drivers/gpu/drm/i915/intel_dsi.c

   1 /*
   2  * Copyright © 2013 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  * Author: Jani Nikula <[email protected]>
  24  */
  25
  26 #include <drm/drmP.h>
  27 #include <drm/drm_atomic_helper.h>
  28 #include <drm/drm_crtc.h>
  29 #include <drm/drm_edid.h>
  30 #include <drm/i915_drm.h>
  31 #include <drm/drm_panel.h>
  32 #include <drm/drm_mipi_dsi.h>
  33 #include <linux/slab.h>
  34 #include <linux/gpio/consumer.h>
  35 #include "i915_drv.h"
  36 #include "intel_drv.h"
  37 #include "intel_dsi.h"
  38
  39 static const struct {
  40         u16 panel_id;
  41         struct drm_panel * (*init)(struct intel_dsi *intel_dsi, u16 panel_id);
  42 } intel_dsi_drivers[] = {
  43         {
  44                 .panel_id = MIPI_DSI_GENERIC_PANEL_ID,
  45                 .init = vbt_panel_init,
  46         },
  47 };
  48
  49 /* return pixels in terms of txbyteclkhs */
  50 static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count,
  51                        u16 burst_mode_ratio)
  52 {
  53         return DIV_ROUND_UP(DIV_ROUND_UP(pixels * bpp * burst_mode_ratio,
  54                                          8 * 100), lane_count);
  55 }
  56
  57 /* return pixels equvalent to txbyteclkhs */
  58 static u16 pixels_from_txbyteclkhs(u16 clk_hs, int bpp, int lane_count,
  59                         u16 burst_mode_ratio)
  60 {
  61         return DIV_ROUND_UP((clk_hs * lane_count * 8 * 100),
  62                                                 (bpp * burst_mode_ratio));
  63 }
  64
  65 enum mipi_dsi_pixel_format pixel_format_from_register_bits(u32 fmt)
  66 {
  67         /* It just so happens the VBT matches register contents. */
  68         switch (fmt) {
  69         case VID_MODE_FORMAT_RGB888:
  70                 return MIPI_DSI_FMT_RGB888;
  71         case VID_MODE_FORMAT_RGB666:
  72                 return MIPI_DSI_FMT_RGB666;
  73         case VID_MODE_FORMAT_RGB666_PACKED:
  74                 return MIPI_DSI_FMT_RGB666_PACKED;
  75         case VID_MODE_FORMAT_RGB565:
  76                 return MIPI_DSI_FMT_RGB565;
  77         default:
  78                 MISSING_CASE(fmt);
  79                 return MIPI_DSI_FMT_RGB666;
  80         }
  81 }
  82
  83 static void wait_for_dsi_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
  84 {
  85         struct drm_encoder *encoder = &intel_dsi->base.base;
  86         struct drm_device *dev = encoder->dev;
  87         struct drm_i915_private *dev_priv = to_i915(dev);
  88         u32 mask;
  89
  90         mask = LP_CTRL_FIFO_EMPTY | HS_CTRL_FIFO_EMPTY |
  91                 LP_DATA_FIFO_EMPTY | HS_DATA_FIFO_EMPTY;
  92
  93         if (intel_wait_for_register(dev_priv,
  94                                     MIPI_GEN_FIFO_STAT(port), mask, mask,
  95                                     100))
  96                 DRM_ERROR("DPI FIFOs are not empty\n");
  97 }
  98
  99 static void write_data(struct drm_i915_private *dev_priv,
 100                        i915_reg_t reg,
 101                        const u8 *data, u32 len)
 102 {
 103         u32 i, j;
 104
 105         for (i = 0; i < len; i += 4) {
 106                 u32 val = 0;
 107
 108                 for (j = 0; j < min_t(u32, len - i, 4); j++)
 109                         val |= *data++ << 8 * j;
 110
 111                 I915_WRITE(reg, val);
 112         }
 113 }
 114
 115 static void read_data(struct drm_i915_private *dev_priv,
 116                       i915_reg_t reg,
 117                       u8 *data, u32 len)
 118 {
 119         u32 i, j;
 120
 121         for (i = 0; i < len; i += 4) {
 122                 u32 val = I915_READ(reg);
 123
 124                 for (j = 0; j < min_t(u32, len - i, 4); j++)
 125                         *data++ = val >> 8 * j;
 126         }
 127 }
 128
 129 static ssize_t intel_dsi_host_transfer(struct mipi_dsi_host *host,
 130                                        const struct mipi_dsi_msg *msg)
 131 {
 132         struct intel_dsi_host *intel_dsi_host = to_intel_dsi_host(host);
 133         struct drm_device *dev = intel_dsi_host->intel_dsi->base.base.dev;
 134         struct drm_i915_private *dev_priv = to_i915(dev);
 135         enum port port = intel_dsi_host->port;
 136         struct mipi_dsi_packet packet;
 137         ssize_t ret;
 138         const u8 *header, *data;
 139         i915_reg_t data_reg, ctrl_reg;
 140         u32 data_mask, ctrl_mask;
 141
 142         ret = mipi_dsi_create_packet(&packet, msg);
 143         if (ret < 0)
 144                 return ret;
 145
 146         header = packet.header;
 147         data = packet.payload;
 148
 149         if (msg->flags & MIPI_DSI_MSG_USE_LPM) {
 150                 data_reg = MIPI_LP_GEN_DATA(port);
 151                 data_mask = LP_DATA_FIFO_FULL;
 152                 ctrl_reg = MIPI_LP_GEN_CTRL(port);
 153                 ctrl_mask = LP_CTRL_FIFO_FULL;
 154         } else {
 155                 data_reg = MIPI_HS_GEN_DATA(port);
 156                 data_mask = HS_DATA_FIFO_FULL;
 157                 ctrl_reg = MIPI_HS_GEN_CTRL(port);
 158                 ctrl_mask = HS_CTRL_FIFO_FULL;
 159         }
 160
 161         /* note: this is never true for reads */
 162         if (packet.payload_length) {
 163                 if (intel_wait_for_register(dev_priv,
 164                                             MIPI_GEN_FIFO_STAT(port),
 165                                             data_mask, 0,
 166                                             50))
 167                         DRM_ERROR("Timeout waiting for HS/LP DATA FIFO !full\n");
 168
 169                 write_data(dev_priv, data_reg, packet.payload,
 170                            packet.payload_length);
 171         }
 172
 173         if (msg->rx_len) {
 174                 I915_WRITE(MIPI_INTR_STAT(port), GEN_READ_DATA_AVAIL);
 175         }
 176
 177         if (intel_wait_for_register(dev_priv,
 178                                     MIPI_GEN_FIFO_STAT(port),
 179                                     ctrl_mask, 0,
 180                                     50)) {
 181                 DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n");
 182         }
 183
 184         I915_WRITE(ctrl_reg, header[2] << 16 | header[1] << 8 | header[0]);
 185
 186         /* ->rx_len is set only for reads */
 187         if (msg->rx_len) {
 188                 data_mask = GEN_READ_DATA_AVAIL;
 189                 if (intel_wait_for_register(dev_priv,
 190                                             MIPI_INTR_STAT(port),
 191                                             data_mask, data_mask,
 192                                             50))
 193                         DRM_ERROR("Timeout waiting for read data.\n");
 194
 195                 read_data(dev_priv, data_reg, msg->rx_buf, msg->rx_len);
 196         }
 197
 198         /* XXX: fix for reads and writes */
 199         return 4 + packet.payload_length;
 200 }
 201
 202 static int intel_dsi_host_attach(struct mipi_dsi_host *host,
 203                                  struct mipi_dsi_device *dsi)
 204 {
 205         return 0;
 206 }
 207
 208 static int intel_dsi_host_detach(struct mipi_dsi_host *host,
 209                                  struct mipi_dsi_device *dsi)
 210 {
 211         return 0;
 212 }
 213
 214 static const struct mipi_dsi_host_ops intel_dsi_host_ops = {
 215         .attach = intel_dsi_host_attach,
 216         .detach = intel_dsi_host_detach,
 217         .transfer = intel_dsi_host_transfer,
 218 };
 219
 220 static struct intel_dsi_host *intel_dsi_host_init(struct intel_dsi *intel_dsi,
 221                                                   enum port port)
 222 {
 223         struct intel_dsi_host *host;
 224         struct mipi_dsi_device *device;
 225
 226         host = kzalloc(sizeof(*host), GFP_KERNEL);
 227         if (!host)
 228                 return NULL;
 229
 230         host->base.ops = &intel_dsi_host_ops;
 231         host->intel_dsi = intel_dsi;
 232         host->port = port;
 233
 234         /*
 235          * We should call mipi_dsi_host_register(&host->base) here, but we don't
 236          * have a host->dev, and we don't have OF stuff either. So just use the
 237          * dsi framework as a library and hope for the best. Create the dsi
 238          * devices by ourselves here too. Need to be careful though, because we
 239          * don't initialize any of the driver model devices here.
