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 #include "dp_utils.h" 8 9 #include <drm/drm_connector.h> 10 #include <drm/drm_edid.h> 11 #include <drm/drm_of.h> 12 #include <drm/drm_print.h> 13 14 #define DP_MAX_NUM_DP_LANES 4 15 #define DP_LINK_RATE_HBR2 540000 /* kbytes */ 16 17 struct dp_panel_private { 18 struct device *dev; 19 struct drm_device *drm_dev; 20 struct dp_panel dp_panel; 21 struct drm_dp_aux *aux; 22 struct dp_link *link; 23 struct dp_catalog *catalog; 24 bool panel_on; 25 }; 26 27 static void dp_panel_read_psr_cap(struct dp_panel_private *panel) 28 { 29 ssize_t rlen; 30 struct dp_panel *dp_panel; 31 32 dp_panel = &panel->dp_panel; 33 34 /* edp sink */ 35 if (dp_panel->dpcd[DP_EDP_CONFIGURATION_CAP]) { 36 rlen = drm_dp_dpcd_read(panel->aux, DP_PSR_SUPPORT, 37 &dp_panel->psr_cap, sizeof(dp_panel->psr_cap)); 38 if (rlen == sizeof(dp_panel->psr_cap)) { 39 drm_dbg_dp(panel->drm_dev, 40 "psr version: 0x%x, psr_cap: 0x%x\n", 41 dp_panel->psr_cap.version, 42 dp_panel->psr_cap.capabilities); 43 } else 44 DRM_ERROR("failed to read psr info, rlen=%zd\n", rlen); 45 } 46 } 47 48 static int dp_panel_read_dpcd(struct dp_panel *dp_panel) 49 { 50 int rc; 51 struct dp_panel_private *panel; 52 struct dp_link_info *link_info; 53 u8 *dpcd, major, minor; 54 55 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 56 dpcd = dp_panel->dpcd; 57 rc = drm_dp_read_dpcd_caps(panel->aux, dpcd); 58 if (rc) 59 return rc; 60 61 dp_panel->vsc_sdp_supported = drm_dp_vsc_sdp_supported(panel->aux, dpcd); 62 link_info = &dp_panel->link_info; 63 link_info->revision = dpcd[DP_DPCD_REV]; 64 major = (link_info->revision >> 4) & 0x0f; 65 minor = link_info->revision & 0x0f; 66 67 link_info->rate = drm_dp_max_link_rate(dpcd); 68 link_info->num_lanes = drm_dp_max_lane_count(dpcd); 69 70 /* Limit data lanes from data-lanes of endpoint property of dtsi */ 71 if (link_info->num_lanes > dp_panel->max_dp_lanes) 72 link_info->num_lanes = dp_panel->max_dp_lanes; 73 74 /* Limit link rate from link-frequencies of endpoint property of dtsi */ 75 if (link_info->rate > dp_panel->max_dp_link_rate) 76 link_info->rate = dp_panel->max_dp_link_rate; 77 78 drm_dbg_dp(panel->drm_dev, "version: %d.%d\n", major, minor); 79 drm_dbg_dp(panel->drm_dev, "link_rate=%d\n", link_info->rate); 80 drm_dbg_dp(panel->drm_dev, "lane_count=%d\n", link_info->num_lanes); 81 82 if (drm_dp_enhanced_frame_cap(dpcd)) 83 link_info->capabilities |= DP_LINK_CAP_ENHANCED_FRAMING; 84 85 dp_panel_read_psr_cap(panel); 86 87 return rc; 88 } 89 90 static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel, 91 u32 mode_edid_bpp, u32 mode_pclk_khz) 92 { 93 const struct dp_link_info *link_info; 94 const u32 max_supported_bpp = 30, min_supported_bpp = 18; 95 u32 bpp, data_rate_khz; 96 97 bpp = min(mode_edid_bpp, max_supported_bpp); 98 99 link_info = &dp_panel->link_info; 100 data_rate_khz = link_info->num_lanes * link_info->rate * 8; 101 102 do { 103 if (mode_pclk_khz * bpp <= data_rate_khz) 104 return bpp; 105 bpp -= 6; 106 } while (bpp > min_supported_bpp); 107 108 return min_supported_bpp; 109 } 110 111 int dp_panel_read_sink_caps(struct dp_panel *dp_panel, 112 struct drm_connector *connector) 113 { 114 int rc, bw_code; 115 int count; 116 struct dp_panel_private *panel; 117 118 if (!dp_panel || !connector) { 119 DRM_ERROR("invalid input\n"); 120 return -EINVAL; 121 } 122 123 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 124 125 drm_dbg_dp(panel->drm_dev, "max_lanes=%d max_link_rate=%d\n", 126 dp_panel->max_dp_lanes, dp_panel->max_dp_link_rate); 127 128 rc = dp_panel_read_dpcd(dp_panel); 129 if (rc) { 130 DRM_ERROR("read dpcd failed %d\n", rc); 131 return rc; 132 } 133 134 bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate); 135 if (!is_link_rate_valid(bw_code) || 136 !is_lane_count_valid(dp_panel->link_info.num_lanes) || 137 (bw_code > dp_panel->max_bw_code)) { 138 DRM_ERROR("Illegal link rate=%d lane=%d\n", dp_panel->link_info.rate, 139 dp_panel->link_info.num_lanes); 140 return -EINVAL; 141 } 142 143 if (drm_dp_is_branch(dp_panel->dpcd)) { 144 count = drm_dp_read_sink_count(panel->aux); 145 if (!count) { 146 panel->link->sink_count = 0; 147 return -ENOTCONN; 148 } 149 } 150 151 rc = drm_dp_read_downstream_info(panel->aux, dp_panel->dpcd, 152 dp_panel->downstream_ports); 153 if (rc) 154 return rc; 155 156 drm_edid_free(dp_panel->drm_edid); 157 158 dp_panel->drm_edid = drm_edid_read_ddc(connector, &panel->aux->ddc); 159 160 drm_edid_connector_update(connector, dp_panel->drm_edid); 161 162 if (!dp_panel->drm_edid) { 163 DRM_ERROR("panel edid read failed\n"); 164 /* check edid read fail is due to unplug */ 165 if (!dp_catalog_link_is_connected(panel->catalog)) { 166 rc = -ETIMEDOUT; 167 goto end; 168 } 169 } 170 171 end: 172 return rc; 173 } 174 175 u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel, 176 u32 mode_edid_bpp, u32 mode_pclk_khz) 177 { 178 struct dp_panel_private *panel; 179 u32 bpp; 180 181 if (!dp_panel || !mode_edid_bpp || !mode_pclk_khz) { 182 DRM_ERROR("invalid input\n"); 183 return 0; 184 } 185 186 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 187 188 if (dp_panel->video_test) 189 bpp = dp_link_bit_depth_to_bpp( 190 panel->link->test_video.test_bit_depth); 191 else 192 bpp = dp_panel_get_supported_bpp(dp_panel, mode_edid_bpp, 193 mode_pclk_khz); 194 195 return bpp; 196 } 197 198 int dp_panel_get_modes(struct dp_panel *dp_panel, 199 struct drm_connector *connector) 200 { 201 if (!dp_panel) { 202 DRM_ERROR("invalid input\n"); 203 return -EINVAL; 204 } 205 206 if (dp_panel->drm_edid) 207 return drm_edid_connector_add_modes(connector); 208 209 return 0; 210 } 211 212 static u8 dp_panel_get_edid_checksum(const struct edid *edid) 213 { 214 edid += edid->extensions; 215 216 return edid->checksum; 217 } 218 219 void dp_panel_handle_sink_request(struct dp_panel *dp_panel) 220 { 221 struct dp_panel_private *panel; 222 223 if (!dp_panel) { 224 DRM_ERROR("invalid input\n"); 225 return; 226 } 227 228 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 229 230 if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) { 231 /* FIXME: get rid of drm_edid_raw() */ 232 const struct edid *edid = drm_edid_raw(dp_panel->drm_edid); 233 u8 checksum; 234 235 if (edid) 236 checksum = dp_panel_get_edid_checksum(edid); 237 else 238 checksum = dp_panel->connector->real_edid_checksum; 239 240 dp_link_send_edid_checksum(panel->link, checksum); 241 dp_link_send_test_response(panel->link); 242 } 243 } 244 245 void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable) 246 { 247 struct dp_catalog *catalog; 248 struct dp_panel_private *panel; 249 250 if (!dp_panel) { 251 DRM_ERROR("invalid input\n"); 252 return; 253 } 254 255 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 256 catalog = panel->catalog; 257 258 if (!panel->panel_on) { 259 drm_dbg_dp(panel->drm_dev, 260 "DP panel not enabled, handle TPG on next on\n"); 261 return; 262 } 263 264 if (!enable) { 265 dp_catalog_panel_tpg_disable(catalog); 266 return; 267 } 268 269 drm_dbg_dp(panel->drm_dev, "calling catalog tpg_enable\n"); 270 dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode); 271 } 272 