drivers/gpu/drm/msm/dp/dp_panel.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include "dp_panel.h"
   7
   8 #include <drm/drm_connector.h>
   9 #include <drm/drm_edid.h>
  10 #include <drm/drm_print.h>
  11
  12 struct dp_panel_private {
  13         struct device *dev;
  14         struct dp_panel dp_panel;
  15         struct drm_dp_aux *aux;
  16         struct dp_link *link;
  17         struct dp_catalog *catalog;
  18         bool panel_on;
  19         bool aux_cfg_update_done;
  20 };
  21
  22 static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
  23 {
  24         int rc = 0;
  25         size_t len;
  26         ssize_t rlen;
  27         struct dp_panel_private *panel;
  28         struct dp_link_info *link_info;
  29         u8 *dpcd, major = 0, minor = 0, temp;
  30         u32 offset = DP_DPCD_REV;
  31
  32         dpcd = dp_panel->dpcd;
  33
  34         panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
  35         link_info = &dp_panel->link_info;
  36
  37         rlen = drm_dp_dpcd_read(panel->aux, offset,
  38                         dpcd, (DP_RECEIVER_CAP_SIZE + 1));
  39         if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) {
  40                 DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen);
  41                 if (rlen == -ETIMEDOUT)
  42                         rc = rlen;
  43                 else
  44                         rc = -EINVAL;
  45
  46                 goto end;
  47         }
  48
  49         temp = dpcd[DP_TRAINING_AUX_RD_INTERVAL];
  50
  51         /* check for EXTENDED_RECEIVER_CAPABILITY_FIELD_PRESENT */
  52         if (temp & BIT(7)) {
  53                 DRM_DEBUG_DP("using EXTENDED_RECEIVER_CAPABILITY_FIELD\n");
  54                 offset = DPRX_EXTENDED_DPCD_FIELD;
  55         }
  56
  57         rlen = drm_dp_dpcd_read(panel->aux, offset,
  58                 dpcd, (DP_RECEIVER_CAP_SIZE + 1));
  59         if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) {
  60                 DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen);
  61                 if (rlen == -ETIMEDOUT)
  62                         rc = rlen;
  63                 else
  64                         rc = -EINVAL;
  65
  66                 goto end;
  67         }
  68
  69         link_info->revision = dpcd[DP_DPCD_REV];
  70         major = (link_info->revision >> 4) & 0x0f;
  71         minor = link_info->revision & 0x0f;
  72
  73         link_info->rate = drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
  74         link_info->num_lanes = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
  75
  76         if (link_info->num_lanes > dp_panel->max_dp_lanes)
  77                 link_info->num_lanes = dp_panel->max_dp_lanes;
  78
  79         /* Limit support upto HBR2 until HBR3 support is added */
  80         if (link_info->rate >= (drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4)))
  81                 link_info->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4);
  82
  83         DRM_DEBUG_DP("version: %d.%d\n", major, minor);
  84         DRM_DEBUG_DP("link_rate=%d\n", link_info->rate);
  85         DRM_DEBUG_DP("lane_count=%d\n", link_info->num_lanes);
  86
  87         if (drm_dp_enhanced_frame_cap(dpcd))
  88                 link_info->capabilities |= DP_LINK_CAP_ENHANCED_FRAMING;
  89
  90         dp_panel->dfp_present = dpcd[DP_DOWNSTREAMPORT_PRESENT];
  91         dp_panel->dfp_present &= DP_DWN_STRM_PORT_PRESENT;
  92
  93         if (dp_panel->dfp_present && (dpcd[DP_DPCD_REV] > 0x10)) {
  94                 dp_panel->ds_port_cnt = dpcd[DP_DOWN_STREAM_PORT_COUNT];
  95                 dp_panel->ds_port_cnt &= DP_PORT_COUNT_MASK;
  96                 len = DP_DOWNSTREAM_PORTS * DP_DOWNSTREAM_CAP_SIZE;
  97
  98                 rlen = drm_dp_dpcd_read(panel->aux,
  99                         DP_DOWNSTREAM_PORT_0, dp_panel->ds_cap_info, len);
 100                 if (rlen < len) {
 101                         DRM_ERROR("ds port status failed, rlen=%zd\n", rlen);
 102                         rc = -EINVAL;
 103                         goto end;
 104                 }
 105         }
 106
 107 end:
 108         return rc;
 109 }
 110
 111 static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel,
 112                 u32 mode_edid_bpp, u32 mode_pclk_khz)
 113 {
 114         struct dp_link_info *link_info;