 240          */
 241         device = kzalloc(sizeof(*device), GFP_KERNEL);
 242         if (!device) {
 243                 kfree(host);
 244                 return NULL;
 245         }
 246
 247         device->host = &host->base;
 248         host->device = device;
 249
 250         return host;
 251 }
 252
 253 /*
 254  * send a video mode command
 255  *
 256  * XXX: commands with data in MIPI_DPI_DATA?
 257  */
 258 static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,
 259                         enum port port)
 260 {
 261         struct drm_encoder *encoder = &intel_dsi->base.base;
 262         struct drm_device *dev = encoder->dev;
 263         struct drm_i915_private *dev_priv = to_i915(dev);
 264         u32 mask;
 265
 266         /* XXX: pipe, hs */
 267         if (hs)
 268                 cmd &= ~DPI_LP_MODE;
 269         else
 270                 cmd |= DPI_LP_MODE;
 271
 272         /* clear bit */
 273         I915_WRITE(MIPI_INTR_STAT(port), SPL_PKT_SENT_INTERRUPT);
 274
 275         /* XXX: old code skips write if control unchanged */
 276         if (cmd == I915_READ(MIPI_DPI_CONTROL(port)))
 277                 DRM_ERROR("Same special packet %02x twice in a row.\n", cmd);
 278
 279         I915_WRITE(MIPI_DPI_CONTROL(port), cmd);
 280
 281         mask = SPL_PKT_SENT_INTERRUPT;
 282         if (intel_wait_for_register(dev_priv,
 283                                     MIPI_INTR_STAT(port), mask, mask,
 284                                     100))
 285                 DRM_ERROR("Video mode command 0x%08x send failed.\n", cmd);
 286
 287         return 0;
 288 }
 289
 290 static void band_gap_reset(struct drm_i915_private *dev_priv)
 291 {
 292         mutex_lock(&dev_priv->sb_lock);
 293
 294         vlv_flisdsi_write(dev_priv, 0x08, 0x0001);
 295         vlv_flisdsi_write(dev_priv, 0x0F, 0x0005);
 296         vlv_flisdsi_write(dev_priv, 0x0F, 0x0025);
 297         udelay(150);
 298         vlv_flisdsi_write(dev_priv, 0x0F, 0x0000);
 299         vlv_flisdsi_write(dev_priv, 0x08, 0x0000);
 300
 301         mutex_unlock(&dev_priv->sb_lock);
 302 }
 303
 304 static inline bool is_vid_mode(struct intel_dsi *intel_dsi)
 305 {
 306         return intel_dsi->operation_mode == INTEL_DSI_VIDEO_MODE;
 307 }
 308
 309 static inline bool is_cmd_mode(struct intel_dsi *intel_dsi)
 310 {
 311         return intel_dsi->operation_mode == INTEL_DSI_COMMAND_MODE;
 312 }
 313
 314 static bool intel_dsi_compute_config(struct intel_encoder *encoder,
 315                                      struct intel_crtc_state *pipe_config,
 316                                      struct drm_connector_state *conn_state)
 317 {
 318         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 319         struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
 320                                                    base);
 321         struct intel_connector *intel_connector = intel_dsi->attached_connector;
 322         struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 323         const struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 324         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 325         int ret;
 326
 327         DRM_DEBUG_KMS("\n");
 328
 329         if (fixed_mode) {
 330                 intel_fixed_panel_mode(fixed_mode, adjusted_mode);
 331
 332                 if (HAS_GMCH_DISPLAY(dev_priv))
 333                         intel_gmch_panel_fitting(crtc, pipe_config,
 334                                                  intel_connector->panel.fitting_mode);
 335                 else
 336                         intel_pch_panel_fitting(crtc, pipe_config,
 337                                                 intel_connector->panel.fitting_mode);
 338         }
 339
 340         /* DSI uses short packets for sync events, so clear mode flags for DSI */
 341         adjusted_mode->flags = 0;
 342
 343         if (IS_BROXTON(dev_priv)) {
 344                 /* Dual link goes to DSI transcoder A. */
 345                 if (intel_dsi->ports == BIT(PORT_C))
 346                         pipe_config->cpu_transcoder = TRANSCODER_DSI_C;
 347                 else
 348                         pipe_config->cpu_transcoder = TRANSCODER_DSI_A;
 349         }
 350
 351         ret = intel_compute_dsi_pll(encoder, pipe_config);
 352         if (ret)
 353                 return false;
 354
 355         pipe_config->clock_set = true;
 356
 357         return true;
 358 }
 359
 360 static void bxt_dsi_device_ready(struct intel_encoder *encoder)
 361 {
 362         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 363         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 364         enum port port;
 365         u32 val;
 366
 367         DRM_DEBUG_KMS("\n");
 368
 369         /* Exit Low power state in 4 steps*/
 370         for_each_dsi_port(port, intel_dsi->ports) {
 371
 372                 /* 1. Enable MIPI PHY transparent latch */
 373                 val = I915_READ(BXT_MIPI_PORT_CTRL(port));
 374                 I915_WRITE(BXT_MIPI_PORT_CTRL(port), val | LP_OUTPUT_HOLD);
 375                 usleep_range(2000, 2500);
 376
 377                 /* 2. Enter ULPS */
 378                 val = I915_READ(MIPI_DEVICE_READY(port));
 379                 val &= ~ULPS_STATE_MASK;
 380                 val |= (ULPS_STATE_ENTER | DEVICE_READY);
 381                 I915_WRITE(MIPI_DEVICE_READY(port), val);
 382                 usleep_range(2, 3);
 383
 384                 /* 3. Exit ULPS */
 385                 val = I915_READ(MIPI_DEVICE_READY(port));
 386                 val &= ~ULPS_STATE_MASK;
 387                 val |= (ULPS_STATE_EXIT | DEVICE_READY);
 388                 I915_WRITE(MIPI_DEVICE_READY(port), val);
 389                 usleep_range(1000, 1500);
 390
 391                 /* Clear ULPS and set device ready */
 392                 val = I915_READ(MIPI_DEVICE_READY(port));
 393                 val &= ~ULPS_STATE_MASK;
 394                 val |= DEVICE_READY;
 395                 I915_WRITE(MIPI_DEVICE_READY(port), val);
 396         }
 397 }
 398
 399 static void vlv_dsi_device_ready(struct intel_encoder *encoder)
 400 {
 401         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 402         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 403         enum port port;
 404         u32 val;
 405
 406         DRM_DEBUG_KMS("\n");
 407
 408         mutex_lock(&dev_priv->sb_lock);
 409         /* program rcomp for compliance, reduce from 50 ohms to 45 ohms
 410          * needed everytime after power gate */
 411         vlv_flisdsi_write(dev_priv, 0x04, 0x0004);
 412         mutex_unlock(&dev_priv->sb_lock);
 413
 414         /* bandgap reset is needed after everytime we do power gate */
 415         band_gap_reset(dev_priv);
 416
 417         for_each_dsi_port(port, intel_dsi->ports) {
 418
 419                 I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_ENTER);
 420                 usleep_range(2500, 3000);
 421
 422                 /* Enable MIPI PHY transparent latch
 423                  * Common bit for both MIPI Port A & MIPI Port C
 424                  * No similar bit in MIPI Port C reg
 425                  */
 426                 val = I915_READ(MIPI_PORT_CTRL(PORT_A));
 427                 I915_WRITE(MIPI_PORT_CTRL(PORT_A), val | LP_OUTPUT_HOLD);
 428                 usleep_range(1000, 1500);
 429
 430                 I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_EXIT);
 431                 usleep_range(2500, 3000);
 432
 433                 I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY);
 434                 usleep_range(2500, 3000);
 435         }
 436 }
 437
 438 static void intel_dsi_device_ready(struct intel_encoder *encoder)
 439 {
 440         struct drm_device *dev = encoder->base.dev;
 441
 442         if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
 443                 vlv_dsi_device_ready(encoder);
 444         else if (IS_BROXTON(dev))
 445                 bxt_dsi_device_ready(encoder);
 446 }
 447
 448 static void intel_dsi_port_enable(struct intel_encoder *encoder)
 449 {
 450         struct drm_device *dev = encoder->base.dev;
 451         struct drm_i915_private *dev_priv = to_i915(dev);
 452         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 453         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 454         enum port port;
 455
 456         if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
 457                 u32 temp;
 458
 459                 temp = I915_READ(VLV_CHICKEN_3);
 460                 temp &= ~PIXEL_OVERLAP_CNT_MASK |
 461                                         intel_dsi->pixel_overlap <<
 462                                         PIXEL_OVERLAP_CNT_SHIFT;
 463                 I915_WRITE(VLV_CHICKEN_3, temp);
 464         }
 465
 466         for_each_dsi_port(port, intel_dsi->ports) {
 467                 i915_reg_t port_ctrl = IS_BROXTON(dev) ?
