 353
 354         mutex_lock(&mhdp->mbox_mutex);
 355
 356         for (i = 0; i < sizeof(msg); i++) {
 357                 ret = cdns_mhdp_mailbox_write(mhdp, msg[i]);
 358                 if (ret)
 359                         goto out;
 360         }
 361
 362         /* read the firmware state */
 363         ret = cdns_mhdp_mailbox_recv_data(mhdp, msg, sizeof(msg));
 364         if (ret)
 365                 goto out;
 366
 367         ret = 0;
 368
 369 out:
 370         mutex_unlock(&mhdp->mbox_mutex);
 371
 372         if (ret < 0)
 373                 dev_err(mhdp->dev, "set firmware active failed\n");
 374         return ret;
 375 }
 376
 377 static
 378 int cdns_mhdp_get_hpd_status(struct cdns_mhdp_device *mhdp)
 379 {
 380         u8 status;
 381         int ret;
 382
 383         mutex_lock(&mhdp->mbox_mutex);
 384
 385         ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
 386                                      DPTX_HPD_STATE, 0, NULL);
 387         if (ret)
 388                 goto err_get_hpd;
 389
 390         ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
 391                                             DPTX_HPD_STATE,
 392                                             sizeof(status));
 393         if (ret)
 394                 goto err_get_hpd;
 395
 396         ret = cdns_mhdp_mailbox_recv_data(mhdp, &status, sizeof(status));
 397         if (ret)
 398                 goto err_get_hpd;
 399
 400         mutex_unlock(&mhdp->mbox_mutex);
 401
 402         dev_dbg(mhdp->dev, "%s: HPD %splugged\n", __func__,
 403                 status ? "" : "un");
 404
 405         return status;
 406
 407 err_get_hpd:
 408         mutex_unlock(&mhdp->mbox_mutex);
 409
 410         return ret;
 411 }
 412
 413 static
 414 int cdns_mhdp_get_edid_block(void *data, u8 *edid,
 415                              unsigned int block, size_t length)
 416 {
 417         struct cdns_mhdp_device *mhdp = data;
 418         u8 msg[2], reg[2], i;
 419         int ret;
 420
 421         mutex_lock(&mhdp->mbox_mutex);
 422
 423         for (i = 0; i < 4; i++) {
 424                 msg[0] = block / 2;
 425                 msg[1] = block % 2;
 426
 427                 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
 428                                              DPTX_GET_EDID, sizeof(msg), msg);
 429                 if (ret)
 430                         continue;
 431
 432                 ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
 433                                                     DPTX_GET_EDID,
 434                                                     sizeof(reg) + length);
 435                 if (ret)
 436                         continue;
 437
 438                 ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg));
 439                 if (ret)
 440                         continue;
 441
 442                 ret = cdns_mhdp_mailbox_recv_data(mhdp, edid, length);
 443                 if (ret)
 444                         continue;
 445
 446                 if (reg[0] == length && reg[1] == block / 2)
 447                         break;
 448         }
 449
 450         mutex_unlock(&mhdp->mbox_mutex);
 451
 452         if (ret)
 453                 dev_err(mhdp->dev, "get block[%d] edid failed: %d\n",
 454                         block, ret);
 455
 456         return ret;
 457 }
 458
 459 static
 460 int cdns_mhdp_read_hpd_event(struct cdns_mhdp_device *mhdp)
 461 {
 462         u8 event = 0;
 463         int ret;
 464
 465         mutex_lock(&mhdp->mbox_mutex);
 466
 467         ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
 468                                      DPTX_READ_EVENT, 0, NULL);
 469         if (ret)
 470                 goto out;
 471
 472         ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
 473                                             DPTX_READ_EVENT, sizeof(event));
 474         if (ret < 0)
 475                 goto out;
 476
 477         ret = cdns_mhdp_mailbox_recv_data(mhdp, &event, sizeof(event));
 478 out:
 479         mutex_unlock(&mhdp->mbox_mutex);
 480
 481         if (ret < 0)
 482                 return ret;
 483
 484         dev_dbg(mhdp->dev, "%s: %s%s%s%s\n", __func__,
 485                 (event & DPTX_READ_EVENT_HPD_TO_HIGH) ? "TO_HIGH " : "",
 486                 (event & DPTX_READ_EVENT_HPD_TO_LOW) ? "TO_LOW " : "",
 487                 (event & DPTX_READ_EVENT_HPD_PULSE) ? "PULSE " : "",
 488                 (event & DPTX_READ_EVENT_HPD_STATE) ? "HPD_STATE " : "");
 489
 490         return event;
 491 }
 492
 493 static
 494 int cdns_mhdp_adjust_lt(struct cdns_mhdp_device *mhdp, unsigned int nlanes,
 495                         unsigned int udelay, const u8 *lanes_data,
 496                         u8 link_status[DP_LINK_STATUS_SIZE])
 497 {
 498         u8 payload[7];
 499         u8 hdr[5]; /* For DPCD read response header */
 500         u32 addr;
 501         int ret;
 502
 503         if (nlanes != 4 && nlanes != 2 && nlanes != 1) {
 504                 dev_err(mhdp->dev, "invalid number of lanes: %u\n", nlanes);
 505                 ret = -EINVAL;
 506                 goto out;
 507         }
 508
 509         payload[0] = nlanes;
 510         put_unaligned_be16(udelay, payload + 1);
 511         memcpy(payload + 3, lanes_data, nlanes);
 512
 513         mutex_lock(&mhdp->mbox_mutex);
 514
 515         ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
 516                                      DPTX_ADJUST_LT,
 517                                      sizeof(payload), payload);
 518         if (ret)
 519                 goto out;
 520
 521         /* Yes, read the DPCD read command response */
 522         ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
 523                                             DPTX_READ_DPCD,
 524                                             sizeof(hdr) + DP_LINK_STATUS_SIZE);
 525         if (ret)
 526                 goto out;
 527
 528         ret = cdns_mhdp_mailbox_recv_data(mhdp, hdr, sizeof(hdr));
 529         if (ret)
 530                 goto out;
 531
 532         addr = get_unaligned_be24(hdr + 2);
 533         if (addr != DP_LANE0_1_STATUS)
 534                 goto out;
 535
 536         ret = cdns_mhdp_mailbox_recv_data(mhdp, link_status,
 537                                           DP_LINK_STATUS_SIZE);
 538
 539 out:
 540         mutex_unlock(&mhdp->mbox_mutex);
 541
 542         if (ret)
 543                 dev_err(mhdp->dev, "Failed to adjust Link Training.\n");
 544
 545         return ret;
 546 }
 547
 548 /**
 549  * cdns_mhdp_link_power_up() - power up a DisplayPort link
 550  * @aux: DisplayPort AUX channel
 551  * @link: pointer to a structure containing the link configuration
 552  *
 553  * Returns 0 on success or a negative error code on failure.
 554  */
 555 static
 556 int cdns_mhdp_link_power_up(struct drm_dp_aux *aux, struct cdns_mhdp_link *link)
 557 {
 558         u8 value;
 559         int err;
 560
 561         /* DP_SET_POWER register is only available on DPCD v1.1 and later */
 562         if (link->revision < 0x11)
 563                 return 0;
 564
 565         err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
 566         if (err < 0)
 567                 return err;
 568
 569         value &= ~DP_SET_POWER_MASK;
 570         value |= DP_SET_POWER_D0;
 571
 572         err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
 573         if (err < 0)
 574                 return err;
 575
 576         /*
 577          * According to the DP 1.1 specification, a "Sink Device must exit the
 578          * power saving state within 1 ms" (Section 2.5.3.1, Table 5-52, "Sink
 579          * Control Field" (register 0x600).
 580          */
 581         usleep_range(1000, 2000);
 582
 583         return 0;
 584 }
 585
 586 /**
 587  * cdns_mhdp_link_power_down() - power down a DisplayPort link
 588  * @aux: DisplayPort AUX channel
 589  * @link: pointer to a structure containing the link configuration
 590  *
 591  * Returns 0 on success or a negative error code on failure.
 592  */
 593 static
 594 int cdns_mhdp_link_power_down(struct drm_dp_aux *aux,
 595                               struct cdns_mhdp_link *link)
 596 {
 597         u8 value;
 598         int err;
 599
 600         /* DP_SET_POWER register is only available on DPCD v1.1 and later */
 601         if (link->revision < 0x11)
 602                 return 0;
 603
 604         err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
 605         if (err < 0)
 606                 return err;
 607
 608         value &= ~DP_SET_POWER_MASK;
 609         value |= DP_SET_POWER_D3;
 610
 611         err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
 612         if (err < 0)
 613                 return err;
 614
 615         return 0;
 616 }
 617
 618 /**
 619  * cdns_mhdp_link_configure() - configure a DisplayPort link
 620  * @aux: DisplayPort AUX channel
 621  * @link: pointer to a structure containing the link configuration
 622  *
 623  * Returns 0 on success or a negative error code on failure.
 624  */
 625 static
 626 int cdns_mhdp_link_configure(struct drm_dp_aux *aux,
 627                              struct cdns_mhdp_link *link)
 628 {
 629         u8 values[2];
 630         int err;
 631
 632         values[0] = drm_dp_link_rate_to_bw_code(link->rate);
 633         values[1] = link->num_lanes;
 634
 635         if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
 636                 values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 637
 638         err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));
 639         if (err < 0)
 640                 return err;
 641
 642         return 0;
 643 }
 644
 645 static unsigned int cdns_mhdp_max_link_rate(struct cdns_mhdp_device *mhdp)
 646 {
 647         return min(mhdp->host.link_rate, mhdp->sink.link_rate);
 648 }
 649
 650 static u8 cdns_mhdp_max_num_lanes(struct cdns_mhdp_device *mhdp)
 651 {
 652         return min(mhdp->sink.lanes_cnt, mhdp->host.lanes_cnt);
 653 }
 654
 655 static u8 cdns_mhdp_eq_training_pattern_supported(struct cdns_mhdp_device *mhdp)
 656 {
 657         return fls(mhdp->host.pattern_supp & mhdp->sink.pattern_supp);
 658 }
 659
 660 static bool cdns_mhdp_get_ssc_supported(struct cdns_mhdp_device *mhdp)
 661 {
 662         /* Check if SSC is supported by both sides */
 663         return mhdp->host.ssc && mhdp->sink.ssc;
 664 }
 665
 666 static enum drm_connector_status cdns_mhdp_detect(struct cdns_mhdp_device *mhdp)
 667 {
 668         dev_dbg(mhdp->dev, "%s: %d\n", __func__, mhdp->plugged);
 669
 670         if (mhdp->plugged)
 671                 return connector_status_connected;
 672         else
 673                 return connector_status_disconnected;
 674 }
 675
 676 static int cdns_mhdp_check_fw_version(struct cdns_mhdp_device *mhdp)
 677 {
 678         u32 major_num, minor_num, revision;
 679         u32 fw_ver, lib_ver;
 680
 681         fw_ver = (readl(mhdp->regs + CDNS_VER_H) << 8)
 682                | readl(mhdp->regs + CDNS_VER_L);
 683
 684         lib_ver = (readl(mhdp->regs + CDNS_LIB_H_ADDR) << 8)
 685                 | readl(mhdp->regs + CDNS_LIB_L_ADDR);
 686
 687         if (lib_ver < 33984) {
 688                 /*
 689                  * Older FW versions with major number 1, used to store FW
 690                  * version information by storing repository revision number
 691                  * in registers. This is for identifying these FW versions.
