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 drm_device *drm_dev; 15 struct dp_panel dp_panel; 16 struct drm_dp_aux *aux; 17 struct dp_link *link; 18 struct dp_catalog *catalog; 19 bool panel_on; 20 bool aux_cfg_update_done; 21 }; 22 23 static int dp_panel_read_dpcd(struct dp_panel *dp_panel) 24 { 25 int rc = 0; 26 size_t len; 27 ssize_t rlen; 28 struct dp_panel_private *panel; 29 struct dp_link_info *link_info; 30 u8 *dpcd, major = 0, minor = 0, temp; 31 u32 offset = DP_DPCD_REV; 32 33 dpcd = dp_panel->dpcd; 34 35 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 36 link_info = &dp_panel->link_info; 37 38 rlen = drm_dp_dpcd_read(panel->aux, offset, 39 dpcd, (DP_RECEIVER_CAP_SIZE + 1)); 40 if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) { 41 DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen); 42 if (rlen == -ETIMEDOUT) 43 rc = rlen; 44 else 45 rc = -EINVAL; 46 47 goto end; 48 } 49 50 temp = dpcd[DP_TRAINING_AUX_RD_INTERVAL]; 51 52 /* check for EXTENDED_RECEIVER_CAPABILITY_FIELD_PRESENT */ 53 if (temp & BIT(7)) { 54 drm_dbg_dp(panel->drm_dev, 55 "using EXTENDED_RECEIVER_CAPABILITY_FIELD\n"); 56 offset = DPRX_EXTENDED_DPCD_FIELD; 57 } 58 59 rlen = drm_dp_dpcd_read(panel->aux, offset, 60 dpcd, (DP_RECEIVER_CAP_SIZE + 1)); 61 if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) { 62 DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen); 63 if (rlen == -ETIMEDOUT) 64 rc = rlen; 65 else 66 rc = -EINVAL; 67 68 goto end; 69 } 70 71 link_info->revision = dpcd[DP_DPCD_REV]; 72 major = (link_info->revision >> 4) & 0x0f; 73 minor = link_info->revision & 0x0f; 74 75 link_info->rate = drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]); 76 link_info->num_lanes = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK; 77 78 if (link_info->num_lanes > dp_panel->max_dp_lanes) 79 link_info->num_lanes = dp_panel->max_dp_lanes; 80 81 /* Limit support upto HBR2 until HBR3 support is added */ 82 if (link_info->rate >= (drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4))) 83 link_info->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4); 84 85 drm_dbg_dp(panel->drm_dev, "version: %d.%d\n", major, minor); 86 drm_dbg_dp(panel->drm_dev, "link_rate=%d\n", link_info->rate); 87 drm_dbg_dp(panel->drm_dev, "lane_count=%d\n", link_info->num_lanes); 88 89 if (drm_dp_enhanced_frame_cap(dpcd)) 90 link_info->capabilities |= DP_LINK_CAP_ENHANCED_FRAMING; 91 92 dp_panel->dfp_present = dpcd[DP_DOWNSTREAMPORT_PRESENT]; 93 dp_panel->dfp_present &= DP_DWN_STRM_PORT_PRESENT; 94 95 if (dp_panel->dfp_present && (dpcd[DP_DPCD_REV] > 0x10)) { 96 dp_panel->ds_port_cnt = dpcd[DP_DOWN_STREAM_PORT_COUNT]; 97 dp_panel->ds_port_cnt &= DP_PORT_COUNT_MASK; 98 len = DP_DOWNSTREAM_PORTS * DP_DOWNSTREAM_CAP_SIZE; 99 100 rlen = drm_dp_dpcd_read(panel->aux, 101 DP_DOWNSTREAM_PORT_0, dp_panel->ds_cap_info, len); 102 if (rlen < len) { 103 DRM_ERROR("ds port status failed, rlen=%zd\n", rlen); 104 rc = -EINVAL; 105 goto end; 106 } 107 } 108 109 end: 110 return rc; 111 } 112 113 static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel, 114 u32 mode_edid_bpp, u32 mode_pclk_khz) 115 { 116 struct dp_link_info *link_info; 117 const u32 max_supported_bpp = 30, min_supported_bpp = 18; 118 u32 bpp = 0, data_rate_khz = 0; 119 120 bpp = min_t(u32, mode_edid_bpp, max_supported_bpp); 121 122 link_info = &dp_panel->link_info; 123 data_rate_khz = link_info->num_lanes * link_info->rate * 8; 124 125 while (bpp > min_supported_bpp) { 126 if (mode_pclk_khz * bpp <= data_rate_khz) 127 break; 128 bpp -= 6; 129 } 130 131 return bpp; 132 } 133 134 static int dp_panel_update_modes(struct drm_connector *connector, 135 struct edid *edid) 136 { 137 int rc = 0; 138 139 if (edid) { 140 rc = drm_connector_update_edid_property(connector, edid); 141 if (rc) { 142 DRM_ERROR("failed to update edid property %d\n", rc); 143 return rc; 144 } 145 rc = drm_add_edid_modes(connector, edid); 146 return rc; 147 } 148 149 rc = drm_connector_update_edid_property(connector, NULL); 150 if (rc) 151 DRM_ERROR("failed to update edid property %d\n", rc); 152 153 return rc; 154 } 155 156 int dp_panel_read_sink_caps(struct dp_panel *dp_panel, 157 struct drm_connector *connector) 158 { 159 int rc = 0, bw_code; 160 int rlen, count; 161 struct dp_panel_private *panel; 162 163 if (!dp_panel || !connector) { 164 DRM_ERROR("invalid input\n"); 165 return -EINVAL; 166 } 167 168 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 169 170 rc = dp_panel_read_dpcd(dp_panel); 171 if (rc) { 172 DRM_ERROR("read dpcd failed %d\n", rc); 173 return rc; 174 } 175 176 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate); 177 if (!is_link_rate_valid(bw_code) || 178 !is_lane_count_valid(dp_panel->link_info.num_lanes) || 179 (bw_code > dp_panel->max_bw_code)) { 180 DRM_ERROR("Illegal link rate=%d lane=%d\n", dp_panel->link_info.rate, 181 dp_panel->link_info.num_lanes); 182 return -EINVAL; 183 } 184 185 if (dp_panel->dfp_present) { 186 rlen = drm_dp_dpcd_read(panel->aux, DP_SINK_COUNT, 187 &count, 1); 188 if (rlen == 1) { 189 count = DP_GET_SINK_COUNT(count); 190 if (!count) { 191 DRM_ERROR("no downstream ports connected\n"); 192 panel->link->sink_count = 0; 193 rc = -ENOTCONN; 194 goto end; 195 } 196 } 197 } 198 199 kfree(dp_panel->edid); 200 dp_panel->edid = NULL; 201 202 dp_panel->edid = drm_get_edid(connector, 203 &panel->aux->ddc); 204 if (!dp_panel->edid) { 205 DRM_ERROR("panel edid read failed\n"); 206 /* check edid read fail is due to unplug */ 207 if (!dp_catalog_link_is_connected(panel->catalog)) { 208 rc = -ETIMEDOUT; 209 goto end; 210 } 211 } 212 213 if (panel->aux_cfg_update_done) { 214 drm_dbg_dp(panel->drm_dev, 215 "read DPCD with updated AUX config\n"); 216 rc = dp_panel_read_dpcd(dp_panel); 217 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate); 218 if (rc || !is_link_rate_valid(bw_code) || 219 !is_lane_count_valid(dp_panel->link_info.num_lanes) 220 || (bw_code > dp_panel->max_bw_code)) { 221 DRM_ERROR("read dpcd failed %d\n", rc); 222 return rc; 223 } 224 panel->aux_cfg_update_done = false; 225 } 226 end: 227 return rc; 228 } 229 230 u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel, 231 u32 mode_edid_bpp, u32 mode_pclk_khz) 232 { 233 struct dp_panel_private *panel; 234 u32 bpp; 235 236 if (!dp_panel || !mode_edid_bpp || !mode_pclk_khz) { 237 DRM_ERROR("invalid input\n"); 238 return 0; 239 } 240 241 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 