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 DRM_DEBUG_DP("%s -", __func__); 145 return rc; 146 } 147 148 rc = drm_connector_update_edid_property(connector, NULL); 149 if (rc) 150 DRM_ERROR("failed to update edid property %d\n", rc); 151 152 return rc; 153 } 154 155 int dp_panel_read_sink_caps(struct dp_panel *dp_panel, 156 struct drm_connector *connector) 157 { 158 int rc = 0, bw_code; 159 int rlen, count; 160 struct dp_panel_private *panel; 161 162 if (!dp_panel || !connector) { 163 DRM_ERROR("invalid input\n"); 164 return -EINVAL; 165 } 166 167 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 168 169 rc = dp_panel_read_dpcd(dp_panel); 170 if (rc) { 171 DRM_ERROR("read dpcd failed %d\n", rc); 172 return rc; 173 } 174 175 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate); 176 if (!is_link_rate_valid(bw_code) || 177 !is_lane_count_valid(dp_panel->link_info.num_lanes) || 178 (bw_code > dp_panel->max_bw_code)) { 179 DRM_ERROR("Illegal link rate=%d lane=%d\n", dp_panel->link_info.rate, 180 dp_panel->link_info.num_lanes); 181 return -EINVAL; 182 } 183 184 if (dp_panel->dfp_present) { 185 rlen = drm_dp_dpcd_read(panel->aux, DP_SINK_COUNT, 186 &count, 1); 187 if (rlen == 1) { 188 count = DP_GET_SINK_COUNT(count); 189 if (!count) { 190 DRM_ERROR("no downstream ports connected\n"); 191 panel->link->sink_count = 0; 192 rc = -ENOTCONN; 193 goto end; 194 } 195 } 196 } 197 198 kfree(dp_panel->edid); 199 dp_panel->edid = NULL; 200 201 dp_panel->edid = drm_get_edid(connector, 202 &panel->aux->ddc); 203 if (!dp_panel->edid) { 204 DRM_ERROR("panel edid read failed\n"); 205 /* check edid read fail is due to unplug */ 206 if (!dp_catalog_link_is_connected(panel->catalog)) { 207 rc = -ETIMEDOUT; 208 goto end; 209 } 210 211 /* fail safe edid */ 212 mutex_lock(&connector->dev->mode_config.mutex); 213 if (drm_add_modes_noedid(connector, 640, 480)) 214 drm_set_preferred_mode(connector, 640, 480); 215 mutex_unlock(&connector->dev->mode_config.mutex); 216 } 217 218 if (panel->aux_cfg_update_done) { 219 DRM_DEBUG_DP("read DPCD with updated AUX config\n"); 220 rc = dp_panel_read_dpcd(dp_panel); 221 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate); 222 if (rc || !is_link_rate_valid(bw_code) || 223 !is_lane_count_valid(dp_panel->link_info.num_lanes) 224 || (bw_code > dp_panel->max_bw_code)) { 225 DRM_ERROR("read dpcd failed %d\n", rc); 226 return rc; 227 } 228 panel->aux_cfg_update_done = false; 229 } 230 end: 231 return rc; 232 } 233 234 u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel, 235 u32 mode_edid_bpp, u32 mode_pclk_khz) 236 { 237 struct dp_panel_private *panel; 238 u32 bpp = mode_edid_bpp; 239 240 if (!dp_panel || !mode_edid_bpp || !mode_pclk_khz) { 241 DRM_ERROR("invalid input\n"); 242 return 0; 243 } 244 245 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 246 247 if (dp_panel->video_test) 248 bpp = dp_link_bit_depth_to_bpp( 249 panel->link->test_video.test_bit_depth); 250 else 251 bpp = dp_panel_get_supported_bpp(dp_panel, mode_edid_bpp, 252 mode_pclk_khz); 253 254 return bpp; 255 } 256 257 int dp_panel_get_modes(struct dp_panel *dp_panel, 258 struct drm_connector *connector, struct dp_display_mode *mode) 259 { 260 if (!dp_panel) { 261 DRM_ERROR("invalid input\n"); 262 return -EINVAL; 263 } 264 265 if (dp_panel->edid) 266 return dp_panel_update_modes(connector, dp_panel->edid); 267 268 return 0; 269 } 270 271 static u8 dp_panel_get_edid_checksum(struct edid *edid) 272 { 273 struct edid *last_block; 274 u8 *raw_edid; 275 bool is_edid_corrupt; 276 277 if (!edid) { 278 DRM_ERROR("invalid edid input\n"); 279 return 0; 280 } 281 282 raw_edid = (u8 *)edid; 283 raw_edid += (edid->extensions * EDID_LENGTH); 284 last_block = (struct edid *)raw_edid; 285 286 /* block type extension */ 287 drm_edid_block_valid(raw_edid, 1, false, &is_edid_corrupt); 288 if (!is_edid_corrupt) 289 return last_block->checksum; 290 291 DRM_ERROR("Invalid block, no checksum\n"); 292 return 0; 293 } 294 295 void dp_panel_handle_sink_request(struct dp_panel *dp_panel) 296 { 297 struct dp_panel_private *panel; 298 299 if (!dp_panel) { 300 DRM_ERROR("invalid input\n"); 301 return; 302 } 303 304 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 305 306 if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) { 307 u8 checksum = dp_panel_get_edid_checksum(dp_panel->edid); 308 309 dp_link_send_edid_checksum(panel->link, checksum); 310 dp_link_send_test_response(panel->link); 311 } 312 } 313 314 