drivers/gpu/drm/i915/display/intel_lspcon.c

   1 /*
   2  * Copyright © 2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  *
  24  */
  25
  26 #include <drm/drm_atomic_helper.h>
  27 #include <drm/drm_dp_dual_mode_helper.h>
  28 #include <drm/drm_edid.h>
  29
  30 #include "intel_display_types.h"
  31 #include "intel_dp.h"
  32 #include "intel_lspcon.h"
  33
  34 /* LSPCON OUI Vendor ID(signatures) */
  35 #define LSPCON_VENDOR_PARADE_OUI 0x001CF8
  36 #define LSPCON_VENDOR_MCA_OUI 0x0060AD
  37
  38 /* AUX addresses to write MCA AVI IF */
  39 #define LSPCON_MCA_AVI_IF_WRITE_OFFSET 0x5C0
  40 #define LSPCON_MCA_AVI_IF_CTRL 0x5DF
  41 #define  LSPCON_MCA_AVI_IF_KICKOFF (1 << 0)
  42 #define  LSPCON_MCA_AVI_IF_HANDLED (1 << 1)
  43
  44 /* AUX addresses to write Parade AVI IF */
  45 #define LSPCON_PARADE_AVI_IF_WRITE_OFFSET 0x516
  46 #define LSPCON_PARADE_AVI_IF_CTRL 0x51E
  47 #define  LSPCON_PARADE_AVI_IF_KICKOFF (1 << 7)
  48 #define LSPCON_PARADE_AVI_IF_DATA_SIZE 32
  49
  50 static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
  51 {
  52         struct intel_digital_port *dig_port =
  53                 container_of(lspcon, struct intel_digital_port, lspcon);
  54
  55         return &dig_port->dp;
  56 }
  57
  58 static const char *lspcon_mode_name(enum drm_lspcon_mode mode)
  59 {
  60         switch (mode) {
  61         case DRM_LSPCON_MODE_PCON:
  62                 return "PCON";
  63         case DRM_LSPCON_MODE_LS:
  64                 return "LS";
  65         case DRM_LSPCON_MODE_INVALID:
  66                 return "INVALID";
  67         default:
  68                 MISSING_CASE(mode);
  69                 return "INVALID";
  70         }
  71 }
  72
  73 static bool lspcon_detect_vendor(struct intel_lspcon *lspcon)
  74 {
  75         struct intel_dp *dp = lspcon_to_intel_dp(lspcon);
  76         struct drm_dp_dpcd_ident *ident;
  77         u32 vendor_oui;
  78
  79         if (drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd))) {
  80                 DRM_ERROR("Can't read description\n");
  81                 return false;
  82         }
  83
  84         ident = &dp->desc.ident;
  85         vendor_oui = (ident->oui[0] << 16) | (ident->oui[1] << 8) |
  86                       ident->oui[2];
  87
  88         switch (vendor_oui) {
  89         case LSPCON_VENDOR_MCA_OUI:
  90                 lspcon->vendor = LSPCON_VENDOR_MCA;
  91                 DRM_DEBUG_KMS("Vendor: Mega Chips\n");
  92                 break;
  93
  94         case LSPCON_VENDOR_PARADE_OUI:
  95                 lspcon->vendor = LSPCON_VENDOR_PARADE;
  96                 DRM_DEBUG_KMS("Vendor: Parade Tech\n");
  97                 break;
  98
  99         default:
 100                 DRM_ERROR("Invalid/Unknown vendor OUI\n");
 101                 return false;
 102         }
 103
 104         return true;
 105 }
 106
 107 static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
 108 {
 109         enum drm_lspcon_mode current_mode;
 110         struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
 111
 112         if (drm_lspcon_get_mode(adapter, &current_mode)) {
 113                 DRM_DEBUG_KMS("Error reading LSPCON mode\n");
 114                 return DRM_LSPCON_MODE_INVALID;
 115         }
 116         return current_mode;
 117 }
 118
 119 static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
 120                                              enum drm_lspcon_mode mode)
 121 {
 122         enum drm_lspcon_mode current_mode;
 123