 692                  */
 693                 major_num = 1;
 694                 minor_num = 2;
 695                 if (fw_ver == 26098) {
 696                         revision = 15;
 697                 } else if (lib_ver == 0 && fw_ver == 0) {
 698                         revision = 17;
 699                 } else {
 700                         dev_err(mhdp->dev, "Unsupported FW version: fw_ver = %u, lib_ver = %u\n",
 701                                 fw_ver, lib_ver);
 702                         return -ENODEV;
 703                 }
 704         } else {
 705                 /* To identify newer FW versions with major number 2 onwards. */
 706                 major_num = fw_ver / 10000;
 707                 minor_num = (fw_ver / 100) % 100;
 708                 revision = (fw_ver % 10000) % 100;
 709         }
 710
 711         dev_dbg(mhdp->dev, "FW version: v%u.%u.%u\n", major_num, minor_num,
 712                 revision);
 713         return 0;
 714 }
 715
 716 static int cdns_mhdp_fw_activate(const struct firmware *fw,
 717                                  struct cdns_mhdp_device *mhdp)
 718 {
 719         unsigned int reg;
 720         int ret;
 721
 722         /* Release uCPU reset and stall it. */
 723         writel(CDNS_CPU_STALL, mhdp->regs + CDNS_APB_CTRL);
 724
 725         memcpy_toio(mhdp->regs + CDNS_MHDP_IMEM, fw->data, fw->size);
 726
 727         /* Leave debug mode, release stall */
 728         writel(0, mhdp->regs + CDNS_APB_CTRL);
 729
 730         /*
 731          * Wait for the KEEP_ALIVE "message" on the first 8 bits.
 732          * Updated each sched "tick" (~2ms)
 733          */
 734         ret = readl_poll_timeout(mhdp->regs + CDNS_KEEP_ALIVE, reg,
 735                                  reg & CDNS_KEEP_ALIVE_MASK, 500,
 736                                  CDNS_KEEP_ALIVE_TIMEOUT);
 737         if (ret) {
 738                 dev_err(mhdp->dev,
 739                         "device didn't give any life sign: reg %d\n", reg);
 740                 return ret;
 741         }
 742
 743         ret = cdns_mhdp_check_fw_version(mhdp);
 744         if (ret)
 745                 return ret;
 746
 747         /* Init events to 0 as it's not cleared by FW at boot but on read */
 748         readl(mhdp->regs + CDNS_SW_EVENT0);
 749         readl(mhdp->regs + CDNS_SW_EVENT1);
 750         readl(mhdp->regs + CDNS_SW_EVENT2);
 751         readl(mhdp->regs + CDNS_SW_EVENT3);
 752
 753         /* Activate uCPU */
 754         ret = cdns_mhdp_set_firmware_active(mhdp, true);
 755         if (ret)
 756                 return ret;
 757
 758         spin_lock(&mhdp->start_lock);
 759
 760         mhdp->hw_state = MHDP_HW_READY;
 761
 762         /*
 763          * Here we must keep the lock while enabling the interrupts
 764          * since it would otherwise be possible that interrupt enable
 765          * code is executed after the bridge is detached. The similar
 766          * situation is not possible in attach()/detach() callbacks
 767          * since the hw_state changes from MHDP_HW_READY to
 768          * MHDP_HW_STOPPED happens only due to driver removal when
 769          * bridge should already be detached.
 770          */
 771         cdns_mhdp_bridge_hpd_enable(&mhdp->bridge);
 772
 773         spin_unlock(&mhdp->start_lock);
 774
 775         wake_up(&mhdp->fw_load_wq);
 776         dev_dbg(mhdp->dev, "DP FW activated\n");
 777
 778         return 0;
 779 }
 780
 781 static void cdns_mhdp_fw_cb(const struct firmware *fw, void *context)
 782 {
 783         struct cdns_mhdp_device *mhdp = context;
 784         bool bridge_attached;
 785         int ret;
 786
 787         dev_dbg(mhdp->dev, "firmware callback\n");
 788
 789         if (!fw || !fw->data) {
 790                 dev_err(mhdp->dev, "%s: No firmware.\n", __func__);
 791                 return;
 792         }
 793
 794         ret = cdns_mhdp_fw_activate(fw, mhdp);
 795
 796         release_firmware(fw);
 797
 798         if (ret)
 799                 return;
 800
 801         /*
 802          *  XXX how to make sure the bridge is still attached when
 803          *      calling drm_kms_helper_hotplug_event() after releasing
 804          *      the lock? We should not hold the spin lock when
 805          *      calling drm_kms_helper_hotplug_event() since it may
 806          *      cause a dead lock. FB-dev console calls detect from the
 807          *      same thread just down the call stack started here.
 808          */
 809         spin_lock(&mhdp->start_lock);
 810         bridge_attached = mhdp->bridge_attached;
 811         spin_unlock(&mhdp->start_lock);
 812         if (bridge_attached) {
 813                 if (mhdp->connector.dev)
 814                         drm_kms_helper_hotplug_event(mhdp->bridge.dev);
 815                 else
 816                         drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp));
 817         }
 818 }
 819
 820 static int cdns_mhdp_load_firmware(struct cdns_mhdp_device *mhdp)
 821 {
 822         int ret;
 823
 824         ret = request_firmware_nowait(THIS_MODULE, true, FW_NAME, mhdp->dev,
 825                                       GFP_KERNEL, mhdp, cdns_mhdp_fw_cb);
 826         if (ret) {
 827                 dev_err(mhdp->dev, "failed to load firmware (%s), ret: %d\n",
 828                         FW_NAME, ret);
 829                 return ret;
 830         }
 831
 832         return 0;
 833 }
 834
 835 static ssize_t cdns_mhdp_transfer(struct drm_dp_aux *aux,
 836                                   struct drm_dp_aux_msg *msg)
 837 {
 838         struct cdns_mhdp_device *mhdp = dev_get_drvdata(aux->dev);
 839         int ret;
 840
 841         if (msg->request != DP_AUX_NATIVE_WRITE &&
 842             msg->request != DP_AUX_NATIVE_READ)
 843                 return -EOPNOTSUPP;
 844
 845         if (msg->request == DP_AUX_NATIVE_WRITE) {
 846                 const u8 *buf = msg->buffer;
 847                 unsigned int i;
 848
 849                 for (i = 0; i < msg->size; ++i) {
 850                         ret = cdns_mhdp_dpcd_write(mhdp,
 851                                                    msg->address + i, buf[i]);
 852                         if (!ret)
 853                                 continue;
 854
 855                         dev_err(mhdp->dev,
 856                                 "Failed to write DPCD addr %u\n",
 857                                 msg->address + i);
 858
 859                         return ret;
 860                 }
 861         } else {
 862                 ret = cdns_mhdp_dpcd_read(mhdp, msg->address,
 863                                           msg->buffer, msg->size);
 864                 if (ret) {
 865                         dev_err(mhdp->dev,
 866                                 "Failed to read DPCD addr %u\n",
 867                                 msg->address);
 868
 869                         return ret;
 870                 }
 871         }
 872
 873         return msg->size;
 874 }
 875
 876 static int cdns_mhdp_link_training_init(struct cdns_mhdp_device *mhdp)
 877 {
 878         union phy_configure_opts phy_cfg;
 879         u32 reg32;
 880         int ret;
 881
 882         drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
 883                            DP_TRAINING_PATTERN_DISABLE);
 884
 885         /* Reset PHY configuration */
 886         reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1);
 887         if (!mhdp->host.scrambler)
 888                 reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
 889
 890         cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
 891
 892         cdns_mhdp_reg_write(mhdp, CDNS_DP_ENHNCD,
 893                             mhdp->sink.enhanced & mhdp->host.enhanced);
 894
 895         cdns_mhdp_reg_write(mhdp, CDNS_DP_LANE_EN,
 896                             CDNS_DP_LANE_EN_LANES(mhdp->link.num_lanes));
 897
 898         cdns_mhdp_link_configure(&mhdp->aux, &mhdp->link);
 899         phy_cfg.dp.link_rate = mhdp->link.rate / 100;
 900         phy_cfg.dp.lanes = mhdp->link.num_lanes;
 901
 902         memset(phy_cfg.dp.voltage, 0, sizeof(phy_cfg.dp.voltage));
 903         memset(phy_cfg.dp.pre, 0, sizeof(phy_cfg.dp.pre));
 904
 905         phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp);
 906         phy_cfg.dp.set_lanes = true;
 907         phy_cfg.dp.set_rate = true;
 908         phy_cfg.dp.set_voltages = true;
 909         ret = phy_configure(mhdp->phy,  &phy_cfg);
 910         if (ret) {
 911                 dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n",
 912                         __func__, ret);
 913                 return ret;
 914         }
 915
 916         cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG,
 917                             CDNS_PHY_COMMON_CONFIG |
 918                             CDNS_PHY_TRAINING_EN |
 919                             CDNS_PHY_TRAINING_TYPE(1) |
 920                             CDNS_PHY_SCRAMBLER_BYPASS);
 921
 922         drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
 923                            DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE);
 924
 925         return 0;
 926 }
 927
 928 static void cdns_mhdp_get_adjust_train(struct cdns_mhdp_device *mhdp,
 929                                        u8 link_status[DP_LINK_STATUS_SIZE],
 930                                        u8 lanes_data[CDNS_DP_MAX_NUM_LANES],
 931                                        union phy_configure_opts *phy_cfg)
 932 {
 933         u8 adjust, max_pre_emph, max_volt_swing;
 934         u8 set_volt, set_pre;
 935         unsigned int i;
 936
 937         max_pre_emph = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis)
 938                            << DP_TRAIN_PRE_EMPHASIS_SHIFT;
 939         max_volt_swing = CDNS_VOLT_SWING(mhdp->host.volt_swing);
 940
 941         for (i = 0; i < mhdp->link.num_lanes; i++) {
 942                 /* Check if Voltage swing and pre-emphasis are within limits */
 943                 adjust = drm_dp_get_adjust_request_voltage(link_status, i);
 944                 set_volt = min(adjust, max_volt_swing);
 945
 946                 adjust = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
 947                 set_pre = min(adjust, max_pre_emph)
 948                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
 949
 950                 /*
 951                  * Voltage swing level and pre-emphasis level combination is
 952                  * not allowed: leaving pre-emphasis as-is, and adjusting
 953                  * voltage swing.
 954                  */
 955                 if (set_volt + set_pre > 3)
 956                         set_volt = 3 - set_pre;
 957
 958                 phy_cfg->dp.voltage[i] = set_volt;
 959                 lanes_data[i] = set_volt;
 960
 961                 if (set_volt == max_volt_swing)
 962                         lanes_data[i] |= DP_TRAIN_MAX_SWING_REACHED;
 963
 964                 phy_cfg->dp.pre[i] = set_pre;
 965                 lanes_data[i] |= (set_pre << DP_TRAIN_PRE_EMPHASIS_SHIFT);
 966
 967                 if (set_pre == (max_pre_emph >> DP_TRAIN_PRE_EMPHASIS_SHIFT))
 968                         lanes_data[i] |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 969         }
 970 }
 971
 972 static
 973 void cdns_mhdp_set_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE],
 974                                           unsigned int lane, u8 volt)
 975 {
 976         unsigned int s = ((lane & 1) ?
 977                           DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
 978                           DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
 979         unsigned int idx = DP_ADJUST_REQUEST_LANE0_1 - DP_LANE0_1_STATUS + (lane >> 1);
 980
 981         link_status[idx] &= ~(DP_ADJUST_VOLTAGE_SWING_LANE0_MASK << s);
 982         link_status[idx] |= volt << s;
 983 }
 984
 985 static
 986 void cdns_mhdp_set_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE],
 987                                                unsigned int lane, u8 pre_emphasis)
 988 {
 989         unsigned int s = ((lane & 1) ?