 468                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
 469                 u32 temp;
 470
 471                 temp = I915_READ(port_ctrl);
 472
 473                 temp &= ~LANE_CONFIGURATION_MASK;
 474                 temp &= ~DUAL_LINK_MODE_MASK;
 475
 476                 if (intel_dsi->ports == (BIT(PORT_A) | BIT(PORT_C))) {
 477                         temp |= (intel_dsi->dual_link - 1)
 478                                                 << DUAL_LINK_MODE_SHIFT;
 479                         temp |= intel_crtc->pipe ?
 480                                         LANE_CONFIGURATION_DUAL_LINK_B :
 481                                         LANE_CONFIGURATION_DUAL_LINK_A;
 482                 }
 483                 /* assert ip_tg_enable signal */
 484                 I915_WRITE(port_ctrl, temp | DPI_ENABLE);
 485                 POSTING_READ(port_ctrl);
 486         }
 487 }
 488
 489 static void intel_dsi_port_disable(struct intel_encoder *encoder)
 490 {
 491         struct drm_device *dev = encoder->base.dev;
 492         struct drm_i915_private *dev_priv = to_i915(dev);
 493         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 494         enum port port;
 495
 496         for_each_dsi_port(port, intel_dsi->ports) {
 497                 i915_reg_t port_ctrl = IS_BROXTON(dev) ?
 498                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
 499                 u32 temp;
 500
 501                 /* de-assert ip_tg_enable signal */
 502                 temp = I915_READ(port_ctrl);
 503                 I915_WRITE(port_ctrl, temp & ~DPI_ENABLE);
 504                 POSTING_READ(port_ctrl);
 505         }
 506 }
 507
 508 static void intel_dsi_enable(struct intel_encoder *encoder)
 509 {
 510         struct drm_device *dev = encoder->base.dev;
 511         struct drm_i915_private *dev_priv = to_i915(dev);
 512         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 513         enum port port;
 514
 515         DRM_DEBUG_KMS("\n");
 516
 517         if (is_cmd_mode(intel_dsi)) {
 518                 for_each_dsi_port(port, intel_dsi->ports)
 519                         I915_WRITE(MIPI_MAX_RETURN_PKT_SIZE(port), 8 * 4);
 520         } else {
 521                 msleep(20); /* XXX */
 522                 for_each_dsi_port(port, intel_dsi->ports)
 523                         dpi_send_cmd(intel_dsi, TURN_ON, false, port);
 524                 msleep(100);
 525
 526                 drm_panel_enable(intel_dsi->panel);
 527
 528                 for_each_dsi_port(port, intel_dsi->ports)
 529                         wait_for_dsi_fifo_empty(intel_dsi, port);
 530
 531                 intel_dsi_port_enable(encoder);
 532         }
 533
 534         intel_panel_enable_backlight(intel_dsi->attached_connector);
 535 }
 536
 537 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
 538                               struct intel_crtc_state *pipe_config);
 539
 540 static void intel_dsi_pre_enable(struct intel_encoder *encoder,
 541                                  struct intel_crtc_state *pipe_config,
 542                                  struct drm_connector_state *conn_state)
 543 {
 544         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 545         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 546         enum port port;
 547
 548         DRM_DEBUG_KMS("\n");
 549
 550         /*
 551          * The BIOS may leave the PLL in a wonky state where it doesn't
 552          * lock. It needs to be fully powered down to fix it.
 553          */
 554         intel_disable_dsi_pll(encoder);
 555         intel_enable_dsi_pll(encoder, pipe_config);
 556
 557         intel_dsi_prepare(encoder, pipe_config);
 558
 559         /* Panel Enable over CRC PMIC */
 560         if (intel_dsi->gpio_panel)
 561                 gpiod_set_value_cansleep(intel_dsi->gpio_panel, 1);
 562
 563         msleep(intel_dsi->panel_on_delay);
 564
 565         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 566                 u32 val;
 567
 568                 /* Disable DPOunit clock gating, can stall pipe */
 569                 val = I915_READ(DSPCLK_GATE_D);
 570                 val |= DPOUNIT_CLOCK_GATE_DISABLE;
 571                 I915_WRITE(DSPCLK_GATE_D, val);
 572         }
 573
 574         /* put device in ready state */
 575         intel_dsi_device_ready(encoder);
 576
 577         drm_panel_prepare(intel_dsi->panel);
 578
 579         for_each_dsi_port(port, intel_dsi->ports)
 580                 wait_for_dsi_fifo_empty(intel_dsi, port);
 581
 582         /* Enable port in pre-enable phase itself because as per hw team
 583          * recommendation, port should be enabled befor plane & pipe */
 584         intel_dsi_enable(encoder);
 585 }
 586
 587 static void intel_dsi_enable_nop(struct intel_encoder *encoder,
 588                                  struct intel_crtc_state *pipe_config,
 589                                  struct drm_connector_state *conn_state)
 590 {
 591         DRM_DEBUG_KMS("\n");
 592
 593         /* for DSI port enable has to be done before pipe
 594          * and plane enable, so port enable is done in
 595          * pre_enable phase itself unlike other encoders
 596          */
 597 }
 598
 599 static void intel_dsi_pre_disable(struct intel_encoder *encoder,
 600                                   struct intel_crtc_state *old_crtc_state,
 601                                   struct drm_connector_state *old_conn_state)
 602 {
 603         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 604         enum port port;
 605
 606         DRM_DEBUG_KMS("\n");
 607
 608         intel_panel_disable_backlight(intel_dsi->attached_connector);
 609
 610         if (is_vid_mode(intel_dsi)) {
 611                 /* Send Shutdown command to the panel in LP mode */
 612                 for_each_dsi_port(port, intel_dsi->ports)
 613                         dpi_send_cmd(intel_dsi, SHUTDOWN, false, port);
 614                 msleep(10);
 615         }
 616 }
 617
 618 static void intel_dsi_disable(struct intel_encoder *encoder)
 619 {
 620         struct drm_device *dev = encoder->base.dev;
 621         struct drm_i915_private *dev_priv = to_i915(dev);
 622         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 623         enum port port;
 624         u32 temp;
 625
 626         DRM_DEBUG_KMS("\n");
 627
 628         if (is_vid_mode(intel_dsi)) {
 629                 for_each_dsi_port(port, intel_dsi->ports)
 630                         wait_for_dsi_fifo_empty(intel_dsi, port);
 631
 632                 intel_dsi_port_disable(encoder);
 633                 msleep(2);
 634         }
 635
 636         for_each_dsi_port(port, intel_dsi->ports) {
 637                 /* Panel commands can be sent when clock is in LP11 */
 638                 I915_WRITE(MIPI_DEVICE_READY(port), 0x0);
 639
 640                 intel_dsi_reset_clocks(encoder, port);
 641                 I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
 642
 643                 temp = I915_READ(MIPI_DSI_FUNC_PRG(port));
 644                 temp &= ~VID_MODE_FORMAT_MASK;
 645                 I915_WRITE(MIPI_DSI_FUNC_PRG(port), temp);
 646
 647                 I915_WRITE(MIPI_DEVICE_READY(port), 0x1);
 648         }
 649         /* if disable packets are sent before sending shutdown packet then in
 650          * some next enable sequence send turn on packet error is observed */
 651         drm_panel_disable(intel_dsi->panel);
 652
 653         for_each_dsi_port(port, intel_dsi->ports)
 654                 wait_for_dsi_fifo_empty(intel_dsi, port);
 655 }
 656
 657 static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
 658 {
 659         struct drm_device *dev = encoder->base.dev;
 660         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 661         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 662         enum port port;
 663
 664         DRM_DEBUG_KMS("\n");
 665         for_each_dsi_port(port, intel_dsi->ports) {
 666                 /* Common bit for both MIPI Port A & MIPI Port C on VLV/CHV */
 667                 i915_reg_t port_ctrl = IS_BROXTON(dev) ?