242 243 if (dp_panel->video_test) 244 bpp = dp_link_bit_depth_to_bpp( 245 panel->link->test_video.test_bit_depth); 246 else 247 bpp = dp_panel_get_supported_bpp(dp_panel, mode_edid_bpp, 248 mode_pclk_khz); 249 250 return bpp; 251 } 252 253 int dp_panel_get_modes(struct dp_panel *dp_panel, 254 struct drm_connector *connector) 255 { 256 if (!dp_panel) { 257 DRM_ERROR("invalid input\n"); 258 return -EINVAL; 259 } 260 261 if (dp_panel->edid) 262 return dp_panel_update_modes(connector, dp_panel->edid); 263 264 return 0; 265 } 266 267 static u8 dp_panel_get_edid_checksum(struct edid *edid) 268 { 269 struct edid *last_block; 270 u8 *raw_edid; 271 bool is_edid_corrupt = false; 272 273 if (!edid) { 274 DRM_ERROR("invalid edid input\n"); 275 return 0; 276 } 277 278 raw_edid = (u8 *)edid; 279 raw_edid += (edid->extensions * EDID_LENGTH); 280 last_block = (struct edid *)raw_edid; 281 282 /* block type extension */ 283 drm_edid_block_valid(raw_edid, 1, false, &is_edid_corrupt); 284 if (!is_edid_corrupt) 285 return last_block->checksum; 286 287 DRM_ERROR("Invalid block, no checksum\n"); 288 return 0; 289 } 290 291 void dp_panel_handle_sink_request(struct dp_panel *dp_panel) 292 { 293 struct dp_panel_private *panel; 294 295 if (!dp_panel) { 296 DRM_ERROR("invalid input\n"); 297 return; 298 } 299 300 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 301 302 if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) { 303 u8 checksum; 304 305 if (dp_panel->edid) 306 checksum = dp_panel_get_edid_checksum(dp_panel->edid); 307 else 308 checksum = dp_panel->connector->real_edid_checksum; 309 310 dp_link_send_edid_checksum(panel->link, checksum); 311 dp_link_send_test_response(panel->link); 312 } 313 } 314 315 void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable) 316 { 317 struct dp_catalog *catalog; 318 struct dp_panel_private *panel; 319 320 if (!dp_panel) { 321 DRM_ERROR("invalid input\n"); 322 return; 323 } 324 325 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 326 catalog = panel->catalog; 327 328 if (!panel->panel_on) { 329 drm_dbg_dp(panel->drm_dev, 330 "DP panel not enabled, handle TPG on next on\n"); 331 return; 332 } 333 334 if (!enable) { 335 dp_catalog_panel_tpg_disable(catalog); 336 return; 337 } 338 339 drm_dbg_dp(panel->drm_dev, "calling catalog tpg_enable\n"); 340 dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode); 341 } 342 343 void dp_panel_dump_regs(struct dp_panel *dp_panel) 344 { 345 struct dp_catalog *catalog; 346 struct dp_panel_private *panel; 347 348 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 349 catalog = panel->catalog; 350 351 dp_catalog_dump_regs(catalog); 352 } 353 354 int dp_panel_timing_cfg(struct dp_panel *dp_panel) 355 { 356 u32 data, total_ver, total_hor; 357 struct dp_catalog *catalog; 358 struct dp_panel_private *panel; 359 struct drm_display_mode *drm_mode; 360 361 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 362 catalog = panel->catalog; 363 drm_mode = &panel->dp_panel.dp_mode.drm_mode; 364 365 drm_dbg_dp(panel->drm_dev, "width=%d hporch= %d %d %d\n", 366 drm_mode->hdisplay, drm_mode->htotal - drm_mode->hsync_end, 367 drm_mode->hsync_start - drm_mode->hdisplay, 368 drm_mode->hsync_end - drm_mode->hsync_start); 369 370 drm_dbg_dp(panel->drm_dev, "height=%d vporch= %d %d %d\n", 371 drm_mode->vdisplay, drm_mode->vtotal - drm_mode->vsync_end, 372 drm_mode->vsync_start - drm_mode->vdisplay, 373 drm_mode->vsync_end - drm_mode->vsync_start); 374 375 total_hor = drm_mode->htotal; 376 377 total_ver = drm_mode->vtotal; 378 379 data = total_ver; 380 data <<= 16; 381 data |= total_hor; 382 383 catalog->total = data; 384 385 data = (drm_mode->vtotal - drm_mode->vsync_start); 386 data <<= 16; 387 data |= (drm_mode->htotal - drm_mode->hsync_start); 388 389 catalog->sync_start = data; 390 391 data = drm_mode->vsync_end - drm_mode->vsync_start; 392 data <<= 16; 393 data |= (panel->dp_panel.dp_mode.v_active_low << 31); 394 data |= drm_mode->hsync_end - drm_mode->hsync_start; 395 data |= (panel->dp_panel.dp_mode.h_active_low << 15); 396 397 catalog->width_blanking = data; 398 399 data = drm_mode->vdisplay; 400 data <<= 16; 401 data |= drm_mode->hdisplay; 402 403 catalog->dp_active = data; 404 405 dp_catalog_panel_timing_cfg(catalog); 406 panel->panel_on = true; 407 408 return 0; 409 } 410 411 int dp_panel_init_panel_info(struct dp_panel *dp_panel) 412 { 413 struct drm_display_mode *drm_mode; 414 struct dp_panel_private *panel; 415 416 drm_mode = &dp_panel->dp_mode.drm_mode; 417 418 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 419 420 /* 421 * print resolution info as this is a result 422 * of user initiated action of cable connection 423 */ 424 drm_dbg_dp(panel->drm_dev, "SET NEW RESOLUTION:\n"); 425 drm_dbg_dp(panel->drm_dev, "%dx%d@%dfps\n", 426 drm_mode->hdisplay, drm_mode->vdisplay, drm_mode_vrefresh(drm_mode)); 427 drm_dbg_dp(panel->drm_dev, 428 "h_porches(back|front|width) = (%d|%d|%d)\n", 429 drm_mode->htotal - drm_mode->hsync_end, 430 drm_mode->hsync_start - drm_mode->hdisplay, 431 drm_mode->hsync_end - drm_mode->hsync_start); 432 drm_dbg_dp(panel->drm_dev, 433 "v_porches(back|front|width) = (%d|%d|%d)\n", 434 drm_mode->vtotal - drm_mode->vsync_end, 435 drm_mode->vsync_start - drm_mode->vdisplay, 436 drm_mode->vsync_end - drm_mode->vsync_start); 437 drm_dbg_dp(panel->drm_dev, "pixel clock (KHz)=(%d)\n", 438 drm_mode->clock); 439 drm_dbg_dp(panel->drm_dev, "bpp = %d\n", dp_panel->dp_mode.bpp); 440 441 dp_panel->dp_mode.bpp = max_t(u32, 18, 442 min_t(u32, dp_panel->dp_mode.bpp, 30)); 443 drm_dbg_dp(panel->drm_dev, "updated bpp = %d\n", 444 dp_panel->dp_mode.bpp); 445 446 return 0; 447 } 448 449 struct dp_panel *dp_panel_get(struct dp_panel_in *in) 450 { 451 struct dp_panel_private *panel; 452 struct dp_panel *dp_panel; 453 454 if (!in->dev || !in->catalog || !in->aux || !in->link) { 455 DRM_ERROR("invalid input\n"); 456 return ERR_PTR(-EINVAL); 457 } 458 459 panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL); 460 if (!panel) 461 return ERR_PTR(-ENOMEM); 462 463 panel->dev = in->dev; 464 panel->aux = in->aux; 465 panel->catalog = in->catalog; 466 panel->link = in->link; 467 468 dp_panel = &panel->dp_panel; 469 dp_panel->max_bw_code = DP_LINK_BW_8_1; 470 panel->aux_cfg_update_done = false; 471 472 return dp_panel; 473 } 474 475 void dp_panel_put(struct dp_panel *dp_panel) 476 { 477 if (!dp_panel) 478 return; 479 480 kfree(dp_panel->edid); 481 } 482