 990                           DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
 991                           DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
 992         unsigned int idx = DP_ADJUST_REQUEST_LANE0_1 - DP_LANE0_1_STATUS + (lane >> 1);
 993
 994         link_status[idx] &= ~(DP_ADJUST_PRE_EMPHASIS_LANE0_MASK << s);
 995         link_status[idx] |= pre_emphasis << s;
 996 }
 997
 998 static void cdns_mhdp_adjust_requested_eq(struct cdns_mhdp_device *mhdp,
 999                                           u8 link_status[DP_LINK_STATUS_SIZE])
1000 {
1001         u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis);
1002         u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing);
1003         unsigned int i;
1004         u8 volt, pre;
1005
1006         for (i = 0; i < mhdp->link.num_lanes; i++) {
1007                 volt = drm_dp_get_adjust_request_voltage(link_status, i);
1008                 pre = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
1009                 if (volt + pre > 3)
1010                         cdns_mhdp_set_adjust_request_voltage(link_status, i,
1011                                                              3 - pre);
1012                 if (mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING)
1013                         cdns_mhdp_set_adjust_request_voltage(link_status, i,
1014                                                              max_volt);
1015                 if (mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS)
1016                         cdns_mhdp_set_adjust_request_pre_emphasis(link_status,
1017                                                                   i, max_pre);
1018         }
1019 }
1020
1021 static void cdns_mhdp_print_lt_status(const char *prefix,
1022                                       struct cdns_mhdp_device *mhdp,
1023                                       union phy_configure_opts *phy_cfg)
1024 {
1025         char vs[8] = "0/0/0/0";
1026         char pe[8] = "0/0/0/0";
1027         unsigned int i;
1028
1029         for (i = 0; i < mhdp->link.num_lanes; i++) {
1030                 vs[i * 2] = '0' + phy_cfg->dp.voltage[i];
1031                 pe[i * 2] = '0' + phy_cfg->dp.pre[i];
1032         }
1033
1034         vs[i * 2 - 1] = '\0';
1035         pe[i * 2 - 1] = '\0';
1036
1037         dev_dbg(mhdp->dev, "%s, %u lanes, %u Mbps, vs %s, pe %s\n",
1038                 prefix,
1039                 mhdp->link.num_lanes, mhdp->link.rate / 100,
1040                 vs, pe);
1041 }
1042
1043 static bool cdns_mhdp_link_training_channel_eq(struct cdns_mhdp_device *mhdp,
1044                                                u8 eq_tps,
1045                                                unsigned int training_interval)
1046 {
1047         u8 lanes_data[CDNS_DP_MAX_NUM_LANES], fail_counter_short = 0;
1048         u8 link_status[DP_LINK_STATUS_SIZE];
1049         union phy_configure_opts phy_cfg;
1050         u32 reg32;
1051         int ret;
1052         bool r;
1053
1054         dev_dbg(mhdp->dev, "Starting EQ phase\n");
1055
1056         /* Enable link training TPS[eq_tps] in PHY */
1057         reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_EN |
1058                 CDNS_PHY_TRAINING_TYPE(eq_tps);
1059         if (eq_tps != 4)
1060                 reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
1061         cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
1062
1063         drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
1064                            (eq_tps != 4) ? eq_tps | DP_LINK_SCRAMBLING_DISABLE :
1065                            CDNS_DP_TRAINING_PATTERN_4);
1066
1067         drm_dp_dpcd_read_link_status(&mhdp->aux, link_status);
1068
1069         do {
1070                 cdns_mhdp_get_adjust_train(mhdp, link_status, lanes_data,
1071                                            &phy_cfg);
1072                 phy_cfg.dp.lanes = mhdp->link.num_lanes;
1073                 phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp);
1074                 phy_cfg.dp.set_lanes = false;
1075                 phy_cfg.dp.set_rate = false;
1076                 phy_cfg.dp.set_voltages = true;
1077                 ret = phy_configure(mhdp->phy,  &phy_cfg);
1078                 if (ret) {
1079                         dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n",
1080                                 __func__, ret);
1081                         goto err;
1082                 }
1083
1084                 cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes,
1085                                     training_interval, lanes_data, link_status);
1086
1087                 r = drm_dp_clock_recovery_ok(link_status, mhdp->link.num_lanes);
1088                 if (!r)
1089                         goto err;
1090
1091                 if (drm_dp_channel_eq_ok(link_status, mhdp->link.num_lanes)) {
1092                         cdns_mhdp_print_lt_status("EQ phase ok", mhdp,
1093                                                   &phy_cfg);
1094                         return true;
1095                 }
1096
1097                 fail_counter_short++;
1098
1099                 cdns_mhdp_adjust_requested_eq(mhdp, link_status);
1100         } while (fail_counter_short < 5);
1101
1102 err:
1103         cdns_mhdp_print_lt_status("EQ phase failed", mhdp, &phy_cfg);
1104
1105         return false;
1106 }
1107
1108 static void cdns_mhdp_adjust_requested_cr(struct cdns_mhdp_device *mhdp,
1109                                           u8 link_status[DP_LINK_STATUS_SIZE],
1110                                           u8 *req_volt, u8 *req_pre)
1111 {
1112         const u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing);
1113         const u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis);
1114         unsigned int i;
1115
1116         for (i = 0; i < mhdp->link.num_lanes; i++) {
1117                 u8 val;
1118
1119                 val = mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING ?
1120                       max_volt : req_volt[i];
1121                 cdns_mhdp_set_adjust_request_voltage(link_status, i, val);
1122
1123                 val = mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS ?
1124                       max_pre : req_pre[i];
1125                 cdns_mhdp_set_adjust_request_pre_emphasis(link_status, i, val);
1126         }
1127 }
1128
1129 static
1130 void cdns_mhdp_validate_cr(struct cdns_mhdp_device *mhdp, bool *cr_done,
1131                            bool *same_before_adjust, bool *max_swing_reached,
1132                            u8 before_cr[CDNS_DP_MAX_NUM_LANES],
1133                            u8 after_cr[DP_LINK_STATUS_SIZE], u8 *req_volt,
1134                            u8 *req_pre)
1135 {
1136         const u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing);
1137         const u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis);
1138         bool same_pre, same_volt;
1139         unsigned int i;
1140         u8 adjust;
1141
1142         *same_before_adjust = false;
1143         *max_swing_reached = false;
1144         *cr_done = drm_dp_clock_recovery_ok(after_cr, mhdp->link.num_lanes);
1145
1146         for (i = 0; i < mhdp->link.num_lanes; i++) {
1147                 adjust = drm_dp_get_adjust_request_voltage(after_cr, i);
1148                 req_volt[i] = min(adjust, max_volt);
1149
1150                 adjust = drm_dp_get_adjust_request_pre_emphasis(after_cr, i) >>
1151                       DP_TRAIN_PRE_EMPHASIS_SHIFT;
1152                 req_pre[i] = min(adjust, max_pre);
1153
1154                 same_pre = (before_cr[i] & DP_TRAIN_PRE_EMPHASIS_MASK) ==
1155                            req_pre[i] << DP_TRAIN_PRE_EMPHASIS_SHIFT;
1156                 same_volt = (before_cr[i] & DP_TRAIN_VOLTAGE_SWING_MASK) ==
1157                             req_volt[i];
1158                 if (same_pre && same_volt)
1159                         *same_before_adjust = true;
1160
1161                 /* 3.1.5.2 in DP Standard v1.4. Table 3-1 */
1162                 if (!*cr_done && req_volt[i] + req_pre[i] >= 3) {
1163                         *max_swing_reached = true;
1164                         return;
1165                 }
1166         }
1167 }
1168
1169 static bool cdns_mhdp_link_training_cr(struct cdns_mhdp_device *mhdp)
1170 {
1171         u8 lanes_data[CDNS_DP_MAX_NUM_LANES],
1172         fail_counter_short = 0, fail_counter_cr_long = 0;
1173         u8 link_status[DP_LINK_STATUS_SIZE];
1174         bool cr_done;
1175         union phy_configure_opts phy_cfg;
1176         int ret;
1177
1178         dev_dbg(mhdp->dev, "Starting CR phase\n");
1179
1180         ret = cdns_mhdp_link_training_init(mhdp);
1181         if (ret)
1182                 goto err;
1183
1184         drm_dp_dpcd_read_link_status(&mhdp->aux, link_status);
1185
1186         do {
1187                 u8 requested_adjust_volt_swing[CDNS_DP_MAX_NUM_LANES] = {};
1188                 u8 requested_adjust_pre_emphasis[CDNS_DP_MAX_NUM_LANES] = {};
1189                 bool same_before_adjust, max_swing_reached;
1190
1191                 cdns_mhdp_get_adjust_train(mhdp, link_status, lanes_data,
1192                                            &phy_cfg);
1193                 phy_cfg.dp.lanes = mhdp->link.num_lanes;
1194                 phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp);
1195                 phy_cfg.dp.set_lanes = false;
1196                 phy_cfg.dp.set_rate = false;
1197                 phy_cfg.dp.set_voltages = true;
1198                 ret = phy_configure(mhdp->phy,  &phy_cfg);
1199                 if (ret) {
1200                         dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n",
1201                                 __func__, ret);
1202                         goto err;
1203                 }
1204
1205                 cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes, 100,
1206                                     lanes_data, link_status);
1207
1208                 cdns_mhdp_validate_cr(mhdp, &cr_done, &same_before_adjust,
1209                                       &max_swing_reached, lanes_data,
1210                                       link_status,
1211                                       requested_adjust_volt_swing,
1212                                       requested_adjust_pre_emphasis);
1213
1214                 if (max_swing_reached) {
1215                         dev_err(mhdp->dev, "CR: max swing reached\n");
1216                         goto err;
1217                 }
1218
1219                 if (cr_done) {
1220                         cdns_mhdp_print_lt_status("CR phase ok", mhdp,
1221                                                   &phy_cfg);
1222                         return true;
1223                 }
1224
1225                 /* Not all CR_DONE bits set */
1226                 fail_counter_cr_long++;
1227
1228                 if (same_before_adjust) {
1229                         fail_counter_short++;
1230                         continue;
1231                 }
1232
1233                 fail_counter_short = 0;
1234                 /*
1235                  * Voltage swing/pre-emphasis adjust requested
1236                  * during CR phase
1237                  */
1238                 cdns_mhdp_adjust_requested_cr(mhdp, link_status,
1239                                               requested_adjust_volt_swing,
1240                                               requested_adjust_pre_emphasis);
1241         } while (fail_counter_short < 5 && fail_counter_cr_long < 10);
1242
1243 err:
1244         cdns_mhdp_print_lt_status("CR phase failed", mhdp, &phy_cfg);
1245
1246         return false;
1247 }
1248
1249 static void cdns_mhdp_lower_link_rate(struct cdns_mhdp_link *link)
1250 {
1251         switch (drm_dp_link_rate_to_bw_code(link->rate)) {
1252         case DP_LINK_BW_2_7:
1253                 link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_1_62);
1254                 break;
1255         case DP_LINK_BW_5_4:
1256                 link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_2_7);
1257                 break;
1258         case DP_LINK_BW_8_1:
1259                 link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4);
1260                 break;
1261         }
1262 }
1263
1264 static int cdns_mhdp_link_training(struct cdns_mhdp_device *mhdp,
1265                                    unsigned int training_interval)
1266 {
1267         u32 reg32;
1268         const u8 eq_tps = cdns_mhdp_eq_training_pattern_supported(mhdp);
1269         int ret;
1270
1271         while (1) {
1272                 if (!cdns_mhdp_link_training_cr(mhdp)) {
1273                         if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) !=
1274                             DP_LINK_BW_1_62) {
1275                                 dev_dbg(mhdp->dev,
1276                                         "Reducing link rate during CR phase\n");
1277                                 cdns_mhdp_lower_link_rate(&mhdp->link);
1278
1279                                 continue;
1280                         } else if (mhdp->link.num_lanes > 1) {
1281                                 dev_dbg(mhdp->dev,
1282                                         "Reducing lanes number during CR phase\n");
1283                                 mhdp->link.num_lanes >>= 1;
1284                                 mhdp->link.rate = cdns_mhdp_max_link_rate(mhdp);
1285
1286                                 continue;
1287                         }
1288
1289                         dev_err(mhdp->dev,
1290                                 "Link training failed during CR phase\n");
1291                         goto err;
1292                 }
1293
1294                 if (cdns_mhdp_link_training_channel_eq(mhdp, eq_tps,
1295                                                        training_interval))
1296                         break;
1297
1298                 if (mhdp->link.num_lanes > 1) {
1299                         dev_dbg(mhdp->dev,
1300                                 "Reducing lanes number during EQ phase\n");
1301                         mhdp->link.num_lanes >>= 1;
1302
1303                         continue;
1304                 } else if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) !=
1305                            DP_LINK_BW_1_62) {
1306                         dev_dbg(mhdp->dev,
1307                                 "Reducing link rate during EQ phase\n");
1308                         cdns_mhdp_lower_link_rate(&mhdp->link);
1309                         mhdp->link.num_lanes = cdns_mhdp_max_num_lanes(mhdp);
1310
1311                         continue;
1312                 }
1313
1314                 dev_err(mhdp->dev, "Link training failed during EQ phase\n");
1315                 goto err;
1316         }
1317
1318         dev_dbg(mhdp->dev, "Link training ok. Lanes: %u, Rate %u Mbps\n",
1319                 mhdp->link.num_lanes, mhdp->link.rate / 100);
1320
1321         drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
1322                            mhdp->host.scrambler ? 0 :
1323                            DP_LINK_SCRAMBLING_DISABLE);
1324
1325         ret = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &reg32);
1326         if (ret < 0) {
1327                 dev_err(mhdp->dev,
1328                         "Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n",
1329                         ret);
1330                 return ret;
1331         }
1332         reg32 &= ~GENMASK(1, 0);
1333         reg32 |= CDNS_DP_NUM_LANES(mhdp->link.num_lanes);
1334         reg32 |= CDNS_DP_WR_FAILING_EDGE_VSYNC;
1335         reg32 |= CDNS_DP_FRAMER_EN;
1336         cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, reg32);
1337
1338         /* Reset PHY config */
1339         reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1);
1340         if (!mhdp->host.scrambler)
1341                 reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
1342         cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
1343
1344         return 0;
1345 err:
1346         /* Reset PHY config */
1347         reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1);
1348         if (!mhdp->host.scrambler)
1349                 reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
1350         cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
1351
1352         drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
1353                            DP_TRAINING_PATTERN_DISABLE);
1354
1355         return -EIO;
1356 }
1357
1358 static u32 cdns_mhdp_get_training_interval_us(struct cdns_mhdp_device *mhdp,
1359                                               u32 interval)
1360 {
1361         if (interval == 0)
1362                 return 400;
1363         if (interval < 5)
1364                 return 4000 << (interval - 1);
1365         dev_err(mhdp->dev,
1366                 "wrong training interval returned by DPCD: %d\n", interval);
1367         return 0;
1368 }
1369
1370 static void cdns_mhdp_fill_host_caps(struct cdns_mhdp_device *mhdp)
1371 {
1372         unsigned int link_rate;
1373
1374         /* Get source capabilities based on PHY attributes */
1375
1376         mhdp->host.lanes_cnt = mhdp->phy->attrs.bus_width;
1377         if (!mhdp->host.lanes_cnt)
1378                 mhdp->host.lanes_cnt = 4;
1379
1380         link_rate = mhdp->phy->attrs.max_link_rate;
1381         if (!link_rate)
1382                 link_rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_8_1);
1383         else
1384                 /* PHY uses Mb/s, DRM uses tens of kb/s. */
1385                 link_rate *= 100;
1386
1387         mhdp->host.link_rate = link_rate;
1388         mhdp->host.volt_swing = CDNS_VOLT_SWING(3);
1389         mhdp->host.pre_emphasis = CDNS_PRE_EMPHASIS(3);
1390         mhdp->host.pattern_supp = CDNS_SUPPORT_TPS(1) |
1391                                   CDNS_SUPPORT_TPS(2) | CDNS_SUPPORT_TPS(3) |
1392                                   CDNS_SUPPORT_TPS(4);
1393         mhdp->host.lane_mapping = CDNS_LANE_MAPPING_NORMAL;
1394         mhdp->host.fast_link = false;
1395         mhdp->host.enhanced = true;
1396         mhdp->host.scrambler = true;
1397         mhdp->host.ssc = false;
1398 }
1399
1400 static void cdns_mhdp_fill_sink_caps(struct cdns_mhdp_device *mhdp,
1401                                      u8 dpcd[DP_RECEIVER_CAP_SIZE])
1402 {
1403         mhdp->sink.link_rate = mhdp->link.rate;
1404         mhdp->sink.lanes_cnt = mhdp->link.num_lanes;
1405         mhdp->sink.enhanced = !!(mhdp->link.capabilities &
1406                                  DP_LINK_CAP_ENHANCED_FRAMING);
1407
1408         /* Set SSC support */
1409         mhdp->sink.ssc = !!(dpcd[DP_MAX_DOWNSPREAD] &
1410                                   DP_MAX_DOWNSPREAD_0_5);
1411
1412         /* Set TPS support */
1413         mhdp->sink.pattern_supp = CDNS_SUPPORT_TPS(1) | CDNS_SUPPORT_TPS(2);
1414         if (drm_dp_tps3_supported(dpcd))
1415                 mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(3);
1416         if (drm_dp_tps4_supported(dpcd))
1417                 mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(4);
1418
1419         /* Set fast link support */
1420         mhdp->sink.fast_link = !!(dpcd[DP_MAX_DOWNSPREAD] &
1421                                   DP_NO_AUX_HANDSHAKE_LINK_TRAINING);
1422 }
1423
1424 static int cdns_mhdp_link_up(struct cdns_mhdp_device *mhdp)
1425 {
1426         u8 dpcd[DP_RECEIVER_CAP_SIZE], amp[2];
1427         u32 resp, interval, interval_us;
1428         u8 ext_cap_chk = 0;
1429         unsigned int addr;
1430         int err;
1431
1432         WARN_ON(!mutex_is_locked(&mhdp->link_mutex));
1433
1434         drm_dp_dpcd_readb(&mhdp->aux, DP_TRAINING_AUX_RD_INTERVAL,
1435                           &ext_cap_chk);
1436
1437         if (ext_cap_chk & DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT)
1438                 addr = DP_DP13_DPCD_REV;
1439         else
1440                 addr = DP_DPCD_REV;
1441
1442         err = drm_dp_dpcd_read(&mhdp->aux, addr, dpcd, DP_RECEIVER_CAP_SIZE);
1443         if (err < 0) {
1444                 dev_err(mhdp->dev, "Failed to read receiver capabilities\n");
1445                 return err;
1446         }
1447
1448         mhdp->link.revision = dpcd[0];
1449         mhdp->link.rate = drm_dp_bw_code_to_link_rate(dpcd[1]);
1450         mhdp->link.num_lanes = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
1451
1452         if (dpcd[2] & DP_ENHANCED_FRAME_CAP)
1453                 mhdp->link.capabilities |= DP_LINK_CAP_ENHANCED_FRAMING;
1454
1455         dev_dbg(mhdp->dev, "Set sink device power state via DPCD\n");
1456         cdns_mhdp_link_power_up(&mhdp->aux, &mhdp->link);
1457
1458         cdns_mhdp_fill_sink_caps(mhdp, dpcd);
1459
1460         mhdp->link.rate = cdns_mhdp_max_link_rate(mhdp);
1461         mhdp->link.num_lanes = cdns_mhdp_max_num_lanes(mhdp);
1462
1463         /* Disable framer for link training */
1464         err = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp);
1465         if (err < 0) {
1466                 dev_err(mhdp->dev,
1467                         "Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n",
1468                         err);
1469                 return err;
1470         }
1471
1472         resp &= ~CDNS_DP_FRAMER_EN;
1473         cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, resp);
1474
1475         /* Spread AMP if required, enable 8b/10b coding */
1476         amp[0] = cdns_mhdp_get_ssc_supported(mhdp) ? DP_SPREAD_AMP_0_5 : 0;
1477         amp[1] = DP_SET_ANSI_8B10B;
1478         drm_dp_dpcd_write(&mhdp->aux, DP_DOWNSPREAD_CTRL, amp, 2);
1479
1480         if (mhdp->host.fast_link & mhdp->sink.fast_link) {
1481                 dev_err(mhdp->dev, "fastlink not supported\n");
1482                 return -EOPNOTSUPP;
1483         }
1484
1485         interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] & DP_TRAINING_AUX_RD_MASK;
1486         interval_us = cdns_mhdp_get_training_interval_us(mhdp, interval);
1487         if (!interval_us ||
1488             cdns_mhdp_link_training(mhdp, interval_us)) {
1489                 dev_err(mhdp->dev, "Link training failed. Exiting.\n");
1490                 return -EIO;
1491         }
1492
1493         mhdp->link_up = true;
1494
1495         return 0;
1496 }
1497
1498 static void cdns_mhdp_link_down(struct cdns_mhdp_device *mhdp)
1499 {
1500         WARN_ON(!mutex_is_locked(&mhdp->link_mutex));
1501
1502         if (mhdp->plugged)
1503                 cdns_mhdp_link_power_down(&mhdp->aux, &mhdp->link);
1504
1505         mhdp->link_up = false;
1506 }
1507
1508 static struct edid *cdns_mhdp_get_edid(struct cdns_mhdp_device *mhdp,
1509                                        struct drm_connector *connector)
1510 {
1511         if (!mhdp->plugged)
1512                 return NULL;
1513
1514         return drm_do_get_edid(connector, cdns_mhdp_get_edid_block, mhdp);
1515 }
1516
1517 static int cdns_mhdp_get_modes(struct drm_connector *connector)
1518 {
1519         struct cdns_mhdp_device *mhdp = connector_to_mhdp(connector);
1520         struct edid *edid;
1521         int num_modes;
1522
1523         if (!mhdp->plugged)
1524                 return 0;
1525
1526         edid = cdns_mhdp_get_edid(mhdp, connector);
1527         if (!edid) {
1528                 dev_err(mhdp->dev, "Failed to read EDID\n");
1529                 return 0;
1530         }
1531
1532         drm_connector_update_edid_property(connector, edid);
1533         num_modes = drm_add_edid_modes(connector, edid);
1534         kfree(edid);
1535
1536         /*
1537          * HACK: Warn about unsupported display formats until we deal
1538          *       with them correctly.