 668                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(PORT_A);
 669                 u32 val;
 670
 671                 I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
 672                                                         ULPS_STATE_ENTER);
 673                 usleep_range(2000, 2500);
 674
 675                 I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
 676                                                         ULPS_STATE_EXIT);
 677                 usleep_range(2000, 2500);
 678
 679                 I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
 680                                                         ULPS_STATE_ENTER);
 681                 usleep_range(2000, 2500);
 682
 683                 /* Wait till Clock lanes are in LP-00 state for MIPI Port A
 684                  * only. MIPI Port C has no similar bit for checking
 685                  */
 686                 if (intel_wait_for_register(dev_priv,
 687                                             port_ctrl, AFE_LATCHOUT, 0,
 688                                             30))
 689                         DRM_ERROR("DSI LP not going Low\n");
 690
 691                 /* Disable MIPI PHY transparent latch */
 692                 val = I915_READ(port_ctrl);
 693                 I915_WRITE(port_ctrl, val & ~LP_OUTPUT_HOLD);
 694                 usleep_range(1000, 1500);
 695
 696                 I915_WRITE(MIPI_DEVICE_READY(port), 0x00);
 697                 usleep_range(2000, 2500);
 698         }
 699
 700         intel_disable_dsi_pll(encoder);
 701 }
 702
 703 static void intel_dsi_post_disable(struct intel_encoder *encoder,
 704                                    struct intel_crtc_state *pipe_config,
 705                                    struct drm_connector_state *conn_state)
 706 {
 707         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 708         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 709
 710         DRM_DEBUG_KMS("\n");
 711
 712         intel_dsi_disable(encoder);
 713
 714         intel_dsi_clear_device_ready(encoder);
 715
 716         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 717                 u32 val;
 718
 719                 val = I915_READ(DSPCLK_GATE_D);
 720                 val &= ~DPOUNIT_CLOCK_GATE_DISABLE;
 721                 I915_WRITE(DSPCLK_GATE_D, val);
 722         }
 723
 724         drm_panel_unprepare(intel_dsi->panel);
 725
 726         msleep(intel_dsi->panel_off_delay);
 727
 728         /* Panel Disable over CRC PMIC */
 729         if (intel_dsi->gpio_panel)
 730                 gpiod_set_value_cansleep(intel_dsi->gpio_panel, 0);
 731
 732         /*
 733          * FIXME As we do with eDP, just make a note of the time here
 734          * and perform the wait before the next panel power on.
 735          */
 736         msleep(intel_dsi->panel_pwr_cycle_delay);
 737 }
 738
 739 static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
 740                                    enum pipe *pipe)
 741 {
 742         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 743         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 744         struct drm_device *dev = encoder->base.dev;
 745         enum intel_display_power_domain power_domain;
 746         enum port port;
 747         bool active = false;
 748
 749         DRM_DEBUG_KMS("\n");
 750
 751         power_domain = intel_display_port_power_domain(encoder);
 752         if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
 753                 return false;
 754
 755         /*
 756          * On Broxton the PLL needs to be enabled with a valid divider
 757          * configuration, otherwise accessing DSI registers will hang the
 758          * machine. See BSpec North Display Engine registers/MIPI[BXT].
 759          */
 760         if (IS_BROXTON(dev_priv) && !intel_dsi_pll_is_enabled(dev_priv))
 761                 goto out_put_power;
 762
 763         /* XXX: this only works for one DSI output */
 764         for_each_dsi_port(port, intel_dsi->ports) {
 765                 i915_reg_t ctrl_reg = IS_BROXTON(dev) ?
 766                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
 767                 bool enabled = I915_READ(ctrl_reg) & DPI_ENABLE;
 768
 769                 /*
 770                  * Due to some hardware limitations on VLV/CHV, the DPI enable
 771                  * bit in port C control register does not get set. As a
 772                  * workaround, check pipe B conf instead.
 773                  */
 774                 if ((IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) && port == PORT_C)
 775                         enabled = I915_READ(PIPECONF(PIPE_B)) & PIPECONF_ENABLE;
 776
 777                 /* Try command mode if video mode not enabled */
 778                 if (!enabled) {
 779                         u32 tmp = I915_READ(MIPI_DSI_FUNC_PRG(port));
 780                         enabled = tmp & CMD_MODE_DATA_WIDTH_MASK;
 781                 }
 782
 783                 if (!enabled)
 784                         continue;
 785
 786                 if (!(I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY))
 787                         continue;
 788
 789                 if (IS_BROXTON(dev_priv)) {
 790                         u32 tmp = I915_READ(MIPI_CTRL(port));
 791                         tmp &= BXT_PIPE_SELECT_MASK;
 792                         tmp >>= BXT_PIPE_SELECT_SHIFT;
 793
 794                         if (WARN_ON(tmp > PIPE_C))
 795                                 continue;
 796
 797                         *pipe = tmp;
 798                 } else {
 799                         *pipe = port == PORT_A ? PIPE_A : PIPE_B;
 800                 }
 801
 802                 active = true;
 803                 break;
 804         }
 805
 806 out_put_power:
 807         intel_display_power_put(dev_priv, power_domain);
 808
 809         return active;
 810 }
 811
 812 static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
 813                                  struct intel_crtc_state *pipe_config)
 814 {
 815         struct drm_device *dev = encoder->base.dev;
 816         struct drm_i915_private *dev_priv = to_i915(dev);
 817         struct drm_display_mode *adjusted_mode =
 818                                         &pipe_config->base.adjusted_mode;
 819         struct drm_display_mode *adjusted_mode_sw;
 820         struct intel_crtc *intel_crtc;
 821         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 822         unsigned int lane_count = intel_dsi->lane_count;
 823         unsigned int bpp, fmt;
 824         enum port port;
 825         u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
 826         u16 hfp_sw, hsync_sw, hbp_sw;
 827         u16 crtc_htotal_sw, crtc_hsync_start_sw, crtc_hsync_end_sw,
 828                                 crtc_hblank_start_sw, crtc_hblank_end_sw;
 829
 830         /* FIXME: hw readout should not depend on SW state */
 831         intel_crtc = to_intel_crtc(encoder->base.crtc);
 832         adjusted_mode_sw = &intel_crtc->config->base.adjusted_mode;
 833
 834         /*
 835          * Atleast one port is active as encoder->get_config called only if
 836          * encoder->get_hw_state() returns true.
