1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Rockchip Electronics Co., Ltd. 4 * Author: Chris Zhong <zyw@rock-chips.com> 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/component.h> 9 #include <linux/extcon.h> 10 #include <linux/firmware.h> 11 #include <linux/mfd/syscon.h> 12 #include <linux/phy/phy.h> 13 #include <linux/regmap.h> 14 #include <linux/reset.h> 15 16 #include <sound/hdmi-codec.h> 17 18 #include <drm/display/drm_dp_helper.h> 19 #include <drm/display/drm_hdmi_audio_helper.h> 20 #include <drm/drm_atomic_helper.h> 21 #include <drm/drm_bridge_connector.h> 22 #include <drm/drm_edid.h> 23 #include <drm/drm_of.h> 24 #include <drm/drm_print.h> 25 #include <drm/drm_probe_helper.h> 26 #include <drm/drm_simple_kms_helper.h> 27 28 #include "cdn-dp-core.h" 29 #include "cdn-dp-reg.h" 30 31 static inline struct cdn_dp_device *bridge_to_dp(struct drm_bridge *bridge) 32 { 33 return container_of(bridge, struct cdn_dp_device, bridge); 34 } 35 36 static inline struct cdn_dp_device *encoder_to_dp(struct drm_encoder *encoder) 37 { 38 struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder); 39 40 return container_of(rkencoder, struct cdn_dp_device, encoder); 41 } 42 43 #define GRF_SOC_CON9 0x6224 44 #define DP_SEL_VOP_LIT BIT(12) 45 #define GRF_SOC_CON26 0x6268 46 #define DPTX_HPD_SEL (3 << 12) 47 #define DPTX_HPD_DEL (2 << 12) 48 #define DPTX_HPD_SEL_MASK (3 << 28) 49 50 #define CDN_FW_TIMEOUT_MS (64 * 1000) 51 #define CDN_DPCD_TIMEOUT_MS 5000 52 #define CDN_DP_FIRMWARE "rockchip/dptx.bin" 53 MODULE_FIRMWARE(CDN_DP_FIRMWARE); 54 55 struct cdn_dp_data { 56 u8 max_phy; 57 }; 58 59 static struct cdn_dp_data rk3399_cdn_dp = { 60 .max_phy = 2, 61 }; 62 63 static const struct of_device_id cdn_dp_dt_ids[] = { 64 { .compatible = "rockchip,rk3399-cdn-dp", 65 .data = (void *)&rk3399_cdn_dp }, 66 {} 67 }; 68 69 MODULE_DEVICE_TABLE(of, cdn_dp_dt_ids); 70 71 static int cdn_dp_grf_write(struct cdn_dp_device *dp, 72 unsigned int reg, unsigned int val) 73 { 74 int ret; 75 76 ret = clk_prepare_enable(dp->grf_clk); 77 if (ret) { 78 DRM_DEV_ERROR(dp->dev, "Failed to prepare_enable grf clock\n"); 79 return ret; 80 } 81 82 ret = regmap_write(dp->grf, reg, val); 83 if (ret) { 84 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret); 85 clk_disable_unprepare(dp->grf_clk); 86 return ret; 87 } 88 89 clk_disable_unprepare(dp->grf_clk); 90 91 return 0; 92 } 93 94 static int cdn_dp_clk_enable(struct cdn_dp_device *dp) 95 { 96 int ret; 97 unsigned long rate; 98 99 ret = clk_prepare_enable(dp->pclk); 100 if (ret < 0) { 101 DRM_DEV_ERROR(dp->dev, "cannot enable dp pclk %d\n", ret); 102 goto err_pclk; 103 } 104 105 ret = clk_prepare_enable(dp->core_clk); 106 if (ret < 0) { 107 DRM_DEV_ERROR(dp->dev, "cannot enable core_clk %d\n", ret); 108 goto err_core_clk; 109 } 110 111 ret = pm_runtime_get_sync(dp->dev); 112 if (ret < 0) { 113 DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret); 114 goto err_pm_runtime_get; 115 } 116 117 reset_control_assert(dp->core_rst); 118 reset_control_assert(dp->dptx_rst); 119 reset_control_assert(dp->apb_rst); 120 reset_control_deassert(dp->core_rst); 121 reset_control_deassert(dp->dptx_rst); 122 reset_control_deassert(dp->apb_rst); 123 124 rate = clk_get_rate(dp->core_clk); 125 if (!rate) { 126 DRM_DEV_ERROR(dp->dev, "get clk rate failed\n"); 127 ret = -EINVAL; 128 goto err_set_rate; 129 } 130 131 cdn_dp_set_fw_clk(dp, rate); 132 cdn_dp_clock_reset(dp); 133 134 return 0; 135 136 err_set_rate: 137 pm_runtime_put(dp->dev); 