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