273 static int dp_panel_setup_vsc_sdp_yuv_420(struct dp_panel *dp_panel) 274 { 275 struct dp_catalog *catalog; 276 struct dp_panel_private *panel; 277 struct dp_display_mode *dp_mode; 278 struct drm_dp_vsc_sdp vsc_sdp_data; 279 struct dp_sdp vsc_sdp; 280 ssize_t len; 281 282 if (!dp_panel) { 283 DRM_ERROR("invalid input\n"); 284 return -EINVAL; 285 } 286 287 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 288 catalog = panel->catalog; 289 dp_mode = &dp_panel->dp_mode; 290 291 memset(&vsc_sdp_data, 0, sizeof(vsc_sdp_data)); 292 293 /* VSC SDP header as per table 2-118 of DP 1.4 specification */ 294 vsc_sdp_data.sdp_type = DP_SDP_VSC; 295 vsc_sdp_data.revision = 0x05; 296 vsc_sdp_data.length = 0x13; 297 298 /* VSC SDP Payload for DB16 */ 299 vsc_sdp_data.pixelformat = DP_PIXELFORMAT_YUV420; 300 vsc_sdp_data.colorimetry = DP_COLORIMETRY_DEFAULT; 301 302 /* VSC SDP Payload for DB17 */ 303 vsc_sdp_data.bpc = dp_mode->bpp / 3; 304 vsc_sdp_data.dynamic_range = DP_DYNAMIC_RANGE_CTA; 305 306 /* VSC SDP Payload for DB18 */ 307 vsc_sdp_data.content_type = DP_CONTENT_TYPE_GRAPHICS; 308 309 len = drm_dp_vsc_sdp_pack(&vsc_sdp_data, &vsc_sdp); 310 if (len < 0) { 311 DRM_ERROR("unable to pack vsc sdp\n"); 312 return len; 313 } 314 315 dp_catalog_panel_enable_vsc_sdp(catalog, &vsc_sdp); 316 317 return 0; 318 } 319 320 void dp_panel_dump_regs(struct dp_panel *dp_panel) 321 { 322 struct dp_catalog *catalog; 323 struct dp_panel_private *panel; 324 325 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 326 catalog = panel->catalog; 327 328 dp_catalog_dump_regs(catalog); 329 } 330 331 int dp_panel_timing_cfg(struct dp_panel *dp_panel) 332 { 333 u32 data, total_ver, total_hor; 334 struct dp_catalog *catalog; 335 struct dp_panel_private *panel; 336 struct drm_display_mode *drm_mode; 337 u32 width_blanking; 338 u32 sync_start; 339 u32 dp_active; 340 u32 total; 341 342 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 343 catalog = panel->catalog; 344 drm_mode = &panel->dp_panel.dp_mode.drm_mode; 345 346 drm_dbg_dp(panel->drm_dev, "width=%d hporch= %d %d %d\n", 347 drm_mode->hdisplay, drm_mode->htotal - drm_mode->hsync_end, 348 drm_mode->hsync_start - drm_mode->hdisplay, 349 drm_mode->hsync_end - drm_mode->hsync_start); 350 351 drm_dbg_dp(panel->drm_dev, "height=%d vporch= %d %d %d\n", 352 drm_mode->vdisplay, drm_mode->vtotal - drm_mode->vsync_end, 353 drm_mode->vsync_start - drm_mode->vdisplay, 354 drm_mode->vsync_end - drm_mode->vsync_start); 355 356 total_hor = drm_mode->htotal; 357 358 total_ver = drm_mode->vtotal; 359 360 data = total_ver; 361 data <<= 16; 362 data |= total_hor; 363 364 total = data; 365 366 data = (drm_mode->vtotal - drm_mode->vsync_start); 367 data <<= 16; 368 data |= (drm_mode->htotal - drm_mode->hsync_start); 369 370 sync_start = data; 371 372 data = drm_mode->vsync_end - drm_mode->vsync_start; 373 data <<= 16; 374 data |= (panel->dp_panel.dp_mode.v_active_low << 31); 375 data |= drm_mode->hsync_end - drm_mode->hsync_start; 376 data |= (panel->dp_panel.dp_mode.h_active_low << 15); 377 378 width_blanking = data; 379 380 data = drm_mode->vdisplay; 381 data <<= 16; 382 data |= drm_mode->hdisplay; 383 384 dp_active = data; 385 386 dp_catalog_panel_timing_cfg(catalog, total, sync_start, width_blanking, dp_active); 387 388 if (dp_panel->dp_mode.out_fmt_is_yuv_420) 389 dp_panel_setup_vsc_sdp_yuv_420(dp_panel); 390 391 panel->panel_on = true; 392 393 return 0; 394 } 395 396 int dp_panel_init_panel_info(struct dp_panel *dp_panel) 397 { 398 struct drm_display_mode *drm_mode; 399 struct dp_panel_private *panel; 400 401 drm_mode = &dp_panel->dp_mode.drm_mode; 402 403 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 404 405 /* 406 * print resolution info as this is a result 407 * of user initiated action of cable connection 408 */ 409 drm_dbg_dp(panel->drm_dev, "SET NEW RESOLUTION:\n"); 410 drm_dbg_dp(panel->drm_dev, "%dx%d@%dfps\n", 411 drm_mode->hdisplay, drm_mode->vdisplay, drm_mode_vrefresh(drm_mode)); 412 drm_dbg_dp(panel->drm_dev, 413 "h_porches(back|front|width) = (%d|%d|%d)\n", 414 drm_mode->htotal - drm_mode->hsync_end, 415 drm_mode->hsync_start - drm_mode->hdisplay, 416 drm_mode->hsync_end - drm_mode->hsync_start); 417 drm_dbg_dp(panel->drm_dev, 418 "v_porches(back|front|width) = (%d|%d|%d)\n", 419 drm_mode->vtotal - drm_mode->vsync_end, 420 drm_mode->vsync_start - drm_mode->vdisplay, 421 drm_mode->vsync_end - drm_mode->vsync_start); 422 drm_dbg_dp(panel->drm_dev, "pixel clock (KHz)=(%d)\n", 423 drm_mode->clock); 424 drm_dbg_dp(panel->drm_dev, "bpp = %d\n", dp_panel->dp_mode.bpp); 425 426 dp_panel->dp_mode.bpp = dp_panel_get_mode_bpp(dp_panel, dp_panel->dp_mode.bpp, 427 dp_panel->dp_mode.drm_mode.clock); 428 429 drm_dbg_dp(panel->drm_dev, "updated bpp = %d\n", 430 dp_panel->dp_mode.bpp); 431 432 return 0; 433 } 434 435 static u32 dp_panel_link_frequencies(struct device_node *of_node) 436 { 437 struct device_node *endpoint; 438 u64 frequency = 0; 439 int cnt; 440 441 endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */ 442 if (!endpoint) 443 return 0; 444 445 cnt = of_property_count_u64_elems(endpoint, "link-frequencies"); 446 447 if (cnt > 0) 448 of_property_read_u64_index(endpoint, "link-frequencies", 449 cnt - 1, &frequency); 450 of_node_put(endpoint); 451 452 do_div(frequency, 453 10 * /* from symbol rate to link rate */ 454 1000); /* kbytes */ 455 456 return frequency; 457 } 458 459 static int dp_panel_parse_dt(struct dp_panel *dp_panel) 460 { 461 struct dp_panel_private *panel; 462 struct device_node *of_node; 463 int cnt; 464 465 panel = container_of(dp_panel, struct dp_panel_private, dp_panel); 466 of_node = panel->dev->of_node; 467 468 /* 469 * data-lanes is the property of dp_out endpoint 470 */ 471 cnt = drm_of_get_data_lanes_count_ep(of_node, 1, 0, 1, DP_MAX_NUM_DP_LANES); 472 if (cnt < 0) { 473 /* legacy code, data-lanes is the property of mdss_dp node */ 474 cnt = drm_of_get_data_lanes_count(of_node, 1, DP_MAX_NUM_DP_LANES); 475 } 476 477 if (cnt > 0) 478 dp_panel->max_dp_lanes = cnt; 479 else 480 dp_panel->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */ 481 482 dp_panel->max_dp_link_rate = dp_panel_link_frequencies(of_node); 483 if (!dp_panel->max_dp_link_rate) 484 dp_panel->max_dp_link_rate = DP_LINK_RATE_HBR2; 485 486 return 0; 487 } 488 489 struct dp_panel *dp_panel_get(struct dp_panel_in *in) 490 { 491 struct dp_panel_private *panel; 492 struct dp_panel *dp_panel; 493 int ret; 494 495 if (!in->dev || !in->catalog || !in->aux || !in->link) { 496 DRM_ERROR("invalid input\n"); 497 return ERR_PTR(-EINVAL); 498 } 499 500 panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL); 501 if (!panel) 502 return ERR_PTR(-ENOMEM); 503 504 panel->dev = in->dev; 505 panel->aux = in->aux; 506 panel->catalog = in->catalog; 507 panel->link = in->link; 508 509 dp_panel = &panel->dp_panel; 510 dp_panel->max_bw_code = DP_LINK_BW_8_1; 511 512 ret = dp_panel_parse_dt(dp_panel); 513 if (ret) 514 return ERR_PTR(ret); 515 516 return dp_panel; 517 } 518 519 void dp_panel_put(struct dp_panel *dp_panel) 520 { 521 if (!dp_panel) 522 return; 523 524 drm_edid_free(dp_panel->drm_edid); 525 } 526