 115         const u32 max_supported_bpp = 30, min_supported_bpp = 18;
 116         u32 bpp = 0, data_rate_khz = 0;
 117
 118         bpp = min_t(u32, mode_edid_bpp, max_supported_bpp);
 119
 120         link_info = &dp_panel->link_info;
 121         data_rate_khz = link_info->num_lanes * link_info->rate * 8;
 122
 123         while (bpp > min_supported_bpp) {
 124                 if (mode_pclk_khz * bpp <= data_rate_khz)
 125                         break;
 126                 bpp -= 6;
 127         }
 128
 129         return bpp;
 130 }
 131
 132 static int dp_panel_update_modes(struct drm_connector *connector,
 133         struct edid *edid)
 134 {
 135         int rc = 0;
 136
 137         if (edid) {
 138                 rc = drm_connector_update_edid_property(connector, edid);
 139                 if (rc) {
 140                         DRM_ERROR("failed to update edid property %d\n", rc);
 141                         return rc;
 142                 }
 143                 rc = drm_add_edid_modes(connector, edid);
 144                 return rc;
 145         }
 146
 147         rc = drm_connector_update_edid_property(connector, NULL);
 148         if (rc)
 149                 DRM_ERROR("failed to update edid property %d\n", rc);
 150
 151         return rc;
 152 }
 153
 154 int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
 155         struct drm_connector *connector)
 156 {
 157         int rc = 0, bw_code;
 158         int rlen, count;
 159         struct dp_panel_private *panel;
 160
 161         if (!dp_panel || !connector) {
 162                 DRM_ERROR("invalid input\n");
 163                 return -EINVAL;
 164         }
 165
 166         panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
 167
 168         rc = dp_panel_read_dpcd(dp_panel);
 169         if (rc) {
 170                 DRM_ERROR("read dpcd failed %d\n", rc);
 171                 return rc;
 172         }
 173
 174         bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
 175         if (!is_link_rate_valid(bw_code) ||
 176                         !is_lane_count_valid(dp_panel->link_info.num_lanes) ||
 177                         (bw_code > dp_panel->max_bw_code)) {
 178                 DRM_ERROR("Illegal link rate=%d lane=%d\n", dp_panel->link_info.rate,
 179                                 dp_panel->link_info.num_lanes);
 180                 return -EINVAL;
 181         }
 182
 183         if (dp_panel->dfp_present) {
 184                 rlen = drm_dp_dpcd_read(panel->aux, DP_SINK_COUNT,
 185                                 &count, 1);
 186                 if (rlen == 1) {
 187                         count = DP_GET_SINK_COUNT(count);
 188                         if (!count) {
 189                                 DRM_ERROR("no downstream ports connected\n");
 190                                 panel->link->sink_count = 0;
 191                                 rc = -ENOTCONN;
 192                                 goto end;
 193                         }
 194                 }
 195         }
 196
 197         kfree(dp_panel->edid);
 198         dp_panel->edid = NULL;
 199
 200         dp_panel->edid = drm_get_edid(connector,
 201                                               &panel->aux->ddc);
 202         if (!dp_panel->edid) {
 203                 DRM_ERROR("panel edid read failed\n");
 204                 /* check edid read fail is due to unplug */
 205                 if (!dp_catalog_link_is_connected(panel->catalog)) {
 206                         rc = -ETIMEDOUT;
 207                         goto end;
 208                 }
 209
 210                 /* fail safe edid */
 211                 mutex_lock(&connector->dev->mode_config.mutex);
 212                 if (drm_add_modes_noedid(connector, 640, 480))
 213                         drm_set_preferred_mode(connector, 640, 480);
 214                 mutex_unlock(&connector->dev->mode_config.mutex);
 215         }
 216
 217         if (panel->aux_cfg_update_done) {
 218                 DRM_DEBUG_DP("read DPCD with updated AUX config\n");
 219                 rc = dp_panel_read_dpcd(dp_panel);
 220                 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
 221                 if (rc || !is_link_rate_valid(bw_code) ||
 222                         !is_lane_count_valid(dp_panel->link_info.num_lanes)
 223                         || (bw_code > dp_panel->max_bw_code)) {
