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