 837          */
 838         for_each_dsi_port(port, intel_dsi->ports) {
 839                 if (I915_READ(BXT_MIPI_PORT_CTRL(port)) & DPI_ENABLE)
 840                         break;
 841         }
 842
 843         fmt = I915_READ(MIPI_DSI_FUNC_PRG(port)) & VID_MODE_FORMAT_MASK;
 844         pipe_config->pipe_bpp =
 845                         mipi_dsi_pixel_format_to_bpp(
 846                                 pixel_format_from_register_bits(fmt));
 847         bpp = pipe_config->pipe_bpp;
 848
 849         /* In terms of pixels */
 850         adjusted_mode->crtc_hdisplay =
 851                                 I915_READ(BXT_MIPI_TRANS_HACTIVE(port));
 852         adjusted_mode->crtc_vdisplay =
 853                                 I915_READ(BXT_MIPI_TRANS_VACTIVE(port));
 854         adjusted_mode->crtc_vtotal =
 855                                 I915_READ(BXT_MIPI_TRANS_VTOTAL(port));
 856
 857         hactive = adjusted_mode->crtc_hdisplay;
 858         hfp = I915_READ(MIPI_HFP_COUNT(port));
 859
 860         /*
 861          * Meaningful for video mode non-burst sync pulse mode only,
 862          * can be zero for non-burst sync events and burst modes
 863          */
 864         hsync = I915_READ(MIPI_HSYNC_PADDING_COUNT(port));
 865         hbp = I915_READ(MIPI_HBP_COUNT(port));
 866
 867         /* harizontal values are in terms of high speed byte clock */
 868         hfp = pixels_from_txbyteclkhs(hfp, bpp, lane_count,
 869                                                 intel_dsi->burst_mode_ratio);
 870         hsync = pixels_from_txbyteclkhs(hsync, bpp, lane_count,
 871                                                 intel_dsi->burst_mode_ratio);
 872         hbp = pixels_from_txbyteclkhs(hbp, bpp, lane_count,
 873                                                 intel_dsi->burst_mode_ratio);
 874
 875         if (intel_dsi->dual_link) {
 876                 hfp *= 2;
 877                 hsync *= 2;
 878                 hbp *= 2;
 879         }
 880
 881         /* vertical values are in terms of lines */
 882         vfp = I915_READ(MIPI_VFP_COUNT(port));
 883         vsync = I915_READ(MIPI_VSYNC_PADDING_COUNT(port));
 884         vbp = I915_READ(MIPI_VBP_COUNT(port));
 885
 886         adjusted_mode->crtc_htotal = hactive + hfp + hsync + hbp;
 887         adjusted_mode->crtc_hsync_start = hfp + adjusted_mode->crtc_hdisplay;
 888         adjusted_mode->crtc_hsync_end = hsync + adjusted_mode->crtc_hsync_start;
 889         adjusted_mode->crtc_hblank_start = adjusted_mode->crtc_hdisplay;
 890         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_htotal;
 891
 892         adjusted_mode->crtc_vsync_start = vfp + adjusted_mode->crtc_vdisplay;
 893         adjusted_mode->crtc_vsync_end = vsync + adjusted_mode->crtc_vsync_start;
 894         adjusted_mode->crtc_vblank_start = adjusted_mode->crtc_vdisplay;
 895         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vtotal;
 896
 897         /*
 898          * In BXT DSI there is no regs programmed with few horizontal timings
 899          * in Pixels but txbyteclkhs.. So retrieval process adds some
 900          * ROUND_UP ERRORS in the process of PIXELS<==>txbyteclkhs.
 901          * Actually here for the given adjusted_mode, we are calculating the
 902          * value programmed to the port and then back to the horizontal timing
 903          * param in pixels. This is the expected value, including roundup errors
 904          * And if that is same as retrieved value from port, then
 905          * (HW state) adjusted_mode's horizontal timings are corrected to
 906          * match with SW state to nullify the errors.
 907          */
 908         /* Calculating the value programmed to the Port register */
 909         hfp_sw = adjusted_mode_sw->crtc_hsync_start -
 910                                         adjusted_mode_sw->crtc_hdisplay;
 911         hsync_sw = adjusted_mode_sw->crtc_hsync_end -
 912                                         adjusted_mode_sw->crtc_hsync_start;
 913         hbp_sw = adjusted_mode_sw->crtc_htotal -
 914                                         adjusted_mode_sw->crtc_hsync_end;
 915
 916         if (intel_dsi->dual_link) {
 917                 hfp_sw /= 2;
 918                 hsync_sw /= 2;
 919                 hbp_sw /= 2;
 920         }
 921
 922         hfp_sw = txbyteclkhs(hfp_sw, bpp, lane_count,
 923                                                 intel_dsi->burst_mode_ratio);
 924         hsync_sw = txbyteclkhs(hsync_sw, bpp, lane_count,
 925                             intel_dsi->burst_mode_ratio);
 926         hbp_sw = txbyteclkhs(hbp_sw, bpp, lane_count,
 927                                                 intel_dsi->burst_mode_ratio);
 928
 929         /* Reverse calculating the adjusted mode parameters from port reg vals*/
 930         hfp_sw = pixels_from_txbyteclkhs(hfp_sw, bpp, lane_count,
 931                                                 intel_dsi->burst_mode_ratio);
 932         hsync_sw = pixels_from_txbyteclkhs(hsync_sw, bpp, lane_count,
 933                                                 intel_dsi->burst_mode_ratio);
 934         hbp_sw = pixels_from_txbyteclkhs(hbp_sw, bpp, lane_count,
 935                                                 intel_dsi->burst_mode_ratio);
 936
 937         if (intel_dsi->dual_link) {
 938                 hfp_sw *= 2;
 939                 hsync_sw *= 2;
 940                 hbp_sw *= 2;
 941         }
 942
 943         crtc_htotal_sw = adjusted_mode_sw->crtc_hdisplay + hfp_sw +
 944                                                         hsync_sw + hbp_sw;
 945         crtc_hsync_start_sw = hfp_sw + adjusted_mode_sw->crtc_hdisplay;
 946         crtc_hsync_end_sw = hsync_sw + crtc_hsync_start_sw;
 947         crtc_hblank_start_sw = adjusted_mode_sw->crtc_hdisplay;
 948         crtc_hblank_end_sw = crtc_htotal_sw;
 949
 950         if (adjusted_mode->crtc_htotal == crtc_htotal_sw)
 951                 adjusted_mode->crtc_htotal = adjusted_mode_sw->crtc_htotal;
 952
 953         if (adjusted_mode->crtc_hsync_start == crtc_hsync_start_sw)
 954                 adjusted_mode->crtc_hsync_start =
 955                                         adjusted_mode_sw->crtc_hsync_start;
 956
 957         if (adjusted_mode->crtc_hsync_end == crtc_hsync_end_sw)
 958                 adjusted_mode->crtc_hsync_end =
 959                                         adjusted_mode_sw->crtc_hsync_end;
 960
 961         if (adjusted_mode->crtc_hblank_start == crtc_hblank_start_sw)
 962                 adjusted_mode->crtc_hblank_start =
 963                                         adjusted_mode_sw->crtc_hblank_start;
 964
 965         if (adjusted_mode->crtc_hblank_end == crtc_hblank_end_sw)
 966                 adjusted_mode->crtc_hblank_end =
 967                                         adjusted_mode_sw->crtc_hblank_end;
 968 }
 969
 970 static void intel_dsi_get_config(struct intel_encoder *encoder,
 971                                  struct intel_crtc_state *pipe_config)
 972 {
 973         struct drm_device *dev = encoder->base.dev;
 974         u32 pclk;
 975         DRM_DEBUG_KMS("\n");
 976
 977         if (IS_BROXTON(dev))
 978                 bxt_dsi_get_pipe_config(encoder, pipe_config);
 979
 980         pclk = intel_dsi_get_pclk(encoder, pipe_config->pipe_bpp,
 981                                   pipe_config);
 982         if (!pclk)
 983                 return;
 984
 985         pipe_config->base.adjusted_mode.crtc_clock = pclk;
 986         pipe_config->port_clock = pclk;
 987 }
 988
 989 static enum drm_mode_status
 990 intel_dsi_mode_valid(struct drm_connector *connector,
 991                      struct drm_display_mode *mode)
 992 {
 993         struct intel_connector *intel_connector = to_intel_connector(connector);
 994         const struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 995         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 996
 997         DRM_DEBUG_KMS("\n");
 998
 999         if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
1000                 DRM_DEBUG_KMS("MODE_NO_DBLESCAN\n");
1001                 return MODE_NO_DBLESCAN;
1002         }
1003
1004         if (fixed_mode) {
1005                 if (mode->hdisplay > fixed_mode->hdisplay)
1006                         return MODE_PANEL;
1007                 if (mode->vdisplay > fixed_mode->vdisplay)
1008                         return MODE_PANEL;
1009                 if (fixed_mode->clock > max_dotclk)
1010                         return MODE_CLOCK_HIGH;
1011         }
1012
1013         return MODE_OK;
1014 }
1015
1016 /* return txclkesc cycles in terms of divider and duration in us */
1017 static u16 txclkesc(u32 divider, unsigned int us)
1018 {
1019         switch (divider) {
1020         case ESCAPE_CLOCK_DIVIDER_1:
1021         default:
1022                 return 20 * us;
1023         case ESCAPE_CLOCK_DIVIDER_2:
1024                 return 10 * us;
1025         case ESCAPE_CLOCK_DIVIDER_4:
1026                 return 5 * us;
1027         }
1028 }
1029
1030 static void set_dsi_timings(struct drm_encoder *encoder,
1031                             const struct drm_display_mode *adjusted_mode)
1032 {
1033         struct drm_device *dev = encoder->dev;
1034         struct drm_i915_private *dev_priv = to_i915(dev);
1035         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1036         enum port port;
1037         unsigned int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
1038         unsigned int lane_count = intel_dsi->lane_count;
1039
1040         u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
1041
1042         hactive = adjusted_mode->crtc_hdisplay;
1043         hfp = adjusted_mode->crtc_hsync_start - adjusted_mode->crtc_hdisplay;
1044         hsync = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
1045         hbp = adjusted_mode->crtc_htotal - adjusted_mode->crtc_hsync_end;
1046
1047         if (intel_dsi->dual_link) {
1048                 hactive /= 2;
1049                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
1050                         hactive += intel_dsi->pixel_overlap;
1051                 hfp /= 2;
1052                 hsync /= 2;
1053                 hbp /= 2;
1054         }
1055
1056         vfp = adjusted_mode->crtc_vsync_start - adjusted_mode->crtc_vdisplay;
1057         vsync = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
1058         vbp = adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vsync_end;
1059
1060         /* horizontal values are in terms of high speed byte clock */
1061         hactive = txbyteclkhs(hactive, bpp, lane_count,
1062                               intel_dsi->burst_mode_ratio);
1063         hfp = txbyteclkhs(hfp, bpp, lane_count, intel_dsi->burst_mode_ratio);
1064         hsync = txbyteclkhs(hsync, bpp, lane_count,
1065                             intel_dsi->burst_mode_ratio);
1066         hbp = txbyteclkhs(hbp, bpp, lane_count, intel_dsi->burst_mode_ratio);
1067
1068         for_each_dsi_port(port, intel_dsi->ports) {
1069                 if (IS_BROXTON(dev)) {
1070                         /*
1071                          * Program hdisplay and vdisplay on MIPI transcoder.