1539          */
1540         if (connector->display_info.color_formats &&
1541             !(connector->display_info.color_formats &
1542               mhdp->display_fmt.color_format))
1543                 dev_warn(mhdp->dev,
1544                          "%s: No supported color_format found (0x%08x)\n",
1545                         __func__, connector->display_info.color_formats);
1546
1547         if (connector->display_info.bpc &&
1548             connector->display_info.bpc < mhdp->display_fmt.bpc)
1549                 dev_warn(mhdp->dev, "%s: Display bpc only %d < %d\n",
1550                          __func__, connector->display_info.bpc,
1551                          mhdp->display_fmt.bpc);
1552
1553         return num_modes;
1554 }
1555
1556 static int cdns_mhdp_connector_detect(struct drm_connector *conn,
1557                                       struct drm_modeset_acquire_ctx *ctx,
1558                                       bool force)
1559 {
1560         struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
1561
1562         return cdns_mhdp_detect(mhdp);
1563 }
1564
1565 static u32 cdns_mhdp_get_bpp(struct cdns_mhdp_display_fmt *fmt)
1566 {
1567         u32 bpp;
1568
1569         if (fmt->y_only)
1570                 return fmt->bpc;
1571
1572         switch (fmt->color_format) {
1573         case DRM_COLOR_FORMAT_RGB444:
1574         case DRM_COLOR_FORMAT_YCBCR444:
1575                 bpp = fmt->bpc * 3;
1576                 break;
1577         case DRM_COLOR_FORMAT_YCBCR422:
1578                 bpp = fmt->bpc * 2;
1579                 break;
1580         case DRM_COLOR_FORMAT_YCBCR420:
1581                 bpp = fmt->bpc * 3 / 2;
1582                 break;
1583         default:
1584                 bpp = fmt->bpc * 3;
1585                 WARN_ON(1);
1586         }
1587         return bpp;
1588 }
1589
1590 static
1591 bool cdns_mhdp_bandwidth_ok(struct cdns_mhdp_device *mhdp,
1592                             const struct drm_display_mode *mode,
1593                             unsigned int lanes, unsigned int rate)
1594 {
1595         u32 max_bw, req_bw, bpp;
1596
1597         /*
1598          * mode->clock is expressed in kHz. Multiplying by bpp and dividing by 8
1599          * we get the number of kB/s. DisplayPort applies a 8b-10b encoding, the
1600          * value thus equals the bandwidth in 10kb/s units, which matches the
1601          * units of the rate parameter.
1602          */
1603
1604         bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt);
1605         req_bw = mode->clock * bpp / 8;
1606         max_bw = lanes * rate;
1607         if (req_bw > max_bw) {
1608                 dev_dbg(mhdp->dev,
1609                         "Unsupported Mode: %s, Req BW: %u, Available Max BW:%u\n",
1610                         mode->name, req_bw, max_bw);
1611
1612                 return false;
1613         }
1614
1615         return true;
1616 }
1617
1618 static
1619 enum drm_mode_status cdns_mhdp_mode_valid(struct drm_connector *conn,
1620                                           struct drm_display_mode *mode)
1621 {
1622         struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
1623
1624         mutex_lock(&mhdp->link_mutex);
1625
1626         if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
1627                                     mhdp->link.rate)) {
1628                 mutex_unlock(&mhdp->link_mutex);
1629                 return MODE_CLOCK_HIGH;
1630         }
1631
1632         mutex_unlock(&mhdp->link_mutex);
1633         return MODE_OK;
1634 }
1635
1636 static int cdns_mhdp_connector_atomic_check(struct drm_connector *conn,
1637                                             struct drm_atomic_state *state)
1638 {
1639         struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
1640         struct drm_connector_state *old_state, *new_state;
1641         struct drm_crtc_state *crtc_state;
1642         u64 old_cp, new_cp;
1643
1644         if (!mhdp->hdcp_supported)
1645                 return 0;
1646
1647         old_state = drm_atomic_get_old_connector_state(state, conn);
1648         new_state = drm_atomic_get_new_connector_state(state, conn);
1649         old_cp = old_state->content_protection;
1650         new_cp = new_state->content_protection;
1651
1652         if (old_state->hdcp_content_type != new_state->hdcp_content_type &&
1653             new_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
1654                 new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
1655                 goto mode_changed;
1656         }
1657
1658         if (!new_state->crtc) {
1659                 if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
1660                         new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
1661                 return 0;
1662         }
1663
1664         if (old_cp == new_cp ||
1665             (old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
1666              new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED))
1667                 return 0;
1668
1669 mode_changed:
1670         crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc);
1671         crtc_state->mode_changed = true;
1672
1673         return 0;
1674 }
1675
1676 static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = {
1677         .detect_ctx = cdns_mhdp_connector_detect,
1678         .get_modes = cdns_mhdp_get_modes,
1679         .mode_valid = cdns_mhdp_mode_valid,
1680         .atomic_check = cdns_mhdp_connector_atomic_check,
1681 };
1682
1683 static const struct drm_connector_funcs cdns_mhdp_conn_funcs = {
1684         .fill_modes = drm_helper_probe_single_connector_modes,
1685         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1686         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1687         .reset = drm_atomic_helper_connector_reset,
1688         .destroy = drm_connector_cleanup,
1689 };
1690
1691 static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp)
1692 {
1693         u32 bus_format = MEDIA_BUS_FMT_RGB121212_1X36;
1694         struct drm_connector *conn = &mhdp->connector;
1695         struct drm_bridge *bridge = &mhdp->bridge;
1696         int ret;
1697
1698         if (!bridge->encoder) {
1699                 dev_err(mhdp->dev, "Parent encoder object not found");
1700                 return -ENODEV;
1701         }
1702
1703         conn->polled = DRM_CONNECTOR_POLL_HPD;
1704
1705         ret = drm_connector_init(bridge->dev, conn, &cdns_mhdp_conn_funcs,
1706                                  DRM_MODE_CONNECTOR_DisplayPort);
1707         if (ret) {
1708                 dev_err(mhdp->dev, "Failed to initialize connector with drm\n");
1709                 return ret;
1710         }
1711
1712         drm_connector_helper_add(conn, &cdns_mhdp_conn_helper_funcs);
1713
1714         ret = drm_display_info_set_bus_formats(&conn->display_info,
1715                                                &bus_format, 1);
1716         if (ret)
1717                 return ret;
1718
1719         ret = drm_connector_attach_encoder(conn, bridge->encoder);
1720         if (ret) {
1721                 dev_err(mhdp->dev, "Failed to attach connector to encoder\n");
1722                 return ret;
1723         }
1724
1725         if (mhdp->hdcp_supported)
1726                 ret = drm_connector_attach_content_protection_property(conn, true);
1727
1728         return ret;
1729 }
1730
1731 static int cdns_mhdp_attach(struct drm_bridge *bridge,
1732                             enum drm_bridge_attach_flags flags)
1733 {
1734         struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
1735         bool hw_ready;
1736         int ret;
1737
1738         dev_dbg(mhdp->dev, "%s\n", __func__);
1739
1740         mhdp->aux.drm_dev = bridge->dev;
1741         ret = drm_dp_aux_register(&mhdp->aux);
1742         if (ret < 0)
1743                 return ret;
1744
1745         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
1746                 ret = cdns_mhdp_connector_init(mhdp);
1747                 if (ret)
1748                         goto aux_unregister;
1749         }
1750
1751         spin_lock(&mhdp->start_lock);
1752
1753         mhdp->bridge_attached = true;
1754         hw_ready = mhdp->hw_state == MHDP_HW_READY;
1755
1756         spin_unlock(&mhdp->start_lock);
1757
1758         /* Enable SW event interrupts */
1759         if (hw_ready)
1760                 cdns_mhdp_bridge_hpd_enable(bridge);
1761
1762         return 0;
1763 aux_unregister:
1764         drm_dp_aux_unregister(&mhdp->aux);
1765         return ret;
1766 }
1767
1768 static void cdns_mhdp_configure_video(struct cdns_mhdp_device *mhdp,
1769                                       const struct drm_display_mode *mode)
1770 {
1771         unsigned int dp_framer_sp = 0, msa_horizontal_1,
1772                 msa_vertical_1, bnd_hsync2vsync, hsync2vsync_pol_ctrl,
1773                 misc0 = 0, misc1 = 0, pxl_repr,
1774                 front_porch, back_porch, msa_h0, msa_v0, hsync, vsync,
1775                 dp_vertical_1;
1776         u8 stream_id = mhdp->stream_id;
1777         u32 bpp, bpc, pxlfmt, framer;
1778         int ret;
1779
1780         pxlfmt = mhdp->display_fmt.color_format;
1781         bpc = mhdp->display_fmt.bpc;
1782
1783         /*
1784          * If YCBCR supported and stream not SD, use ITU709
1785          * Need to handle ITU version with YCBCR420 when supported
1786          */
1787         if ((pxlfmt == DRM_COLOR_FORMAT_YCBCR444 ||
1788              pxlfmt == DRM_COLOR_FORMAT_YCBCR422) && mode->crtc_vdisplay >= 720)
1789                 misc0 = DP_YCBCR_COEFFICIENTS_ITU709;
1790
1791         bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt);
1792
1793         switch (pxlfmt) {
1794         case DRM_COLOR_FORMAT_RGB444:
1795                 pxl_repr = CDNS_DP_FRAMER_RGB << CDNS_DP_FRAMER_PXL_FORMAT;
1796                 misc0 |= DP_COLOR_FORMAT_RGB;
1797                 break;
1798         case DRM_COLOR_FORMAT_YCBCR444:
1799                 pxl_repr = CDNS_DP_FRAMER_YCBCR444 << CDNS_DP_FRAMER_PXL_FORMAT;
1800                 misc0 |= DP_COLOR_FORMAT_YCbCr444 | DP_TEST_DYNAMIC_RANGE_CEA;
1801                 break;
1802         case DRM_COLOR_FORMAT_YCBCR422:
1803                 pxl_repr = CDNS_DP_FRAMER_YCBCR422 << CDNS_DP_FRAMER_PXL_FORMAT;
1804                 misc0 |= DP_COLOR_FORMAT_YCbCr422 | DP_TEST_DYNAMIC_RANGE_CEA;
1805                 break;
1806         case DRM_COLOR_FORMAT_YCBCR420:
1807                 pxl_repr = CDNS_DP_FRAMER_YCBCR420 << CDNS_DP_FRAMER_PXL_FORMAT;
1808                 break;
1809         default:
1810                 pxl_repr = CDNS_DP_FRAMER_Y_ONLY << CDNS_DP_FRAMER_PXL_FORMAT;
1811         }
1812
1813         switch (bpc) {
1814         case 6:
1815                 misc0 |= DP_TEST_BIT_DEPTH_6;
1816                 pxl_repr |= CDNS_DP_FRAMER_6_BPC;
1817                 break;
1818         case 8:
1819                 misc0 |= DP_TEST_BIT_DEPTH_8;
1820                 pxl_repr |= CDNS_DP_FRAMER_8_BPC;
1821                 break;
1822         case 10:
1823                 misc0 |= DP_TEST_BIT_DEPTH_10;
1824                 pxl_repr |= CDNS_DP_FRAMER_10_BPC;
1825                 break;
1826         case 12:
1827                 misc0 |= DP_TEST_BIT_DEPTH_12;
1828                 pxl_repr |= CDNS_DP_FRAMER_12_BPC;
1829                 break;
1830         case 16:
1831                 misc0 |= DP_TEST_BIT_DEPTH_16;
1832                 pxl_repr |= CDNS_DP_FRAMER_16_BPC;
1833                 break;
1834         }
1835
1836         bnd_hsync2vsync = CDNS_IP_BYPASS_V_INTERFACE;