138 err_pm_runtime_get: 139 clk_disable_unprepare(dp->core_clk); 140 err_core_clk: 141 clk_disable_unprepare(dp->pclk); 142 err_pclk: 143 return ret; 144 } 145 146 static void cdn_dp_clk_disable(struct cdn_dp_device *dp) 147 { 148 pm_runtime_put_sync(dp->dev); 149 clk_disable_unprepare(dp->pclk); 150 clk_disable_unprepare(dp->core_clk); 151 } 152 153 static int cdn_dp_get_port_lanes(struct cdn_dp_port *port) 154 { 155 struct extcon_dev *edev = port->extcon; 156 union extcon_property_value property; 157 int dptx; 158 u8 lanes; 159 160 dptx = extcon_get_state(edev, EXTCON_DISP_DP); 161 if (dptx > 0) { 162 extcon_get_property(edev, EXTCON_DISP_DP, 163 EXTCON_PROP_USB_SS, &property); 164 if (property.intval) 165 lanes = 2; 166 else 167 lanes = 4; 168 } else { 169 lanes = 0; 170 } 171 172 return lanes; 173 } 174 175 static int cdn_dp_get_sink_count(struct cdn_dp_device *dp, u8 *sink_count) 176 { 177 int ret; 178 u8 value; 179 180 *sink_count = 0; 181 ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &value, 1); 182 if (ret) 183 return ret; 184 185 *sink_count = DP_GET_SINK_COUNT(value); 186 return 0; 187 } 188 189 static struct cdn_dp_port *cdn_dp_connected_port(struct cdn_dp_device *dp) 190 { 191 struct cdn_dp_port *port; 192 int i, lanes; 193 194 for (i = 0; i < dp->ports; i++) { 195 port = dp->port[i]; 196 lanes = cdn_dp_get_port_lanes(port); 197 if (lanes) 198 return port; 199 } 200 return NULL; 201 } 202 203 static bool cdn_dp_check_sink_connection(struct cdn_dp_device *dp) 204 { 205 unsigned long timeout = jiffies + msecs_to_jiffies(CDN_DPCD_TIMEOUT_MS); 206 struct cdn_dp_port *port; 207 u8 sink_count = 0; 208 209 if (dp->active_port < 0 || dp->active_port >= dp->ports) { 210 DRM_DEV_ERROR(dp->dev, "active_port is wrong!\n"); 211 return false; 212 } 213 214 port = dp->port[dp->active_port]; 215 216 /* 217 * Attempt to read sink count, retry in case the sink may not be ready. 218 * 219 * Sinks are *supposed* to come up within 1ms from an off state, but 220 * some docks need more time to power up. 221 */ 222 while (time_before(jiffies, timeout)) { 223 if (!extcon_get_state(port->extcon, EXTCON_DISP_DP)) 224 return false; 225 226 if (!cdn_dp_get_sink_count(dp, &sink_count)) 227 return sink_count ? true : false; 228 229 usleep_range(5000, 10000); 230 } 231 232 DRM_DEV_ERROR(dp->dev, "Get sink capability timed out\n"); 233 return false; 234 } 235 236 static enum drm_connector_status 237 cdn_dp_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector) 238 { 239 struct cdn_dp_device *dp = bridge_to_dp(bridge); 240 enum drm_connector_status status = connector_status_disconnected; 241 242 mutex_lock(&dp->lock); 243 if (dp->connected) 244 status = connector_status_connected; 245 mutex_unlock(&dp->lock); 246 247 return status; 248 } 249 250 static const struct drm_edid * 251 cdn_dp_bridge_edid_read(struct drm_bridge *bridge, struct drm_connector *connector) 252 { 253 struct cdn_dp_device *dp = bridge_to_dp(bridge); 254 const struct drm_edid *drm_edid; 255 256 mutex_lock(&dp->lock); 257 drm_edid = drm_edid_read_custom(connector, cdn_dp_get_edid_block, dp); 258 mutex_unlock(&dp->lock); 259 260 return drm_edid; 261 } 262 263 static enum drm_mode_status 264 cdn_dp_bridge_mode_valid(struct drm_bridge *bridge, 265 const struct drm_display_info *display_info, 266 const struct drm_display_mode *mode) 267 { 268 struct cdn_dp_device *dp = bridge_to_dp(bridge); 269 u32 requested, actual, rate, sink_max, source_max = 0; 270 u8 lanes, bpc; 271 272 /* If DP is disconnected, every mode is invalid */ 273 if (!dp->connected) 274 return MODE_BAD; 275 276 switch (display_info->bpc) { 277 case 10: 278 bpc = 10; 279 break; 280 case 6: 281 bpc = 6; 282 break; 283 default: 284 bpc = 8; 285 break; 286 } 287 288 requested = mode->clock * bpc * 3 / 1000; 289 290 source_max = dp->lanes; 291 sink_max = drm_dp_max_lane_count(dp->dpcd); 292 lanes = min(source_max, sink_max); 293 294 source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE); 295 sink_max = drm_dp_max_link_rate(dp->dpcd); 296 rate = min(source_max, sink_max); 297 298 actual = rate * lanes / 100; 299 300 /* efficiency is about 0.8 */ 301 actual = actual * 8 / 10; 302 303 if (requested > actual) { 304 DRM_DEV_DEBUG_KMS(dp->dev, 305 "requested=%d, actual=%d, clock=%d\n", 306 requested, actual, mode->clock); 307 return MODE_CLOCK_HIGH; 308 } 309 310 return MODE_OK; 311 } 312 313 static int cdn_dp_firmware_init(struct cdn_dp_device *dp) 314 { 315 int ret; 316 const u32 *iram_data, *dram_data; 317 const struct firmware *fw = dp->fw; 318 const struct cdn_firmware_header *hdr; 319 320 hdr = (struct cdn_firmware_header *)fw->data; 321 if (fw->size != le32_to_cpu(hdr->size_bytes)) { 322 DRM_DEV_ERROR(dp->dev, "firmware is invalid\n"); 323 return -EINVAL; 324 } 325 326 iram_data = (const u32 *)(fw->data + hdr->header_size); 327 dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size); 328 329 ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size, 330 dram_data, hdr->dram_size); 331 if (ret) 332 return ret; 333 334 ret = cdn_dp_set_firmware_active(dp, true); 335 if (ret) { 336 DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret); 337 return ret; 338 } 339 340 return cdn_dp_event_config(dp); 341 } 342 343 static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp) 344 { 345 int ret; 346 347 if (!cdn_dp_check_sink_connection(dp)) 348 return -ENODEV; 349 350 ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd, 351 DP_RECEIVER_CAP_SIZE); 352 if (ret) { 353 DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret); 354 return ret; 355 } 356 357 return 0; 358 } 359 360 static int cdn_dp_enable_phy(struct cdn_dp_device *dp, struct cdn_dp_port *port) 361 { 362 union extcon_property_value property; 363 int ret; 364 365 if (!port->phy_enabled) { 366 ret = phy_power_on(port->phy); 367 if (ret) { 368 DRM_DEV_ERROR(dp->dev, "phy power on failed: %d\n", 369 ret); 370 goto err_phy; 371 } 372 port->phy_enabled = true; 373 } 374 375 ret = cdn_dp_grf_write(dp, GRF_SOC_CON26, 376 DPTX_HPD_SEL_MASK | DPTX_HPD_SEL); 377 if (ret) { 378 DRM_DEV_ERROR(dp->dev, "Failed to write HPD_SEL %d\n", ret); 379 goto err_power_on; 380 } 381 382 ret = cdn_dp_get_hpd_status(dp); 383 if (ret <= 0) { 384 if (!ret) 385 DRM_DEV_ERROR(dp->dev, "hpd does not exist\n"); 386 goto err_power_on; 387 } 388 389 ret = extcon_get_property(port->extcon, EXTCON_DISP_DP, 390 EXTCON_PROP_USB_TYPEC_POLARITY, &property); 391 if (ret) { 392 DRM_DEV_ERROR(dp->dev, "get property failed\n"); 393 goto err_power_on; 394 } 395 396 port->lanes = cdn_dp_get_port_lanes(port); 397 ret = cdn_dp_set_host_cap(dp, port->lanes, property.intval); 398 if (ret) { 399 DRM_DEV_ERROR(dp->dev, "set host capabilities failed: %d\n", 400 ret); 401 goto err_power_on; 402 } 403 404 dp->active_port = port->id; 405 return 0; 406 407 err_power_on: 408 if (phy_power_off(port->phy)) 409 DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret); 410 else 411 port->phy_enabled = false; 412 413 err_phy: 414 