 124         current_mode = lspcon_get_current_mode(lspcon);
 125         if (current_mode == mode)
 126                 goto out;
 127
 128         DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n",
 129                       lspcon_mode_name(mode));
 130
 131         wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 400);
 132         if (current_mode != mode)
 133                 DRM_ERROR("LSPCON mode hasn't settled\n");
 134
 135 out:
 136         DRM_DEBUG_KMS("Current LSPCON mode %s\n",
 137                       lspcon_mode_name(current_mode));
 138
 139         return current_mode;
 140 }
 141
 142 static int lspcon_change_mode(struct intel_lspcon *lspcon,
 143                               enum drm_lspcon_mode mode)
 144 {
 145         int err;
 146         enum drm_lspcon_mode current_mode;
 147         struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
 148
 149         err = drm_lspcon_get_mode(adapter, &current_mode);
 150         if (err) {
 151                 DRM_ERROR("Error reading LSPCON mode\n");
 152                 return err;
 153         }
 154
 155         if (current_mode == mode) {
 156                 DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n");
 157                 return 0;
 158         }
 159
 160         err = drm_lspcon_set_mode(adapter, mode);
 161         if (err < 0) {
 162                 DRM_ERROR("LSPCON mode change failed\n");
 163                 return err;
 164         }
 165
 166         lspcon->mode = mode;
 167         DRM_DEBUG_KMS("LSPCON mode changed done\n");
 168         return 0;
 169 }
 170
 171 static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon)
 172 {
 173         u8 rev;
 174
 175         if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV,
 176                               &rev) != 1) {
 177                 DRM_DEBUG_KMS("Native AUX CH down\n");
 178                 return false;
 179         }
 180
 181         DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n",
 182                       rev >> 4, rev & 0xf);
 183
 184         return true;
 185 }
 186
 187 static bool lspcon_probe(struct intel_lspcon *lspcon)
 188 {
 189         int retry;
 190         enum drm_dp_dual_mode_type adaptor_type;
 191         struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
 192         enum drm_lspcon_mode expected_mode;
 193
 194         expected_mode = lspcon_wake_native_aux_ch(lspcon) ?
 195                         DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS;
 196
 197         /* Lets probe the adaptor and check its type */
 198         for (retry = 0; retry < 6; retry++) {
 199                 if (retry)
 200                         usleep_range(500, 1000);
 201
 202                 adaptor_type = drm_dp_dual_mode_detect(adapter);
 203                 if (adaptor_type == DRM_DP_DUAL_MODE_LSPCON)
 204                         break;
 205         }
 206
 207         if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) {
 208                 DRM_DEBUG_KMS("No LSPCON detected, found %s\n",
 209                                drm_dp_get_dual_mode_type_name(adaptor_type));
 210                 return false;
 211         }
 212
 213         /* Yay ... got a LSPCON device */
 214         DRM_DEBUG_KMS("LSPCON detected\n");
 215         lspcon->mode = lspcon_wait_mode(lspcon, expected_mode);
 216
 217         /*
 218          * In the SW state machine, lets Put LSPCON in PCON mode only.
 219          * In this way, it will work with both HDMI 1.4 sinks as well as HDMI
 220          * 2.0 sinks.