1072                          * This is different from calculated hactive and
1073                          * vactive, as they are calculated per channel basis,
1074                          * whereas these values should be based on resolution.
1075                          */
1076                         I915_WRITE(BXT_MIPI_TRANS_HACTIVE(port),
1077                                    adjusted_mode->crtc_hdisplay);
1078                         I915_WRITE(BXT_MIPI_TRANS_VACTIVE(port),
1079                                    adjusted_mode->crtc_vdisplay);
1080                         I915_WRITE(BXT_MIPI_TRANS_VTOTAL(port),
1081                                    adjusted_mode->crtc_vtotal);
1082                 }
1083
1084                 I915_WRITE(MIPI_HACTIVE_AREA_COUNT(port), hactive);
1085                 I915_WRITE(MIPI_HFP_COUNT(port), hfp);
1086
1087                 /* meaningful for video mode non-burst sync pulse mode only,
1088                  * can be zero for non-burst sync events and burst modes */
1089                 I915_WRITE(MIPI_HSYNC_PADDING_COUNT(port), hsync);
1090                 I915_WRITE(MIPI_HBP_COUNT(port), hbp);
1091
1092                 /* vertical values are in terms of lines */
1093                 I915_WRITE(MIPI_VFP_COUNT(port), vfp);
1094                 I915_WRITE(MIPI_VSYNC_PADDING_COUNT(port), vsync);
1095                 I915_WRITE(MIPI_VBP_COUNT(port), vbp);
1096         }
1097 }
1098
1099 static u32 pixel_format_to_reg(enum mipi_dsi_pixel_format fmt)
1100 {
1101         switch (fmt) {
1102         case MIPI_DSI_FMT_RGB888:
1103                 return VID_MODE_FORMAT_RGB888;
1104         case MIPI_DSI_FMT_RGB666:
1105                 return VID_MODE_FORMAT_RGB666;
1106         case MIPI_DSI_FMT_RGB666_PACKED:
1107                 return VID_MODE_FORMAT_RGB666_PACKED;
1108         case MIPI_DSI_FMT_RGB565:
1109                 return VID_MODE_FORMAT_RGB565;
1110         default:
1111                 MISSING_CASE(fmt);
1112                 return VID_MODE_FORMAT_RGB666;
1113         }
1114 }
1115
1116 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
1117                               struct intel_crtc_state *pipe_config)
1118 {
1119         struct drm_encoder *encoder = &intel_encoder->base;
1120         struct drm_device *dev = encoder->dev;
1121         struct drm_i915_private *dev_priv = to_i915(dev);
1122         struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc);
1123         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1124         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
1125         enum port port;
1126         unsigned int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
1127         u32 val, tmp;
1128         u16 mode_hdisplay;
1129
1130         DRM_DEBUG_KMS("pipe %c\n", pipe_name(intel_crtc->pipe));
1131
1132         mode_hdisplay = adjusted_mode->crtc_hdisplay;
1133
1134         if (intel_dsi->dual_link) {
1135                 mode_hdisplay /= 2;
1136                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
1137                         mode_hdisplay += intel_dsi->pixel_overlap;
1138         }
1139
1140         for_each_dsi_port(port, intel_dsi->ports) {
1141                 if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
1142                         /*
1143                          * escape clock divider, 20MHz, shared for A and C.
1144                          * device ready must be off when doing this! txclkesc?
1145                          */
1146                         tmp = I915_READ(MIPI_CTRL(PORT_A));
1147                         tmp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
1148                         I915_WRITE(MIPI_CTRL(PORT_A), tmp |
1149                                         ESCAPE_CLOCK_DIVIDER_1);
1150
1151                         /* read request priority is per pipe */
1152                         tmp = I915_READ(MIPI_CTRL(port));
1153                         tmp &= ~READ_REQUEST_PRIORITY_MASK;
1154                         I915_WRITE(MIPI_CTRL(port), tmp |
1155                                         READ_REQUEST_PRIORITY_HIGH);
1156                 } else if (IS_BROXTON(dev)) {
1157                         enum pipe pipe = intel_crtc->pipe;
1158
1159                         tmp = I915_READ(MIPI_CTRL(port));
1160                         tmp &= ~BXT_PIPE_SELECT_MASK;
1161
1162                         tmp |= BXT_PIPE_SELECT(pipe);
1163                         I915_WRITE(MIPI_CTRL(port), tmp);
1164                 }
1165
1166                 /* XXX: why here, why like this? handling in irq handler?! */
1167                 I915_WRITE(MIPI_INTR_STAT(port), 0xffffffff);
1168                 I915_WRITE(MIPI_INTR_EN(port), 0xffffffff);
1169
1170                 I915_WRITE(MIPI_DPHY_PARAM(port), intel_dsi->dphy_reg);
1171
1172                 I915_WRITE(MIPI_DPI_RESOLUTION(port),
1173                         adjusted_mode->crtc_vdisplay << VERTICAL_ADDRESS_SHIFT |
1174                         mode_hdisplay << HORIZONTAL_ADDRESS_SHIFT);
1175         }
1176
1177         set_dsi_timings(encoder, adjusted_mode);
1178
1179         val = intel_dsi->lane_count << DATA_LANES_PRG_REG_SHIFT;
1180         if (is_cmd_mode(intel_dsi)) {
1181                 val |= intel_dsi->channel << CMD_MODE_CHANNEL_NUMBER_SHIFT;
1182                 val |= CMD_MODE_DATA_WIDTH_8_BIT; /* XXX */
1183         } else {
1184                 val |= intel_dsi->channel << VID_MODE_CHANNEL_NUMBER_SHIFT;
1185                 val |= pixel_format_to_reg(intel_dsi->pixel_format);
1186         }
1187
1188         tmp = 0;
1189         if (intel_dsi->eotp_pkt == 0)
1190                 tmp |= EOT_DISABLE;
1191         if (intel_dsi->clock_stop)
1192                 tmp |= CLOCKSTOP;
1193
1194         if (IS_BROXTON(dev_priv)) {
1195                 tmp |= BXT_DPHY_DEFEATURE_EN;
1196                 if (!is_cmd_mode(intel_dsi))
1197                         tmp |= BXT_DEFEATURE_DPI_FIFO_CTR;
1198         }
1199
1200         for_each_dsi_port(port, intel_dsi->ports) {
1201                 I915_WRITE(MIPI_DSI_FUNC_PRG(port), val);
1202
1203                 /* timeouts for recovery. one frame IIUC. if counter expires,
1204                  * EOT and stop state. */
1205
1206                 /*
1207                  * In burst mode, value greater than one DPI line Time in byte
1208                  * clock (txbyteclkhs) To timeout this timer 1+ of the above
1209                  * said value is recommended.
1210                  *
1211                  * In non-burst mode, Value greater than one DPI frame time in
1212                  * byte clock(txbyteclkhs) To timeout this timer 1+ of the above
1213                  * said value is recommended.
1214                  *
1215                  * In DBI only mode, value greater than one DBI frame time in
1216                  * byte clock(txbyteclkhs) To timeout this timer 1+ of the above
1217                  * said value is recommended.