1837         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1838                 bnd_hsync2vsync |= CDNS_IP_DET_INTERLACE_FORMAT;
1839
1840         cdns_mhdp_reg_write(mhdp, CDNS_BND_HSYNC2VSYNC(stream_id),
1841                             bnd_hsync2vsync);
1842
1843         hsync2vsync_pol_ctrl = 0;
1844         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
1845                 hsync2vsync_pol_ctrl |= CDNS_H2V_HSYNC_POL_ACTIVE_LOW;
1846         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
1847                 hsync2vsync_pol_ctrl |= CDNS_H2V_VSYNC_POL_ACTIVE_LOW;
1848         cdns_mhdp_reg_write(mhdp, CDNS_HSYNC2VSYNC_POL_CTRL(stream_id),
1849                             hsync2vsync_pol_ctrl);
1850
1851         cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_PXL_REPR(stream_id), pxl_repr);
1852
1853         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1854                 dp_framer_sp |= CDNS_DP_FRAMER_INTERLACE;
1855         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
1856                 dp_framer_sp |= CDNS_DP_FRAMER_HSYNC_POL_LOW;
1857         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
1858                 dp_framer_sp |= CDNS_DP_FRAMER_VSYNC_POL_LOW;
1859         cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_SP(stream_id), dp_framer_sp);
1860
1861         front_porch = mode->crtc_hsync_start - mode->crtc_hdisplay;
1862         back_porch = mode->crtc_htotal - mode->crtc_hsync_end;
1863         cdns_mhdp_reg_write(mhdp, CDNS_DP_FRONT_BACK_PORCH(stream_id),
1864                             CDNS_DP_FRONT_PORCH(front_porch) |
1865                             CDNS_DP_BACK_PORCH(back_porch));
1866
1867         cdns_mhdp_reg_write(mhdp, CDNS_DP_BYTE_COUNT(stream_id),
1868                             mode->crtc_hdisplay * bpp / 8);
1869
1870         msa_h0 = mode->crtc_htotal - mode->crtc_hsync_start;
1871         cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_0(stream_id),
1872                             CDNS_DP_MSAH0_H_TOTAL(mode->crtc_htotal) |
1873                             CDNS_DP_MSAH0_HSYNC_START(msa_h0));
1874
1875         hsync = mode->crtc_hsync_end - mode->crtc_hsync_start;
1876         msa_horizontal_1 = CDNS_DP_MSAH1_HSYNC_WIDTH(hsync) |
1877                            CDNS_DP_MSAH1_HDISP_WIDTH(mode->crtc_hdisplay);
1878         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
1879                 msa_horizontal_1 |= CDNS_DP_MSAH1_HSYNC_POL_LOW;
1880         cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_1(stream_id),
1881                             msa_horizontal_1);
1882
1883         msa_v0 = mode->crtc_vtotal - mode->crtc_vsync_start;
1884         cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_0(stream_id),
1885                             CDNS_DP_MSAV0_V_TOTAL(mode->crtc_vtotal) |
1886                             CDNS_DP_MSAV0_VSYNC_START(msa_v0));
1887
1888         vsync = mode->crtc_vsync_end - mode->crtc_vsync_start;
1889         msa_vertical_1 = CDNS_DP_MSAV1_VSYNC_WIDTH(vsync) |
1890                          CDNS_DP_MSAV1_VDISP_WIDTH(mode->crtc_vdisplay);
1891         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
1892                 msa_vertical_1 |= CDNS_DP_MSAV1_VSYNC_POL_LOW;
1893         cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_1(stream_id),
1894                             msa_vertical_1);
1895
1896         if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
1897             mode->crtc_vtotal % 2 == 0)
1898                 misc1 = DP_TEST_INTERLACED;
1899         if (mhdp->display_fmt.y_only)
1900                 misc1 |= CDNS_DP_TEST_COLOR_FORMAT_RAW_Y_ONLY;
1901         /* Use VSC SDP for Y420 */
1902         if (pxlfmt == DRM_COLOR_FORMAT_YCBCR420)
1903                 misc1 = CDNS_DP_TEST_VSC_SDP;
1904
1905         cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_MISC(stream_id),
1906                             misc0 | (misc1 << 8));
1907
1908         cdns_mhdp_reg_write(mhdp, CDNS_DP_HORIZONTAL(stream_id),
1909                             CDNS_DP_H_HSYNC_WIDTH(hsync) |
1910                             CDNS_DP_H_H_TOTAL(mode->crtc_hdisplay));
1911
1912         cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_0(stream_id),
1913                             CDNS_DP_V0_VHEIGHT(mode->crtc_vdisplay) |
1914                             CDNS_DP_V0_VSTART(msa_v0));
1915
1916         dp_vertical_1 = CDNS_DP_V1_VTOTAL(mode->crtc_vtotal);
1917         if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
1918             mode->crtc_vtotal % 2 == 0)
1919                 dp_vertical_1 |= CDNS_DP_V1_VTOTAL_EVEN;
1920
1921         cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_1(stream_id), dp_vertical_1);
1922
1923         cdns_mhdp_reg_write_bit(mhdp, CDNS_DP_VB_ID(stream_id), 2, 1,
1924                                 (mode->flags & DRM_MODE_FLAG_INTERLACE) ?
1925                                 CDNS_DP_VB_ID_INTERLACED : 0);
1926
1927         ret = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &framer);
1928         if (ret < 0) {
1929                 dev_err(mhdp->dev,
1930                         "Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n",
1931                         ret);
1932                 return;
1933         }
1934         framer |= CDNS_DP_FRAMER_EN;
1935         framer &= ~CDNS_DP_NO_VIDEO_MODE;
1936         cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, framer);
1937 }
1938
1939 static void cdns_mhdp_sst_enable(struct cdns_mhdp_device *mhdp,
1940                                  const struct drm_display_mode *mode)
1941 {
1942         u32 rate, vs, required_bandwidth, available_bandwidth;
1943         s32 line_thresh1, line_thresh2, line_thresh = 0;
1944         int pxlclock = mode->crtc_clock;
1945         u32 tu_size = 64;
1946         u32 bpp;
1947
1948         /* Get rate in MSymbols per second per lane */
1949         rate = mhdp->link.rate / 1000;
1950
1951         bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt);
1952
1953         required_bandwidth = pxlclock * bpp / 8;
1954         available_bandwidth = mhdp->link.num_lanes * rate;
1955
1956         vs = tu_size * required_bandwidth / available_bandwidth;
1957         vs /= 1000;
1958
1959         if (vs == tu_size)
1960                 vs = tu_size - 1;
1961
1962         line_thresh1 = ((vs + 1) << 5) * 8 / bpp;
1963         line_thresh2 = (pxlclock << 5) / 1000 / rate * (vs + 1) - (1 << 5);
1964         line_thresh = line_thresh1 - line_thresh2 / (s32)mhdp->link.num_lanes;
1965         line_thresh = (line_thresh >> 5) + 2;
1966
1967         mhdp->stream_id = 0;
1968
1969         cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_TU,
1970                             CDNS_DP_FRAMER_TU_VS(vs) |
1971                             CDNS_DP_FRAMER_TU_SIZE(tu_size) |
1972                             CDNS_DP_FRAMER_TU_CNT_RST_EN);
1973
1974         cdns_mhdp_reg_write(mhdp, CDNS_DP_LINE_THRESH(0),
1975                             line_thresh & GENMASK(5, 0));
1976
1977         cdns_mhdp_reg_write(mhdp, CDNS_DP_STREAM_CONFIG_2(0),
1978                             CDNS_DP_SC2_TU_VS_DIFF((tu_size - vs > 3) ?
1979                                                    0 : tu_size - vs));
1980
1981         cdns_mhdp_configure_video(mhdp, mode);
1982 }
1983
1984 static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge,
1985                                     struct drm_bridge_state *bridge_state)
1986 {
1987         struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
1988         struct drm_atomic_state *state = bridge_state->base.state;
1989         struct cdns_mhdp_bridge_state *mhdp_state;
1990         struct drm_crtc_state *crtc_state;
1991         struct drm_connector *connector;
1992         struct drm_connector_state *conn_state;
1993         struct drm_bridge_state *new_state;
1994         const struct drm_display_mode *mode;
1995         u32 resp;
1996         int ret;
1997
1998         dev_dbg(mhdp->dev, "bridge enable\n");
1999
2000         mutex_lock(&mhdp->link_mutex);
2001
2002         if (mhdp->plugged && !mhdp->link_up) {
2003                 ret = cdns_mhdp_link_up(mhdp);
2004                 if (ret < 0)
2005                         goto out;
2006         }
2007
2008         if (mhdp->info && mhdp->info->ops && mhdp->info->ops->enable)
2009                 mhdp->info->ops->enable(mhdp);
2010
2011         /* Enable VIF clock for stream 0 */
2012         ret = cdns_mhdp_reg_read(mhdp, CDNS_DPTX_CAR, &resp);
2013         if (ret < 0) {
2014                 dev_err(mhdp->dev, "Failed to read CDNS_DPTX_CAR %d\n", ret);
2015                 goto out;
2016         }
2017
2018         cdns_mhdp_reg_write(mhdp, CDNS_DPTX_CAR,
2019                             resp | CDNS_VIF_CLK_EN | CDNS_VIF_CLK_RSTN);
2020
2021         connector = drm_atomic_get_new_connector_for_encoder(state,
2022                                                              bridge->encoder);
2023         if (WARN_ON(!connector))
2024                 goto out;
2025
2026         conn_state = drm_atomic_get_new_connector_state(state, connector);
2027         if (WARN_ON(!conn_state))
2028                 goto out;
2029
2030         if (mhdp->hdcp_supported &&
2031             mhdp->hw_state == MHDP_HW_READY &&
2032             conn_state->content_protection ==
2033             DRM_MODE_CONTENT_PROTECTION_DESIRED) {
2034                 mutex_unlock(&mhdp->link_mutex);
2035                 cdns_mhdp_hdcp_enable(mhdp, conn_state->hdcp_content_type);
2036                 mutex_lock(&mhdp->link_mutex);
2037         }
2038
2039         crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
2040         if (WARN_ON(!crtc_state))
2041                 goto out;
2042
2043         mode = &crtc_state->adjusted_mode;
2044
2045         new_state = drm_atomic_get_new_bridge_state(state, bridge);
2046         if (WARN_ON(!new_state))
2047                 goto out;
2048
2049         if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
2050                                     mhdp->link.rate)) {
2051                 ret = -EINVAL;
2052                 goto out;
2053         }
2054
2055         cdns_mhdp_sst_enable(mhdp, mode);
2056
2057         mhdp_state = to_cdns_mhdp_bridge_state(new_state);
2058
2059         mhdp_state->current_mode = drm_mode_duplicate(bridge->dev, mode);
2060         drm_mode_set_name(mhdp_state->current_mode);
2061
2062         dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__, mode->name);
2063
2064         mhdp->bridge_enabled = true;
2065
2066 out:
2067         mutex_unlock(&mhdp->link_mutex);
2068         if (ret < 0)
2069                 schedule_work(&mhdp->modeset_retry_work);
2070 }
2071
2072 static void cdns_mhdp_atomic_disable(struct drm_bridge *bridge,
2073                                      struct drm_bridge_state *bridge_state)
2074 {
2075         struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
2076         u32 resp;
2077
2078         dev_dbg(mhdp->dev, "%s\n", __func__);
2079
2080         mutex_lock(&mhdp->link_mutex);
2081
2082         if (mhdp->hdcp_supported)
2083                 cdns_mhdp_hdcp_disable(mhdp);
2084
2085         mhdp->bridge_enabled = false;
2086         cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp);
2087         resp &= ~CDNS_DP_FRAMER_EN;
2088         resp |= CDNS_DP_NO_VIDEO_MODE;
2089         cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, resp);
2090
2091         cdns_mhdp_link_down(mhdp);
2092
2093         /* Disable VIF clock for stream 0 */
2094         cdns_mhdp_reg_read(mhdp, CDNS_DPTX_CAR, &resp);