 221          */
 222         if (lspcon->mode != DRM_LSPCON_MODE_PCON) {
 223                 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON) < 0) {
 224                         DRM_ERROR("LSPCON mode change to PCON failed\n");
 225                         return false;
 226                 }
 227         }
 228         return true;
 229 }
 230
 231 static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
 232 {
 233         struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
 234         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 235         unsigned long start = jiffies;
 236
 237         while (1) {
 238                 if (intel_digital_port_connected(&dig_port->base)) {
 239                         DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %u ms\n",
 240                                       jiffies_to_msecs(jiffies - start));
 241                         return;
 242                 }
 243
 244                 if (time_after(jiffies, start + msecs_to_jiffies(1000)))
 245                         break;
 246
 247                 usleep_range(10000, 15000);
 248         }
 249
 250         DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n");
 251 }
 252
 253 static bool lspcon_parade_fw_ready(struct drm_dp_aux *aux)
 254 {
 255         u8 avi_if_ctrl;
 256         u8 retry;
 257         ssize_t ret;
 258
 259         /* Check if LSPCON FW is ready for data */
 260         for (retry = 0; retry < 5; retry++) {
 261                 if (retry)
 262                         usleep_range(200, 300);
 263
 264                 ret = drm_dp_dpcd_read(aux, LSPCON_PARADE_AVI_IF_CTRL,
 265                                        &avi_if_ctrl, 1);
 266                 if (ret < 0) {
 267                         DRM_ERROR("Failed to read AVI IF control\n");
 268                         return false;
 269                 }
 270
 271                 if ((avi_if_ctrl & LSPCON_PARADE_AVI_IF_KICKOFF) == 0)
 272                         return true;
 273         }
 274
 275         DRM_ERROR("Parade FW not ready to accept AVI IF\n");
 276         return false;
 277 }
 278
 279 static bool _lspcon_parade_write_infoframe_blocks(struct drm_dp_aux *aux,
 280                                                   u8 *avi_buf)
 281 {
 282         u8 avi_if_ctrl;
 283         u8 block_count = 0;
 284         u8 *data;
 285         u16 reg;
 286         ssize_t ret;
 287
 288         while (block_count < 4) {
 289                 if (!lspcon_parade_fw_ready(aux)) {
 290                         DRM_DEBUG_KMS("LSPCON FW not ready, block %d\n",
 291                                       block_count);
 292                         return false;
 293                 }
 294
 295                 reg = LSPCON_PARADE_AVI_IF_WRITE_OFFSET;
 296                 data = avi_buf + block_count * 8;
 297                 ret = drm_dp_dpcd_write(aux, reg, data, 8);
 298                 if (ret < 0) {
 299                         DRM_ERROR("Failed to write AVI IF block %d\n",
 300                                   block_count);
 301                         return false;
 302                 }
 303
 304                 /*
 305                  * Once a block of data is written, we have to inform the FW
 306                  * about this by writing into avi infoframe control register:
 307                  * - set the kickoff bit[7] to 1
 308                  * - write the block no. to bits[1:0]
 309                  */
 310                 reg = LSPCON_PARADE_AVI_IF_CTRL;
 311                 avi_if_ctrl = LSPCON_PARADE_AVI_IF_KICKOFF | block_count;
 312                 ret = drm_dp_dpcd_write(aux, reg, &avi_if_ctrl, 1);
 313                 if (ret < 0) {
 314                         DRM_ERROR("Failed to update (0x%x), block %d\n",
 315                                   reg, block_count);
 316                         return false;
 317                 }
 318
 319                 block_count++;
 320         }
 321
 322         DRM_DEBUG_KMS("Wrote AVI IF blocks successfully\n");
 323         return true;
 324 }
 325
 326 static bool _lspcon_write_avi_infoframe_parade(struct drm_dp_aux *aux,
 327                                                const u8 *frame,
 328                                                ssize_t len)
 329 {
 330         u8 avi_if[LSPCON_PARADE_AVI_IF_DATA_SIZE] = {1, };
 331
 332         /*
 333          * Parade's frames contains 32 bytes of data, divided
 334          * into 4 frames:
 335          *      Token byte (first byte of first frame, must be non-zero)
 336          *      HB0 to HB2       from AVI IF (3 bytes header)
 337          *      PB0 to PB27 from AVI IF (28 bytes data)
 338          * So it should look like this
 339          *      first block: | <token> <HB0-HB2> <DB0-DB3> |
 340          *      next 3 blocks: |<DB4-DB11>|<DB12-DB19>|<DB20-DB28>|
 341          */
 342
 343         if (len > LSPCON_PARADE_AVI_IF_DATA_SIZE - 1) {
 344                 DRM_ERROR("Invalid length of infoframes\n");
 345                 return false;
 346         }
 347
 348         memcpy(&avi_if[1], frame, len);
 349
 350         if (!_lspcon_parade_write_infoframe_blocks(aux, avi_if)) {
 351                 DRM_DEBUG_KMS("Failed to write infoframe blocks\n");
 352                 return false;
 353         }
 354