 224                         DRM_ERROR("read dpcd failed %d\n", rc);
 225                         return rc;
 226                 }
 227                 panel->aux_cfg_update_done = false;
 228         }
 229 end:
 230         return rc;
 231 }
 232
 233 u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel,
 234                 u32 mode_edid_bpp, u32 mode_pclk_khz)
 235 {
 236         struct dp_panel_private *panel;
 237         u32 bpp = mode_edid_bpp;
 238
 239         if (!dp_panel || !mode_edid_bpp || !mode_pclk_khz) {
 240                 DRM_ERROR("invalid input\n");
 241                 return 0;
 242         }
 243
 244         panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
 245
 246         if (dp_panel->video_test)
 247                 bpp = dp_link_bit_depth_to_bpp(
 248                                 panel->link->test_video.test_bit_depth);
 249         else
 250                 bpp = dp_panel_get_supported_bpp(dp_panel, mode_edid_bpp,
 251                                 mode_pclk_khz);
 252
 253         return bpp;
 254 }
 255
 256 int dp_panel_get_modes(struct dp_panel *dp_panel,
 257         struct drm_connector *connector, struct dp_display_mode *mode)
 258 {
 259         if (!dp_panel) {
 260                 DRM_ERROR("invalid input\n");
 261                 return -EINVAL;
 262         }
 263
 264         if (dp_panel->edid)
 265                 return dp_panel_update_modes(connector, dp_panel->edid);
 266
 267         return 0;
 268 }
 269
 270 static u8 dp_panel_get_edid_checksum(struct edid *edid)
 271 {
 272         struct edid *last_block;
 273         u8 *raw_edid;
 274         bool is_edid_corrupt = false;
 275
 276         if (!edid) {
 277                 DRM_ERROR("invalid edid input\n");
 278                 return 0;
 279         }
 280
 281         raw_edid = (u8 *)edid;
 282         raw_edid += (edid->extensions * EDID_LENGTH);
 283         last_block = (struct edid *)raw_edid;
 284
 285         /* block type extension */
 286         drm_edid_block_valid(raw_edid, 1, false, &is_edid_corrupt);
 287         if (!is_edid_corrupt)
 288                 return last_block->checksum;
 289
 290         DRM_ERROR("Invalid block, no checksum\n");
 291         return 0;
 292 }
 293
 294 void dp_panel_handle_sink_request(struct dp_panel *dp_panel)
 295 {
 296         struct dp_panel_private *panel;
 297
 298         if (!dp_panel) {
 299                 DRM_ERROR("invalid input\n");
 300                 return;
 301         }
 302
 303         panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
 304
 305         if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
 306                 u8 checksum;
 307
 308                 if (dp_panel->edid)
 309                         checksum = dp_panel_get_edid_checksum(dp_panel->edid);
 310                 else
 311                         checksum = dp_panel->connector->real_edid_checksum;
 312
 313                 dp_link_send_edid_checksum(panel->link, checksum);
 314                 dp_link_send_test_response(panel->link);
 315         }
 316 }
 317
 318 void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable)
 319 {
 320         struct dp_catalog *catalog;
 321         struct dp_panel_private *panel;
 322
 323         if (!dp_panel) {
 324                 DRM_ERROR("invalid input\n");
 325                 return;
 326         }
 327
 328         panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
 329         catalog = panel->catalog;
 330
 331         if (!panel->panel_on) {
 332                 DRM_DEBUG_DP("DP panel not enabled, handle TPG on next on\n");
 333                 return;
 334         }
 335
 336         if (!enable) {
 337                 dp_catalog_panel_tpg_disable(catalog);
 338                 return;
 339         }
 340
 341         DRM_DEBUG_DP("%s: calling catalog tpg_enable\n", __func__);
 342         dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode);
 343 }
 344
 345 void dp_panel_dump_regs(struct dp_panel *dp_panel)
 346 {
 347         struct dp_catalog *catalog;
 348         struct dp_panel_private *panel;
 349
 350         panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
 351         catalog = panel->catalog;
 352
 353         dp_catalog_dump_regs(catalog);
 354 }
 355
 356 int dp_panel_timing_cfg(struct dp_panel *dp_panel)
 357 {
 358         u32 data, total_ver, total_hor;