cdn_dp_grf_write(dp, GRF_SOC_CON26, 415 DPTX_HPD_SEL_MASK | DPTX_HPD_DEL); 416 return ret; 417 } 418 419 static int cdn_dp_disable_phy(struct cdn_dp_device *dp, 420 struct cdn_dp_port *port) 421 { 422 int ret; 423 424 if (port->phy_enabled) { 425 ret = phy_power_off(port->phy); 426 if (ret) { 427 DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret); 428 return ret; 429 } 430 } 431 432 port->phy_enabled = false; 433 port->lanes = 0; 434 dp->active_port = -1; 435 return 0; 436 } 437 438 static int cdn_dp_disable(struct cdn_dp_device *dp) 439 { 440 int ret, i; 441 442 if (!dp->active) 443 return 0; 444 445 for (i = 0; i < dp->ports; i++) 446 cdn_dp_disable_phy(dp, dp->port[i]); 447 448 ret = cdn_dp_grf_write(dp, GRF_SOC_CON26, 449 DPTX_HPD_SEL_MASK | DPTX_HPD_DEL); 450 if (ret) { 451 DRM_DEV_ERROR(dp->dev, "Failed to clear hpd sel %d\n", 452 ret); 453 return ret; 454 } 455 456 cdn_dp_set_firmware_active(dp, false); 457 cdn_dp_clk_disable(dp); 458 dp->active = false; 459 dp->max_lanes = 0; 460 dp->max_rate = 0; 461 462 return 0; 463 } 464 465 static int cdn_dp_enable(struct cdn_dp_device *dp) 466 { 467 int ret, i, lanes; 468 struct cdn_dp_port *port; 469 470 port = cdn_dp_connected_port(dp); 471 if (!port) { 472 DRM_DEV_ERROR(dp->dev, 473 "Can't enable without connection\n"); 474 return -ENODEV; 475 } 476 477 if (dp->active) 478 return 0; 479 480 ret = cdn_dp_clk_enable(dp); 481 if (ret) 482 return ret; 483 484 ret = cdn_dp_firmware_init(dp); 485 if (ret) { 486 DRM_DEV_ERROR(dp->dev, "firmware init failed: %d", ret); 487 goto err_clk_disable; 488 } 489 490 /* only enable the port that connected with downstream device */ 491 for (i = port->id; i < dp->ports; i++) { 492 port = dp->port[i]; 493 lanes = cdn_dp_get_port_lanes(port); 494 if (lanes) { 495 ret = cdn_dp_enable_phy(dp, port); 496 if (ret) 497 continue; 498 499 ret = cdn_dp_get_sink_capability(dp); 500 if (ret) { 501 cdn_dp_disable_phy(dp, port); 502 } else { 503 dp->active = true; 504 dp->lanes = port->lanes; 505 return 0; 506 } 507 } 508 } 509 510 err_clk_disable: 511 cdn_dp_clk_disable(dp); 512 return ret; 513 } 514 515 static void cdn_dp_bridge_mode_set(struct drm_bridge *bridge, 516 const struct drm_display_mode *mode, 517 const struct drm_display_mode *adjusted) 518 { 519 struct cdn_dp_device *dp = bridge_to_dp(bridge); 520 struct video_info *video = &dp->video_info; 521 522 video->color_fmt = PXL_RGB; 523 video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC); 524 video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC); 525 526 drm_mode_copy(&dp->mode, adjusted); 527 } 528 529 static bool cdn_dp_check_link_status(struct cdn_dp_device *dp) 530 { 531 u8 link_status[DP_LINK_STATUS_SIZE]; 532 struct cdn_dp_port *port = cdn_dp_connected_port(dp); 533 u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd); 534 535 if (!port || !dp->max_rate || !dp->max_lanes) 536 return false; 537 538 if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status, 539 DP_LINK_STATUS_SIZE)) { 540 DRM_ERROR("Failed to get link status\n"); 541 return false; 542 } 543 544 /* if link training is requested we should perform it always */ 545 return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes)); 546 } 547 548 static void cdn_dp_display_info_update(struct cdn_dp_device *dp, 549 struct drm_display_info *display_info) 550 { 551 struct video_info *video = &dp->video_info; 552 553 switch (display_info->bpc) { 554 case 10: 555 video->color_depth = 10; 556 break; 557 case 6: 558 