 355         return true;
 356 }
 357
 358 static bool _lspcon_write_avi_infoframe_mca(struct drm_dp_aux *aux,
 359                                             const u8 *buffer, ssize_t len)
 360 {
 361         int ret;
 362         u32 val = 0;
 363         u32 retry;
 364         u16 reg;
 365         const u8 *data = buffer;
 366
 367         reg = LSPCON_MCA_AVI_IF_WRITE_OFFSET;
 368         while (val < len) {
 369                 /* DPCD write for AVI IF can fail on a slow FW day, so retry */
 370                 for (retry = 0; retry < 5; retry++) {
 371                         ret = drm_dp_dpcd_write(aux, reg, (void *)data, 1);
 372                         if (ret == 1) {
 373                                 break;
 374                         } else if (retry < 4) {
 375                                 mdelay(50);
 376                                 continue;
 377                         } else {
 378                                 DRM_ERROR("DPCD write failed at:0x%x\n", reg);
 379                                 return false;
 380                         }
 381                 }
 382                 val++; reg++; data++;
 383         }
 384
 385         val = 0;
 386         reg = LSPCON_MCA_AVI_IF_CTRL;
 387         ret = drm_dp_dpcd_read(aux, reg, &val, 1);
 388         if (ret < 0) {
 389                 DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
 390                 return false;
 391         }
 392
 393         /* Indicate LSPCON chip about infoframe, clear bit 1 and set bit 0 */
 394         val &= ~LSPCON_MCA_AVI_IF_HANDLED;
 395         val |= LSPCON_MCA_AVI_IF_KICKOFF;
 396
 397         ret = drm_dp_dpcd_write(aux, reg, &val, 1);
 398         if (ret < 0) {
 399                 DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
 400                 return false;
 401         }
 402
 403         val = 0;
 404         ret = drm_dp_dpcd_read(aux, reg, &val, 1);
 405         if (ret < 0) {
 406                 DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
 407                 return false;
 408         }
 409
 410         if (val == LSPCON_MCA_AVI_IF_HANDLED)
 411                 DRM_DEBUG_KMS("AVI IF handled by FW\n");
 412
 413         return true;
 414 }
 415
 416 void lspcon_write_infoframe(struct intel_encoder *encoder,
 417                             const struct intel_crtc_state *crtc_state,
 418                             unsigned int type,
 419                             const void *frame, ssize_t len)
 420 {
 421         bool ret;
 422         struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 423         struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);
 424
 425         /* LSPCON only needs AVI IF */
 426         if (type != HDMI_INFOFRAME_TYPE_AVI)
 427                 return;
 428
 429         if (lspcon->vendor == LSPCON_VENDOR_MCA)
 430                 ret = _lspcon_write_avi_infoframe_mca(&intel_dp->aux,
 431                                                       frame, len);
 432         else
 433                 ret = _lspcon_write_avi_infoframe_parade(&intel_dp->aux,
 434                                                          frame, len);
 435
 436         if (!ret) {
 437                 DRM_ERROR("Failed to write AVI infoframes\n");
 438                 return;
 439         }
 440
 441         DRM_DEBUG_DRIVER("AVI infoframes updated successfully\n");
 442 }
 443
 444 void lspcon_read_infoframe(struct intel_encoder *encoder,
 445                            const struct intel_crtc_state *crtc_state,
 446                            unsigned int type,
 447                            void *frame, ssize_t len)
 448 {
 449         /* FIXME implement this */
 450 }
 451
 452 void lspcon_set_infoframes(struct intel_encoder *encoder,
 453                            bool enable,
 454                            const struct intel_crtc_state *crtc_state,
 455                            const struct drm_connector_state *conn_state)
 456 {
 457         ssize_t ret;
 458         union hdmi_infoframe frame;
 459         u8 buf[VIDEO_DIP_DATA_SIZE];
 460         struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
 461         struct intel_lspcon *lspcon = &dig_port->lspcon;
 462         const struct drm_display_mode *adjusted_mode =
 463                 &crtc_state->hw.adjusted_mode;
 464
 465         if (!lspcon->active) {
 466                 DRM_ERROR("Writing infoframes while LSPCON disabled ?\n");
 467                 return;
 468         }
 469
 470         /* FIXME precompute infoframes */
 471
 472         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
 473                                                        conn_state->connector,
 474                                                        adjusted_mode);
 475         if (ret < 0) {
 476                 DRM_ERROR("couldn't fill AVI infoframe\n");
 477                 return;
 478         }
 479
 480         /*
 481          * Currently there is no interface defined to
 482          * check user preference between RGB/YCBCR444
 483          * or YCBCR420. So the only possible case for
 484          * YCBCR444 usage is driving YCBCR420 output
 485          * with LSPCON, when pipe is configured for
 486          * YCBCR444 output and LSPCON takes care of
 487          * downsampling it.