2095         cdns_mhdp_reg_write(mhdp, CDNS_DPTX_CAR,
2096                             resp & ~(CDNS_VIF_CLK_EN | CDNS_VIF_CLK_RSTN));
2097
2098         if (mhdp->info && mhdp->info->ops && mhdp->info->ops->disable)
2099                 mhdp->info->ops->disable(mhdp);
2100
2101         mutex_unlock(&mhdp->link_mutex);
2102 }
2103
2104 static void cdns_mhdp_detach(struct drm_bridge *bridge)
2105 {
2106         struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
2107
2108         dev_dbg(mhdp->dev, "%s\n", __func__);
2109
2110         drm_dp_aux_unregister(&mhdp->aux);
2111
2112         spin_lock(&mhdp->start_lock);
2113
2114         mhdp->bridge_attached = false;
2115
2116         spin_unlock(&mhdp->start_lock);
2117
2118         writel(~0, mhdp->regs + CDNS_APB_INT_MASK);
2119 }
2120
2121 static struct drm_bridge_state *
2122 cdns_mhdp_bridge_atomic_duplicate_state(struct drm_bridge *bridge)
2123 {
2124         struct cdns_mhdp_bridge_state *state;
2125
2126         state = kzalloc(sizeof(*state), GFP_KERNEL);
2127         if (!state)
2128                 return NULL;
2129
2130         __drm_atomic_helper_bridge_duplicate_state(bridge, &state->base);
2131
2132         return &state->base;
2133 }
2134
2135 static void
2136 cdns_mhdp_bridge_atomic_destroy_state(struct drm_bridge *bridge,
2137                                       struct drm_bridge_state *state)
2138 {
2139         struct cdns_mhdp_bridge_state *cdns_mhdp_state;
2140
2141         cdns_mhdp_state = to_cdns_mhdp_bridge_state(state);
2142
2143         if (cdns_mhdp_state->current_mode) {
2144                 drm_mode_destroy(bridge->dev, cdns_mhdp_state->current_mode);
2145                 cdns_mhdp_state->current_mode = NULL;
2146         }
2147
2148         kfree(cdns_mhdp_state);
2149 }
2150
2151 static struct drm_bridge_state *
2152 cdns_mhdp_bridge_atomic_reset(struct drm_bridge *bridge)
2153 {
2154         struct cdns_mhdp_bridge_state *cdns_mhdp_state;
2155
2156         cdns_mhdp_state = kzalloc(sizeof(*cdns_mhdp_state), GFP_KERNEL);
2157         if (!cdns_mhdp_state)
2158                 return NULL;
2159
2160         __drm_atomic_helper_bridge_reset(bridge, &cdns_mhdp_state->base);
2161
2162         return &cdns_mhdp_state->base;
2163 }
2164
2165 static u32 *cdns_mhdp_get_input_bus_fmts(struct drm_bridge *bridge,
2166                                          struct drm_bridge_state *bridge_state,
2167                                          struct drm_crtc_state *crtc_state,
2168                                          struct drm_connector_state *conn_state,
2169                                          u32 output_fmt,
2170                                          unsigned int *num_input_fmts)
2171 {
2172         u32 *input_fmts;
2173
2174         *num_input_fmts = 0;
2175
2176         input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
2177         if (!input_fmts)
2178                 return NULL;
2179
2180         *num_input_fmts = 1;
2181         input_fmts[0] = MEDIA_BUS_FMT_RGB121212_1X36;
2182
2183         return input_fmts;
2184 }
2185
2186 static int cdns_mhdp_atomic_check(struct drm_bridge *bridge,
2187                                   struct drm_bridge_state *bridge_state,
2188                                   struct drm_crtc_state *crtc_state,
2189                                   struct drm_connector_state *conn_state)
2190 {
2191         struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
2192         const struct drm_display_mode *mode = &crtc_state->adjusted_mode;
2193
2194         mutex_lock(&mhdp->link_mutex);
2195
2196         if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
2197                                     mhdp->link.rate)) {
2198                 dev_err(mhdp->dev, "%s: Not enough BW for %s (%u lanes at %u Mbps)\n",
2199                         __func__, mode->name, mhdp->link.num_lanes,
2200                         mhdp->link.rate / 100);
2201                 mutex_unlock(&mhdp->link_mutex);
2202                 return -EINVAL;
2203         }
2204
2205         /*
2206          * There might be flags negotiation supported in future.
2207          * Set the bus flags in atomic_check statically for now.
2208          */
2209         if (mhdp->info)
2210                 bridge_state->input_bus_cfg.flags = *mhdp->info->input_bus_flags;
2211
2212         mutex_unlock(&mhdp->link_mutex);
2213         return 0;
2214 }
2215
2216 static enum drm_connector_status cdns_mhdp_bridge_detect(struct drm_bridge *bridge)
2217 {
2218         struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
2219
2220         return cdns_mhdp_detect(mhdp);
2221 }
2222
2223 static struct edid *cdns_mhdp_bridge_get_edid(struct drm_bridge *bridge,
2224                                               struct drm_connector *connector)
2225 {
2226         struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
2227
2228         return cdns_mhdp_get_edid(mhdp, connector);
2229 }
2230
2231 static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
2232         .atomic_enable = cdns_mhdp_atomic_enable,
2233         .atomic_disable = cdns_mhdp_atomic_disable,
2234         .atomic_check = cdns_mhdp_atomic_check,
2235         .attach = cdns_mhdp_attach,
2236         .detach = cdns_mhdp_detach,
2237         .atomic_duplicate_state = cdns_mhdp_bridge_atomic_duplicate_state,
2238         .atomic_destroy_state = cdns_mhdp_bridge_atomic_destroy_state,
2239         .atomic_reset = cdns_mhdp_bridge_atomic_reset,
2240         .atomic_get_input_bus_fmts = cdns_mhdp_get_input_bus_fmts,
2241         .detect = cdns_mhdp_bridge_detect,
2242         .get_edid = cdns_mhdp_bridge_get_edid,
2243         .hpd_enable = cdns_mhdp_bridge_hpd_enable,
2244         .hpd_disable = cdns_mhdp_bridge_hpd_disable,
2245 };
2246
2247 static bool cdns_mhdp_detect_hpd(struct cdns_mhdp_device *mhdp, bool *hpd_pulse)
2248 {
2249         int hpd_event, hpd_status;
2250
2251         *hpd_pulse = false;
2252
2253         hpd_event = cdns_mhdp_read_hpd_event(mhdp);
2254
2255         /* Getting event bits failed, bail out */
2256         if (hpd_event < 0) {
2257                 dev_warn(mhdp->dev, "%s: read event failed: %d\n",
2258                          __func__, hpd_event);
2259                 return false;
2260         }
2261
2262         hpd_status = cdns_mhdp_get_hpd_status(mhdp);
2263         if (hpd_status < 0) {
2264                 dev_warn(mhdp->dev, "%s: get hpd status failed: %d\n",
2265                          __func__, hpd_status);
2266                 return false;
2267         }
2268
2269         if (hpd_event & DPTX_READ_EVENT_HPD_PULSE)
2270                 *hpd_pulse = true;
2271
2272         return !!hpd_status;
2273 }
2274
2275 static int cdns_mhdp_update_link_status(struct cdns_mhdp_device *mhdp)
2276 {
2277         struct cdns_mhdp_bridge_state *cdns_bridge_state;
2278         struct drm_display_mode *current_mode;
2279         bool old_plugged = mhdp->plugged;
2280         struct drm_bridge_state *state;
2281         u8 status[DP_LINK_STATUS_SIZE];
2282         bool hpd_pulse;
2283         int ret = 0;
2284
2285         mutex_lock(&mhdp->link_mutex);
2286
2287         mhdp->plugged = cdns_mhdp_detect_hpd(mhdp, &hpd_pulse);
2288
2289         if (!mhdp->plugged) {
2290                 cdns_mhdp_link_down(mhdp);
2291                 mhdp->link.rate = mhdp->host.link_rate;
2292                 mhdp->link.num_lanes = mhdp->host.lanes_cnt;
2293                 goto out;
2294         }
2295
2296         /*
2297          * If we get a HPD pulse event and we were and still are connected,
2298          * check the link status. If link status is ok, there's nothing to do
2299          * as we don't handle DP interrupts. If link status is bad, continue
2300          * with full link setup.
2301          */
2302         if (hpd_pulse && old_plugged == mhdp->plugged) {
2303                 ret = drm_dp_dpcd_read_link_status(&mhdp->aux, status);
2304
2305                 /*
2306                  * If everything looks fine, just return, as we don't handle
2307                  * DP IRQs.
2308                  */
2309                 if (ret > 0 &&
2310                     drm_dp_channel_eq_ok(status, mhdp->link.num_lanes) &&
2311                     drm_dp_clock_recovery_ok(status, mhdp->link.num_lanes))
2312                         goto out;
2313
2314                 /* If link is bad, mark link as down so that we do a new LT */
2315                 mhdp->link_up = false;
2316         }
2317
2318         if (!mhdp->link_up) {
2319                 ret = cdns_mhdp_link_up(mhdp);
2320                 if (ret < 0)
2321                         goto out;
2322         }
2323
2324         if (mhdp->bridge_enabled) {
2325                 state = drm_priv_to_bridge_state(mhdp->bridge.base.state);
2326                 if (!state) {
2327                         ret = -EINVAL;
2328                         goto out;
2329                 }
2330
2331                 cdns_bridge_state = to_cdns_mhdp_bridge_state(state);
2332                 if (!cdns_bridge_state) {
2333                         ret = -EINVAL;
2334                         goto out;
2335                 }
2336
2337                 current_mode = cdns_bridge_state->current_mode;
2338                 if (!current_mode) {
2339                         ret = -EINVAL;
2340                         goto out;
2341                 }
2342
2343                 if (!cdns_mhdp_bandwidth_ok(mhdp, current_mode, mhdp->link.num_lanes,
2344                                             mhdp->link.rate)) {
2345                         ret = -EINVAL;
2346                         goto out;
2347                 }
2348
2349                 dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__,
2350                         current_mode->name);
2351
2352                 cdns_mhdp_sst_enable(mhdp, current_mode);
2353         }
2354 out:
2355         mutex_unlock(&mhdp->link_mutex);
2356         return ret;
2357 }
2358
2359 static void cdns_mhdp_modeset_retry_fn(struct work_struct *work)
2360 {
2361         struct cdns_mhdp_device *mhdp;
2362         struct drm_connector *conn;
2363
2364         mhdp = container_of(work, typeof(*mhdp), modeset_retry_work);
2365
2366         conn = &mhdp->connector;
2367
2368         /* Grab the locks before changing connector property */
2369         mutex_lock(&conn->dev->mode_config.mutex);
2370
2371         /*
2372          * Set connector link status to BAD and send a Uevent to notify
2373          * userspace to do a modeset.
2374          */
2375         drm_connector_set_link_status_property(conn, DRM_MODE_LINK_STATUS_BAD);
2376         mutex_unlock(&conn->dev->mode_config.mutex);
2377
2378         /* Send Hotplug uevent so userspace can reprobe */
2379         drm_kms_helper_hotplug_event(mhdp->bridge.dev);
2380 }
2381
2382 static irqreturn_t cdns_mhdp_irq_handler(int irq, void *data)
2383 {
2384         struct cdns_mhdp_device *mhdp = data;
2385         u32 apb_stat, sw_ev0;
2386         bool bridge_attached;
2387
2388         apb_stat = readl(mhdp->regs + CDNS_APB_INT_STATUS);
2389         if (!(apb_stat & CDNS_APB_INT_MASK_SW_EVENT_INT))
2390                 return IRQ_NONE;
2391
2392         sw_ev0 = readl(mhdp->regs + CDNS_SW_EVENT0);
2393
2394         /*
2395          *  Calling drm_kms_helper_hotplug_event() when not attached
2396          *  to drm device causes an oops because the drm_bridge->dev
2397          *  is NULL. See cdns_mhdp_fw_cb() comments for details about the
2398          *  problems related drm_kms_helper_hotplug_event() call.