1218                  */
1219
1220                 if (is_vid_mode(intel_dsi) &&
1221                         intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
1222                         I915_WRITE(MIPI_HS_TX_TIMEOUT(port),
1223                                 txbyteclkhs(adjusted_mode->crtc_htotal, bpp,
1224                                             intel_dsi->lane_count,
1225                                             intel_dsi->burst_mode_ratio) + 1);
1226                 } else {
1227                         I915_WRITE(MIPI_HS_TX_TIMEOUT(port),
1228                                 txbyteclkhs(adjusted_mode->crtc_vtotal *
1229                                             adjusted_mode->crtc_htotal,
1230                                             bpp, intel_dsi->lane_count,
1231                                             intel_dsi->burst_mode_ratio) + 1);
1232                 }
1233                 I915_WRITE(MIPI_LP_RX_TIMEOUT(port), intel_dsi->lp_rx_timeout);
1234                 I915_WRITE(MIPI_TURN_AROUND_TIMEOUT(port),
1235                                                 intel_dsi->turn_arnd_val);
1236                 I915_WRITE(MIPI_DEVICE_RESET_TIMER(port),
1237                                                 intel_dsi->rst_timer_val);
1238
1239                 /* dphy stuff */
1240
1241                 /* in terms of low power clock */
1242                 I915_WRITE(MIPI_INIT_COUNT(port),
1243                                 txclkesc(intel_dsi->escape_clk_div, 100));
1244
1245                 if (IS_BROXTON(dev) && (!intel_dsi->dual_link)) {
1246                         /*
1247                          * BXT spec says write MIPI_INIT_COUNT for
1248                          * both the ports, even if only one is
1249                          * getting used. So write the other port
1250                          * if not in dual link mode.
1251                          */
1252                         I915_WRITE(MIPI_INIT_COUNT(port ==
1253                                                 PORT_A ? PORT_C : PORT_A),
1254                                         intel_dsi->init_count);
1255                 }
1256
1257                 /* recovery disables */
1258                 I915_WRITE(MIPI_EOT_DISABLE(port), tmp);
1259
1260                 /* in terms of low power clock */
1261                 I915_WRITE(MIPI_INIT_COUNT(port), intel_dsi->init_count);
1262
1263                 /* in terms of txbyteclkhs. actual high to low switch +
1264                  * MIPI_STOP_STATE_STALL * MIPI_LP_BYTECLK.
1265                  *
1266                  * XXX: write MIPI_STOP_STATE_STALL?
1267                  */
1268                 I915_WRITE(MIPI_HIGH_LOW_SWITCH_COUNT(port),
1269                                                 intel_dsi->hs_to_lp_count);
1270
1271                 /* XXX: low power clock equivalence in terms of byte clock.
1272                  * the number of byte clocks occupied in one low power clock.
1273                  * based on txbyteclkhs and txclkesc.
1274                  * txclkesc time / txbyteclk time * (105 + MIPI_STOP_STATE_STALL
1275                  * ) / 105.???
1276                  */
1277                 I915_WRITE(MIPI_LP_BYTECLK(port), intel_dsi->lp_byte_clk);
1278
1279                 /* the bw essential for transmitting 16 long packets containing
1280                  * 252 bytes meant for dcs write memory command is programmed in
1281                  * this register in terms of byte clocks. based on dsi transfer
1282                  * rate and the number of lanes configured the time taken to
1283                  * transmit 16 long packets in a dsi stream varies. */
1284                 I915_WRITE(MIPI_DBI_BW_CTRL(port), intel_dsi->bw_timer);
1285
1286                 I915_WRITE(MIPI_CLK_LANE_SWITCH_TIME_CNT(port),
1287                 intel_dsi->clk_lp_to_hs_count << LP_HS_SSW_CNT_SHIFT |
1288                 intel_dsi->clk_hs_to_lp_count << HS_LP_PWR_SW_CNT_SHIFT);
1289
1290                 if (is_vid_mode(intel_dsi))
1291                         /* Some panels might have resolution which is not a
1292                          * multiple of 64 like 1366 x 768. Enable RANDOM
1293                          * resolution support for such panels by default */
1294                         I915_WRITE(MIPI_VIDEO_MODE_FORMAT(port),
1295                                 intel_dsi->video_frmt_cfg_bits |
1296                                 intel_dsi->video_mode_format |
1297                                 IP_TG_CONFIG |
1298                                 RANDOM_DPI_DISPLAY_RESOLUTION);
1299         }
1300 }
1301
1302 static enum drm_connector_status
1303 intel_dsi_detect(struct drm_connector *connector, bool force)
1304 {
1305         return connector_status_connected;
1306 }
1307
1308 static int intel_dsi_get_modes(struct drm_connector *connector)
1309 {
1310         struct intel_connector *intel_connector = to_intel_connector(connector);
1311         struct drm_display_mode *mode;
1312
1313         DRM_DEBUG_KMS("\n");
1314
1315         if (!intel_connector->panel.fixed_mode) {
1316                 DRM_DEBUG_KMS("no fixed mode\n");
1317                 return 0;
1318         }
1319
1320         mode = drm_mode_duplicate(connector->dev,
1321                                   intel_connector->panel.fixed_mode);
1322         if (!mode) {
1323                 DRM_DEBUG_KMS("drm_mode_duplicate failed\n");
1324                 return 0;
1325         }
1326
1327         drm_mode_probed_add(connector, mode);
1328         return 1;
1329 }
1330
1331 static int intel_dsi_set_property(struct drm_connector *connector,
1332                                   struct drm_property *property,
1333                                   uint64_t val)
1334 {
1335         struct drm_device *dev = connector->dev;
1336         struct intel_connector *intel_connector = to_intel_connector(connector);
1337         struct drm_crtc *crtc;
1338         int ret;
1339
1340         ret = drm_object_property_set_value(&connector->base, property, val);
1341         if (ret)
1342                 return ret;
1343
1344         if (property == dev->mode_config.scaling_mode_property) {
1345                 if (val == DRM_MODE_SCALE_NONE) {
1346                         DRM_DEBUG_KMS("no scaling not supported\n");
1347                         return -EINVAL;
1348                 }
1349                 if (HAS_GMCH_DISPLAY(dev) &&
1350                     val == DRM_MODE_SCALE_CENTER) {
1351                         DRM_DEBUG_KMS("centering not supported\n");
1352                         return -EINVAL;
1353                 }
1354
1355                 if (intel_connector->panel.fitting_mode == val)
1356                         return 0;
1357
1358                 intel_connector->panel.fitting_mode = val;
1359         }
1360
1361         crtc = connector->state->crtc;
1362         if (crtc && crtc->state->enable) {
1363                 /*
1364                  * If the CRTC is enabled, the display will be changed
1365                  * according to the new panel fitting mode.