 359         struct dp_catalog *catalog;
 360         struct dp_panel_private *panel;
 361         struct drm_display_mode *drm_mode;
 362
 363         panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
 364         catalog = panel->catalog;
 365         drm_mode = &panel->dp_panel.dp_mode.drm_mode;
 366
 367         DRM_DEBUG_DP("width=%d hporch= %d %d %d\n",
 368                 drm_mode->hdisplay, drm_mode->htotal - drm_mode->hsync_end,
 369                 drm_mode->hsync_start - drm_mode->hdisplay,
 370                 drm_mode->hsync_end - drm_mode->hsync_start);
 371
 372         DRM_DEBUG_DP("height=%d vporch= %d %d %d\n",
 373                 drm_mode->vdisplay, drm_mode->vtotal - drm_mode->vsync_end,
 374                 drm_mode->vsync_start - drm_mode->vdisplay,
 375                 drm_mode->vsync_end - drm_mode->vsync_start);
 376
 377         total_hor = drm_mode->htotal;
 378
 379         total_ver = drm_mode->vtotal;
 380
 381         data = total_ver;
 382         data <<= 16;
 383         data |= total_hor;
 384
 385         catalog->total = data;
 386
 387         data = (drm_mode->vtotal - drm_mode->vsync_start);
 388         data <<= 16;
 389         data |= (drm_mode->htotal - drm_mode->hsync_start);
 390
 391         catalog->sync_start = data;
 392
 393         data = drm_mode->vsync_end - drm_mode->vsync_start;
 394         data <<= 16;
 395         data |= (panel->dp_panel.dp_mode.v_active_low << 31);
 396         data |= drm_mode->hsync_end - drm_mode->hsync_start;
 397         data |= (panel->dp_panel.dp_mode.h_active_low << 15);
 398
 399         catalog->width_blanking = data;
 400
 401         data = drm_mode->vdisplay;
 402         data <<= 16;
 403         data |= drm_mode->hdisplay;
 404
 405         catalog->dp_active = data;
 406
 407         dp_catalog_panel_timing_cfg(catalog);
 408         panel->panel_on = true;
 409
 410         return 0;
 411 }
 412
 413 int dp_panel_init_panel_info(struct dp_panel *dp_panel)
 414 {
 415         struct drm_display_mode *drm_mode;
 416
 417         drm_mode = &dp_panel->dp_mode.drm_mode;
 418
 419         /*
 420          * print resolution info as this is a result
 421          * of user initiated action of cable connection
 422          */
 423         DRM_DEBUG_DP("SET NEW RESOLUTION:\n");
 424         DRM_DEBUG_DP("%dx%d@%dfps\n", drm_mode->hdisplay,
 425                 drm_mode->vdisplay, drm_mode_vrefresh(drm_mode));
 426         DRM_DEBUG_DP("h_porches(back|front|width) = (%d|%d|%d)\n",
 427                         drm_mode->htotal - drm_mode->hsync_end,
 428                         drm_mode->hsync_start - drm_mode->hdisplay,
 429                         drm_mode->hsync_end - drm_mode->hsync_start);
 430         DRM_DEBUG_DP("v_porches(back|front|width) = (%d|%d|%d)\n",
 431                         drm_mode->vtotal - drm_mode->vsync_end,
 432                         drm_mode->vsync_start - drm_mode->vdisplay,
 433                         drm_mode->vsync_end - drm_mode->vsync_start);
 434         DRM_DEBUG_DP("pixel clock (KHz)=(%d)\n", drm_mode->clock);
 435         DRM_DEBUG_DP("bpp = %d\n", dp_panel->dp_mode.bpp);
 436
 437         dp_panel->dp_mode.bpp = max_t(u32, 18,
 438                                         min_t(u32, dp_panel->dp_mode.bpp, 30));
 439         DRM_DEBUG_DP("updated bpp = %d\n", dp_panel->dp_mode.bpp);
 440
 441         return 0;
 442 }
 443
 444 struct dp_panel *dp_panel_get(struct dp_panel_in *in)
 445 {
 446         struct dp_panel_private *panel;
 447         struct dp_panel *dp_panel;
 448
 449         if (!in->dev || !in->catalog || !in->aux || !in->link) {
 450                 DRM_ERROR("invalid input\n");
 451                 return ERR_PTR(-EINVAL);
 452         }
 453
 454         panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL);
 455         if (!panel)
 456                 return ERR_PTR(-ENOMEM);
 457
 458         panel->dev = in->dev;
 459         panel->aux = in->aux;
 460         panel->catalog = in->catalog;
 461         panel->link = in->link;
 462
 463         dp_panel = &panel->dp_panel;
 464         dp_panel->max_bw_code = DP_LINK_BW_8_1;
 465         panel->aux_cfg_update_done = false;
 466
 467         return dp_panel;
 468 }
 469
 470 void dp_panel_put(struct dp_panel *dp_panel)
 471 {
 472         if (!dp_panel)
 473                 return;
 474
 475         kfree(dp_panel->edid);
 476 }