2399          */
2400         spin_lock(&mhdp->start_lock);
2401         bridge_attached = mhdp->bridge_attached;
2402         spin_unlock(&mhdp->start_lock);
2403
2404         if (bridge_attached && (sw_ev0 & CDNS_DPTX_HPD)) {
2405                 schedule_work(&mhdp->hpd_work);
2406         }
2407
2408         if (sw_ev0 & ~CDNS_DPTX_HPD) {
2409                 mhdp->sw_events |= (sw_ev0 & ~CDNS_DPTX_HPD);
2410                 wake_up(&mhdp->sw_events_wq);
2411         }
2412
2413         return IRQ_HANDLED;
2414 }
2415
2416 u32 cdns_mhdp_wait_for_sw_event(struct cdns_mhdp_device *mhdp, u32 event)
2417 {
2418         u32 ret;
2419
2420         ret = wait_event_timeout(mhdp->sw_events_wq,
2421                                  mhdp->sw_events & event,
2422                                  msecs_to_jiffies(500));
2423         if (!ret) {
2424                 dev_dbg(mhdp->dev, "SW event 0x%x timeout\n", event);
2425                 goto sw_event_out;
2426         }
2427
2428         ret = mhdp->sw_events;
2429         mhdp->sw_events &= ~event;
2430
2431 sw_event_out:
2432         return ret;
2433 }
2434
2435 static void cdns_mhdp_hpd_work(struct work_struct *work)
2436 {
2437         struct cdns_mhdp_device *mhdp = container_of(work,
2438                                                      struct cdns_mhdp_device,
2439                                                      hpd_work);
2440         int ret;
2441
2442         ret = cdns_mhdp_update_link_status(mhdp);
2443         if (mhdp->connector.dev) {
2444                 if (ret < 0)
2445                         schedule_work(&mhdp->modeset_retry_work);
2446                 else
2447                         drm_kms_helper_hotplug_event(mhdp->bridge.dev);
2448         } else {
2449                 drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp));
2450         }
2451 }
2452
2453 static int cdns_mhdp_probe(struct platform_device *pdev)
2454 {
2455         struct device *dev = &pdev->dev;
2456         struct cdns_mhdp_device *mhdp;
2457         unsigned long rate;
2458         struct clk *clk;
2459         int ret;
2460         int irq;
2461
2462         mhdp = devm_kzalloc(dev, sizeof(*mhdp), GFP_KERNEL);
2463         if (!mhdp)
2464                 return -ENOMEM;
2465
2466         clk = devm_clk_get(dev, NULL);
2467         if (IS_ERR(clk)) {
2468                 dev_err(dev, "couldn't get clk: %ld\n", PTR_ERR(clk));
2469                 return PTR_ERR(clk);
2470         }
2471
2472         mhdp->clk = clk;
2473         mhdp->dev = dev;
2474         mutex_init(&mhdp->mbox_mutex);
2475         mutex_init(&mhdp->link_mutex);
2476         spin_lock_init(&mhdp->start_lock);
2477
2478         drm_dp_aux_init(&mhdp->aux);
2479         mhdp->aux.dev = dev;
2480         mhdp->aux.transfer = cdns_mhdp_transfer;
2481
2482         mhdp->regs = devm_platform_ioremap_resource(pdev, 0);
2483         if (IS_ERR(mhdp->regs)) {
2484                 dev_err(dev, "Failed to get memory resource\n");
2485                 return PTR_ERR(mhdp->regs);
2486         }
2487
2488         mhdp->sapb_regs = devm_platform_ioremap_resource_byname(pdev, "mhdptx-sapb");
2489         if (IS_ERR(mhdp->sapb_regs)) {
2490                 mhdp->hdcp_supported = false;
2491                 dev_warn(dev,
2492                          "Failed to get SAPB memory resource, HDCP not supported\n");
2493         } else {
2494                 mhdp->hdcp_supported = true;
2495         }
2496
2497         mhdp->phy = devm_of_phy_get_by_index(dev, pdev->dev.of_node, 0);
2498         if (IS_ERR(mhdp->phy)) {
2499                 dev_err(dev, "no PHY configured\n");
2500                 return PTR_ERR(mhdp->phy);
2501         }
2502
2503         platform_set_drvdata(pdev, mhdp);
2504
2505         mhdp->info = of_device_get_match_data(dev);
2506
2507         clk_prepare_enable(clk);
2508
2509         pm_runtime_enable(dev);
2510         ret = pm_runtime_resume_and_get(dev);
2511         if (ret < 0) {
2512                 dev_err(dev, "pm_runtime_resume_and_get failed\n");
2513                 pm_runtime_disable(dev);
2514                 goto clk_disable;
2515         }
2516
2517         if (mhdp->info && mhdp->info->ops && mhdp->info->ops->init) {
2518                 ret = mhdp->info->ops->init(mhdp);
2519                 if (ret != 0) {
2520                         dev_err(dev, "MHDP platform initialization failed: %d\n",
2521                                 ret);
2522                         goto runtime_put;
2523                 }
2524         }
2525
2526         rate = clk_get_rate(clk);
2527         writel(rate % 1000000, mhdp->regs + CDNS_SW_CLK_L);
2528         writel(rate / 1000000, mhdp->regs + CDNS_SW_CLK_H);
2529
2530         dev_dbg(dev, "func clk rate %lu Hz\n", rate);
2531
2532         writel(~0, mhdp->regs + CDNS_APB_INT_MASK);
2533
2534         irq = platform_get_irq(pdev, 0);
2535         ret = devm_request_threaded_irq(mhdp->dev, irq, NULL,
2536                                         cdns_mhdp_irq_handler, IRQF_ONESHOT,
2537                                         "mhdp8546", mhdp);
2538         if (ret) {
2539                 dev_err(dev, "cannot install IRQ %d\n", irq);
2540                 ret = -EIO;
2541                 goto plat_fini;
2542         }
2543
2544         cdns_mhdp_fill_host_caps(mhdp);
2545
2546         /* Initialize link rate and num of lanes to host values */
2547         mhdp->link.rate = mhdp->host.link_rate;
2548         mhdp->link.num_lanes = mhdp->host.lanes_cnt;
2549
2550         /* The only currently supported format */
2551         mhdp->display_fmt.y_only = false;
2552         mhdp->display_fmt.color_format = DRM_COLOR_FORMAT_RGB444;
2553         mhdp->display_fmt.bpc = 8;
2554
2555         mhdp->bridge.of_node = pdev->dev.of_node;
2556         mhdp->bridge.funcs = &cdns_mhdp_bridge_funcs;
2557         mhdp->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
2558                            DRM_BRIDGE_OP_HPD;
2559         mhdp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
2560
2561         ret = phy_init(mhdp->phy);
2562         if (ret) {
2563                 dev_err(mhdp->dev, "Failed to initialize PHY: %d\n", ret);
2564                 goto plat_fini;
2565         }
2566
2567         /* Initialize the work for modeset in case of link train failure */
2568         INIT_WORK(&mhdp->modeset_retry_work, cdns_mhdp_modeset_retry_fn);
2569         INIT_WORK(&mhdp->hpd_work, cdns_mhdp_hpd_work);
2570
2571         init_waitqueue_head(&mhdp->fw_load_wq);
2572         init_waitqueue_head(&mhdp->sw_events_wq);
2573
2574         ret = cdns_mhdp_load_firmware(mhdp);
2575         if (ret)
2576                 goto phy_exit;
2577
2578         if (mhdp->hdcp_supported)
2579                 cdns_mhdp_hdcp_init(mhdp);
2580
2581         drm_bridge_add(&mhdp->bridge);
2582
2583         return 0;
2584
2585 phy_exit:
2586         phy_exit(mhdp->phy);
2587 plat_fini:
2588         if (mhdp->info && mhdp->info->ops && mhdp->info->ops->exit)
2589                 mhdp->info->ops->exit(mhdp);
2590 runtime_put:
2591         pm_runtime_put_sync(dev);
2592         pm_runtime_disable(dev);
2593 clk_disable:
2594         clk_disable_unprepare(mhdp->clk);
2595
2596         return ret;
2597 }
2598
2599 static int cdns_mhdp_remove(struct platform_device *pdev)
2600 {
2601         struct cdns_mhdp_device *mhdp = platform_get_drvdata(pdev);
2602         unsigned long timeout = msecs_to_jiffies(100);
2603         bool stop_fw = false;
2604         int ret;
2605
2606         drm_bridge_remove(&mhdp->bridge);
2607
2608         ret = wait_event_timeout(mhdp->fw_load_wq,
2609                                  mhdp->hw_state == MHDP_HW_READY,
2610                                  timeout);
2611         if (ret == 0)
2612                 dev_err(mhdp->dev, "%s: Timeout waiting for fw loading\n",
2613                         __func__);
2614         else
2615                 stop_fw = true;
2616
2617         spin_lock(&mhdp->start_lock);
2618         mhdp->hw_state = MHDP_HW_STOPPED;
2619         spin_unlock(&mhdp->start_lock);
2620
2621         if (stop_fw)
2622                 ret = cdns_mhdp_set_firmware_active(mhdp, false);
2623
2624         phy_exit(mhdp->phy);
2625
2626         if (mhdp->info && mhdp->info->ops && mhdp->info->ops->exit)
2627                 mhdp->info->ops->exit(mhdp);
2628
2629         pm_runtime_put_sync(&pdev->dev);
2630         pm_runtime_disable(&pdev->dev);
2631
2632         cancel_work_sync(&mhdp->modeset_retry_work);
2633         flush_work(&mhdp->hpd_work);
2634         /* Ignoring mhdp->hdcp.check_work and mhdp->hdcp.prop_work here. */
2635
2636         clk_disable_unprepare(mhdp->clk);
2637
2638         return ret;
2639 }
2640
2641 static const struct of_device_id mhdp_ids[] = {
2642         { .compatible = "cdns,mhdp8546", },
2643 #ifdef CONFIG_DRM_CDNS_MHDP8546_J721E
2644         { .compatible = "ti,j721e-mhdp8546",
2645           .data = &(const struct cdns_mhdp_platform_info) {
2646                   .input_bus_flags = &mhdp_ti_j721e_bridge_input_bus_flags,
2647                   .ops = &mhdp_ti_j721e_ops,
2648           },
2649         },
2650 #endif
2651         { /* sentinel */ }
2652 };
2653 MODULE_DEVICE_TABLE(of, mhdp_ids);
2654
2655 static struct platform_driver mhdp_driver = {
2656         .driver = {
2657                 .name           = "cdns-mhdp8546",
2658                 .of_match_table = mhdp_ids,
2659         },
2660         .probe  = cdns_mhdp_probe,
2661         .remove = cdns_mhdp_remove,
2662 };
2663 module_platform_driver(mhdp_driver);
2664
2665 MODULE_FIRMWARE(FW_NAME);
2666
2667 MODULE_AUTHOR("Quentin Schulz <[email protected]>");
2668 MODULE_AUTHOR("Swapnil Jakhade <[email protected]>");
2669 MODULE_AUTHOR("Yuti Amonkar <[email protected]>");
2670 MODULE_AUTHOR("Tomi Valkeinen <[email protected]>");
2671 MODULE_AUTHOR("Jyri Sarha <[email protected]>");
2672 MODULE_DESCRIPTION("Cadence MHDP8546 DP bridge driver");
2673 MODULE_LICENSE("GPL");
2674 MODULE_ALIAS("platform:cdns-mhdp8546");