1366                  */
1367                 intel_crtc_restore_mode(crtc);
1368         }
1369
1370         return 0;
1371 }
1372
1373 static void intel_dsi_connector_destroy(struct drm_connector *connector)
1374 {
1375         struct intel_connector *intel_connector = to_intel_connector(connector);
1376
1377         DRM_DEBUG_KMS("\n");
1378         intel_panel_fini(&intel_connector->panel);
1379         drm_connector_cleanup(connector);
1380         kfree(connector);
1381 }
1382
1383 static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)
1384 {
1385         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1386
1387         if (intel_dsi->panel) {
1388                 drm_panel_detach(intel_dsi->panel);
1389                 /* XXX: Logically this call belongs in the panel driver. */
1390                 drm_panel_remove(intel_dsi->panel);
1391         }
1392
1393         /* dispose of the gpios */
1394         if (intel_dsi->gpio_panel)
1395                 gpiod_put(intel_dsi->gpio_panel);
1396
1397         intel_encoder_destroy(encoder);
1398 }
1399
1400 static const struct drm_encoder_funcs intel_dsi_funcs = {
1401         .destroy = intel_dsi_encoder_destroy,
1402 };
1403
1404 static const struct drm_connector_helper_funcs intel_dsi_connector_helper_funcs = {
1405         .get_modes = intel_dsi_get_modes,
1406         .mode_valid = intel_dsi_mode_valid,
1407 };
1408
1409 static const struct drm_connector_funcs intel_dsi_connector_funcs = {
1410         .dpms = drm_atomic_helper_connector_dpms,
1411         .detect = intel_dsi_detect,
1412         .late_register = intel_connector_register,
1413         .early_unregister = intel_connector_unregister,
1414         .destroy = intel_dsi_connector_destroy,
1415         .fill_modes = drm_helper_probe_single_connector_modes,
1416         .set_property = intel_dsi_set_property,
1417         .atomic_get_property = intel_connector_atomic_get_property,
1418         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1419         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1420 };
1421
1422 static void intel_dsi_add_properties(struct intel_connector *connector)
1423 {
1424         struct drm_device *dev = connector->base.dev;
1425
1426         if (connector->panel.fixed_mode) {
1427                 drm_mode_create_scaling_mode_property(dev);
1428                 drm_object_attach_property(&connector->base.base,
1429                                            dev->mode_config.scaling_mode_property,
1430                                            DRM_MODE_SCALE_ASPECT);
1431                 connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
1432         }
1433 }
1434
1435 void intel_dsi_init(struct drm_device *dev)
1436 {
1437         struct intel_dsi *intel_dsi;
1438         struct intel_encoder *intel_encoder;
1439         struct drm_encoder *encoder;
1440         struct intel_connector *intel_connector;
1441         struct drm_connector *connector;
1442         struct drm_display_mode *scan, *fixed_mode = NULL;
1443         struct drm_i915_private *dev_priv = to_i915(dev);
1444         enum port port;
1445         unsigned int i;
1446
1447         DRM_DEBUG_KMS("\n");
1448
1449         /* There is no detection method for MIPI so rely on VBT */
1450         if (!intel_bios_is_dsi_present(dev_priv, &port))
1451                 return;
1452
1453         if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
1454                 dev_priv->mipi_mmio_base = VLV_MIPI_BASE;
1455         } else if (IS_BROXTON(dev)) {
1456                 dev_priv->mipi_mmio_base = BXT_MIPI_BASE;
1457         } else {
1458                 DRM_ERROR("Unsupported Mipi device to reg base");
1459                 return;
1460         }
1461
1462         intel_dsi = kzalloc(sizeof(*intel_dsi), GFP_KERNEL);
1463         if (!intel_dsi)
1464                 return;
1465
1466         intel_connector = intel_connector_alloc();
1467         if (!intel_connector) {
1468                 kfree(intel_dsi);
1469                 return;
1470         }
1471
1472         intel_encoder = &intel_dsi->base;
1473         encoder = &intel_encoder->base;
1474         intel_dsi->attached_connector = intel_connector;
1475
1476         connector = &intel_connector->base;
1477
1478         drm_encoder_init(dev, encoder, &intel_dsi_funcs, DRM_MODE_ENCODER_DSI,
1479                          "DSI %c", port_name(port));
1480
1481         intel_encoder->compute_config = intel_dsi_compute_config;
1482         intel_encoder->pre_enable = intel_dsi_pre_enable;
1483         intel_encoder->enable = intel_dsi_enable_nop;
1484         intel_encoder->disable = intel_dsi_pre_disable;
1485         intel_encoder->post_disable = intel_dsi_post_disable;
1486         intel_encoder->get_hw_state = intel_dsi_get_hw_state;
1487         intel_encoder->get_config = intel_dsi_get_config;
1488
1489         intel_connector->get_hw_state = intel_connector_get_hw_state;
1490
1491         /*
1492          * On BYT/CHV, pipe A maps to MIPI DSI port A, pipe B maps to MIPI DSI
1493          * port C. BXT isn't limited like this.
1494          */
1495         if (IS_BROXTON(dev_priv))
1496                 intel_encoder->crtc_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C);
1497         else if (port == PORT_A)
1498                 intel_encoder->crtc_mask = BIT(PIPE_A);
1499         else
1500                 intel_encoder->crtc_mask = BIT(PIPE_B);
1501
1502         if (dev_priv->vbt.dsi.config->dual_link) {
1503                 intel_dsi->ports = BIT(PORT_A) | BIT(PORT_C);
1504
1505                 switch (dev_priv->vbt.dsi.config->dl_dcs_backlight_ports) {
1506                 case DL_DCS_PORT_A:
1507                         intel_dsi->dcs_backlight_ports = BIT(PORT_A);
1508                         break;
1509                 case DL_DCS_PORT_C:
1510                         intel_dsi->dcs_backlight_ports = BIT(PORT_C);
1511                         break;
1512                 default:
1513                 case DL_DCS_PORT_A_AND_C:
1514                         intel_dsi->dcs_backlight_ports = BIT(PORT_A) | BIT(PORT_C);
1515                         break;
1516                 }
1517
1518                 switch (dev_priv->vbt.dsi.config->dl_dcs_cabc_ports) {
1519                 case DL_DCS_PORT_A:
1520                         intel_dsi->dcs_cabc_ports = BIT(PORT_A);
1521                         break;
1522                 case DL_DCS_PORT_C:
1523                         intel_dsi->dcs_cabc_ports = BIT(PORT_C);
1524                         break;
1525                 default:
1526                 case DL_DCS_PORT_A_AND_C:
1527                         intel_dsi->dcs_cabc_ports = BIT(PORT_A) | BIT(PORT_C);
1528                         break;
1529                 }
1530         } else {
1531                 intel_dsi->ports = BIT(port);
1532                 intel_dsi->dcs_backlight_ports = BIT(port);
1533                 intel_dsi->dcs_cabc_ports = BIT(port);
1534         }
1535
1536         if (!dev_priv->vbt.dsi.config->cabc_supported)
1537                 intel_dsi->dcs_cabc_ports = 0;
1538
1539         /* Create a DSI host (and a device) for each port. */
1540         for_each_dsi_port(port, intel_dsi->ports) {
1541                 struct intel_dsi_host *host;
1542
1543                 host = intel_dsi_host_init(intel_dsi, port);
1544                 if (!host)
1545                         goto err;
1546
1547                 intel_dsi->dsi_hosts[port] = host;
1548         }
1549
1550         for (i = 0; i < ARRAY_SIZE(intel_dsi_drivers); i++) {
1551                 intel_dsi->panel = intel_dsi_drivers[i].init(intel_dsi,
1552                                                              intel_dsi_drivers[i].panel_id);
1553                 if (intel_dsi->panel)
1554                         break;
1555         }
1556
1557         if (!intel_dsi->panel) {
1558                 DRM_DEBUG_KMS("no device found\n");
1559                 goto err;
1560         }
1561
1562         /*
1563          * In case of BYT with CRC PMIC, we need to use GPIO for
1564          * Panel control.
1565          */
1566         if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1567                 intel_dsi->gpio_panel =
1568                         gpiod_get(dev->dev, "panel", GPIOD_OUT_HIGH);
1569
1570                 if (IS_ERR(intel_dsi->gpio_panel)) {
1571                         DRM_ERROR("Failed to own gpio for panel control\n");
1572                         intel_dsi->gpio_panel = NULL;
1573                 }
1574         }
1575
1576         intel_encoder->type = INTEL_OUTPUT_DSI;
1577         intel_encoder->cloneable = 0;
1578         drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
1579                            DRM_MODE_CONNECTOR_DSI);
1580
1581         drm_connector_helper_add(connector, &intel_dsi_connector_helper_funcs);
1582
1583         connector->display_info.subpixel_order = SubPixelHorizontalRGB; /*XXX*/
1584         connector->interlace_allowed = false;
1585         connector->doublescan_allowed = false;
1586
1587         intel_connector_attach_encoder(intel_connector, intel_encoder);
1588
1589         drm_panel_attach(intel_dsi->panel, connector);
1590
1591         mutex_lock(&dev->mode_config.mutex);
1592         drm_panel_get_modes(intel_dsi->panel);
1593         list_for_each_entry(scan, &connector->probed_modes, head) {
1594                 if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
1595                         fixed_mode = drm_mode_duplicate(dev, scan);
1596                         break;
1597                 }
1598         }
1599         mutex_unlock(&dev->mode_config.mutex);
1600
1601         if (!fixed_mode) {
1602                 DRM_DEBUG_KMS("no fixed mode\n");
1603                 goto err;
1604         }
1605
1606         connector->display_info.width_mm = fixed_mode->width_mm;
1607         connector->display_info.height_mm = fixed_mode->height_mm;
1608
1609         intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
1610         intel_panel_setup_backlight(connector, INVALID_PIPE);
1611
1612         intel_dsi_add_properties(intel_connector);
1613
1614         return;
1615
1616 err:
1617         drm_encoder_cleanup(&intel_encoder->base);
1618         kfree(intel_dsi);
1619         kfree(intel_connector);
1620 }