 488          */
 489         if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444)
 490                 frame.avi.colorspace = HDMI_COLORSPACE_YUV420;
 491         else
 492                 frame.avi.colorspace = HDMI_COLORSPACE_RGB;
 493
 494         drm_hdmi_avi_infoframe_quant_range(&frame.avi,
 495                                            conn_state->connector,
 496                                            adjusted_mode,
 497                                            crtc_state->limited_color_range ?
 498                                            HDMI_QUANTIZATION_RANGE_LIMITED :
 499                                            HDMI_QUANTIZATION_RANGE_FULL);
 500
 501         ret = hdmi_infoframe_pack(&frame, buf, sizeof(buf));
 502         if (ret < 0) {
 503                 DRM_ERROR("Failed to pack AVI IF\n");
 504                 return;
 505         }
 506
 507         dig_port->write_infoframe(encoder, crtc_state, HDMI_INFOFRAME_TYPE_AVI,
 508                                   buf, ret);
 509 }
 510
 511 u32 lspcon_infoframes_enabled(struct intel_encoder *encoder,
 512                               const struct intel_crtc_state *pipe_config)
 513 {
 514         /* FIXME actually read this from the hw */
 515         return 0;
 516 }
 517
 518 void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon)
 519 {
 520         lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON);
 521 }
 522
 523 static bool lspcon_init(struct intel_digital_port *dig_port)
 524 {
 525         struct intel_dp *dp = &dig_port->dp;
 526         struct intel_lspcon *lspcon = &dig_port->lspcon;
 527         struct drm_connector *connector = &dp->attached_connector->base;
 528
 529         lspcon->active = false;
 530         lspcon->mode = DRM_LSPCON_MODE_INVALID;
 531
 532         if (!lspcon_probe(lspcon)) {
 533                 DRM_ERROR("Failed to probe lspcon\n");
 534                 return false;
 535         }
 536
 537         if (drm_dp_read_dpcd_caps(&dp->aux, dp->dpcd) != 0) {
 538                 DRM_ERROR("LSPCON DPCD read failed\n");
 539                 return false;
 540         }
 541
 542         if (!lspcon_detect_vendor(lspcon)) {
 543                 DRM_ERROR("LSPCON vendor detection failed\n");
 544                 return false;
 545         }
 546
 547         connector->ycbcr_420_allowed = true;
 548         lspcon->active = true;
 549         DRM_DEBUG_KMS("Success: LSPCON init\n");
 550         return true;
 551 }
 552
 553 void lspcon_resume(struct intel_digital_port *dig_port)
 554 {
 555         struct intel_lspcon *lspcon = &dig_port->lspcon;
 556         struct drm_device *dev = dig_port->base.base.dev;
 557         struct drm_i915_private *dev_priv = to_i915(dev);
 558         enum drm_lspcon_mode expected_mode;
 559
 560         if (!intel_bios_is_lspcon_present(dev_priv, dig_port->base.port))
 561                 return;
 562
 563         if (!lspcon->active) {
 564                 if (!lspcon_init(dig_port)) {
 565                         DRM_ERROR("LSPCON init failed on port %c\n",
 566                                   port_name(dig_port->base.port));
 567                         return;
 568                 }
 569         }
 570
 571         if (lspcon_wake_native_aux_ch(lspcon)) {
 572                 expected_mode = DRM_LSPCON_MODE_PCON;
 573                 lspcon_resume_in_pcon_wa(lspcon);
 574         } else {
 575                 expected_mode = DRM_LSPCON_MODE_LS;
 576         }
 577
 578         if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON)
 579                 return;
 580
 581         if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON))
 582                 DRM_ERROR("LSPCON resume failed\n");
 583         else
 584                 DRM_DEBUG_KMS("LSPCON resume success\n");
 585 }