void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable) 315 { 316 struct dp_catalog *catalog; 317 struct dp_panel_private *panel; 318 319 if (!dp_panel) { 320 DRM_ERROR("invalid input\n"); 321 return; 322 } 323 324 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 325 catalog = panel->catalog; 326 327 if (!panel->panel_on) { 328 DRM_DEBUG_DP("DP panel not enabled, handle TPG on next on\n"); 329 return; 330 } 331 332 if (!enable) { 333 dp_catalog_panel_tpg_disable(catalog); 334 return; 335 } 336 337 DRM_DEBUG_DP("%s: calling catalog tpg_enable\n", __func__); 338 dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode); 339 } 340 341 void dp_panel_dump_regs(struct dp_panel *dp_panel) 342 { 343 struct dp_catalog *catalog; 344 struct dp_panel_private *panel; 345 346 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 347 catalog = panel->catalog; 348 349 dp_catalog_dump_regs(catalog); 350 } 351 352 int dp_panel_timing_cfg(struct dp_panel *dp_panel) 353 { 354 int rc = 0; 355 u32 data, total_ver, total_hor; 356 struct dp_catalog *catalog; 357 struct dp_panel_private *panel; 358 struct drm_display_mode *drm_mode; 359 360 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 361 catalog = panel->catalog; 362 drm_mode = &panel->dp_panel.dp_mode.drm_mode; 363 364 DRM_DEBUG_DP("width=%d hporch= %d %d %d\n", 365 drm_mode->hdisplay, drm_mode->htotal - drm_mode->hsync_end, 366 drm_mode->hsync_start - drm_mode->hdisplay, 367 drm_mode->hsync_end - drm_mode->hsync_start); 368 369 DRM_DEBUG_DP("height=%d vporch= %d %d %d\n", 370 drm_mode->vdisplay, drm_mode->vtotal - drm_mode->vsync_end, 371 drm_mode->vsync_start - drm_mode->vdisplay, 372 drm_mode->vsync_end - drm_mode->vsync_start); 373 374 total_hor = drm_mode->htotal; 375 376 total_ver = drm_mode->vtotal; 377 378 data = total_ver; 379 data <<= 16; 380 data |= total_hor; 381 382 catalog->total = data; 383 384 data = (drm_mode->vtotal - drm_mode->vsync_start); 385 data <<= 16; 386 data |= (drm_mode->htotal - drm_mode->hsync_start); 387 388 catalog->sync_start = data; 389 390 data = drm_mode->vsync_end - drm_mode->vsync_start; 391 data <<= 16; 392 data |= (panel->dp_panel.dp_mode.v_active_low << 31); 393 data |= drm_mode->hsync_end - drm_mode->hsync_start; 394 data |= (panel->dp_panel.dp_mode.h_active_low << 15); 395 396 catalog->width_blanking = data; 397 398 data = drm_mode->vdisplay; 399 data <<= 16; 400 data |= drm_mode->hdisplay; 401 402 catalog->dp_active = data; 403 404 dp_catalog_panel_timing_cfg(catalog); 405 panel->panel_on = true; 406 407 return rc; 408 } 409 410 int dp_panel_init_panel_info(struct dp_panel *dp_panel) 411 { 412 struct drm_display_mode *drm_mode; 413 414 drm_mode = &dp_panel->dp_mode.drm_mode; 415 416 /* 417 * print resolution info as this is a result 418 * of user initiated action of cable connection 419 */ 420 DRM_DEBUG_DP("SET NEW RESOLUTION:\n"); 421 DRM_DEBUG_DP("%dx%d@%dfps\n", drm_mode->hdisplay, 422 drm_mode->vdisplay, drm_mode_vrefresh(drm_mode)); 423 DRM_DEBUG_DP("h_porches(back|front|width) = (%d|%d|%d)\n", 424 drm_mode->htotal - drm_mode->hsync_end, 425 drm_mode->hsync_start - drm_mode->hdisplay, 426 drm_mode->hsync_end - drm_mode->hsync_start); 427 DRM_DEBUG_DP("v_porches(back|front|width) = (%d|%d|%d)\n", 428 drm_mode->vtotal - drm_mode->vsync_end, 429 drm_mode->vsync_start - drm_mode->vdisplay, 430 drm_mode->vsync_end - drm_mode->vsync_start); 431 DRM_DEBUG_DP("pixel clock (KHz)=(%d)\n", drm_mode->clock); 432 DRM_DEBUG_DP("bpp = %d\n", dp_panel->dp_mode.bpp); 433 434 dp_panel->dp_mode.bpp = max_t(u32, 18, 435 min_t(u32, dp_panel->dp_mode.bpp, 30)); 436 DRM_DEBUG_DP("updated bpp = %d\n", dp_panel->dp_mode.bpp); 437 438 return 0; 439 } 440 441 struct dp_panel *dp_panel_get(struct dp_panel_in *in) 442 { 443 struct dp_panel_private *panel; 444 struct dp_panel *dp_panel; 445 446 if (!in->dev || !in->catalog || !in->aux || !in->link) { 447 DRM_ERROR("invalid input\n"); 448 return ERR_PTR(-EINVAL); 449 } 450 451 panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL); 452 if (!panel) 453 return ERR_PTR(-ENOMEM); 454 455 panel->dev = in->dev; 456 panel->aux = in->aux; 457 panel->catalog = in->catalog; 458 panel->link = in->link; 459 460 dp_panel = &panel->dp_panel; 461 dp_panel->max_bw_code = DP_LINK_BW_8_1; 462 panel->aux_cfg_update_done = false; 463 464 return dp_panel; 465 } 466 467 void dp_panel_put(struct dp_panel *dp_panel) 468 { 469 if (!dp_panel) 470 return; 471 472 kfree(dp_panel->edid); 473 } 474