video->color_depth = 6; 559 break; 560 default: 561 video->color_depth = 8; 562 break; 563 } 564 } 565 566 static void cdn_dp_bridge_atomic_enable(struct drm_bridge *bridge, struct drm_atomic_state *state) 567 { 568 struct cdn_dp_device *dp = bridge_to_dp(bridge); 569 struct drm_connector *connector; 570 int ret, val; 571 572 connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder); 573 if (!connector) 574 return; 575 576 cdn_dp_display_info_update(dp, &connector->display_info); 577 578 ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, &dp->encoder.encoder); 579 if (ret < 0) { 580 DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret); 581 return; 582 } 583 584 DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n", 585 (ret) ? "LIT" : "BIG"); 586 if (ret) 587 val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16); 588 else 589 val = DP_SEL_VOP_LIT << 16; 590 591 ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val); 592 if (ret) 593 return; 594 595 mutex_lock(&dp->lock); 596 597 ret = cdn_dp_enable(dp); 598 if (ret) { 599 DRM_DEV_ERROR(dp->dev, "Failed to enable bridge %d\n", 600 ret); 601 goto out; 602 } 603 if (!cdn_dp_check_link_status(dp)) { 604 ret = cdn_dp_train_link(dp); 605 if (ret) { 606 DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret); 607 goto out; 608 } 609 } 610 611 ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE); 612 if (ret) { 613 DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret); 614 goto out; 615 } 616 617 ret = cdn_dp_config_video(dp); 618 if (ret) { 619 DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret); 620 goto out; 621 } 622 623 ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID); 624 if (ret) { 625 DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret); 626 goto out; 627 } 628 629 out: 630 mutex_unlock(&dp->lock); 631 } 632 633 static void cdn_dp_bridge_atomic_disable(struct drm_bridge *bridge, struct drm_atomic_state *state) 634 { 635 struct cdn_dp_device *dp = bridge_to_dp(bridge); 636 int ret; 637 638 mutex_lock(&dp->lock); 639 640 if (dp->active) { 641 ret = cdn_dp_disable(dp); 642 if (ret) { 643 DRM_DEV_ERROR(dp->dev, "Failed to disable bridge %d\n", 644 ret); 645 } 646 } 647 mutex_unlock(&dp->lock); 648 649 /* 650 * In the following 2 cases, we need to run the event_work to re-enable 651 * the DP: 652 * 1. If there is not just one port device is connected, and remove one 653 * device from a port, the DP will be disabled here, at this case, 654 * run the event_work to re-open DP for the other port. 655 * 2. If re-training or re-config failed, the DP will be disabled here. 656 * run the event_work to re-connect it. 657 */ 658 if (!dp->connected && cdn_dp_connected_port(dp)) 659 schedule_work(&dp->event_work); 660 } 661 662 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder, 663 struct drm_crtc_state *crtc_state, 664 struct drm_connector_state *conn_state) 665 { 666 struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state); 667 668 s->output_mode = ROCKCHIP_OUT_MODE_AAAA; 669 s->output_type = DRM_MODE_CONNECTOR_DisplayPort; 670 671 return 0; 672 } 673 674 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = { 675 .atomic_check = cdn_dp_encoder_atomic_check, 676 }; 677 678 static int cdn_dp_parse_dt(struct cdn_dp_device *dp) 679 { 680 struct device *dev = dp->dev; 681 struct device_node *np = dev->of_node; 682 struct platform_device *pdev = to_platform_device(dev); 683 684 dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf"); 685 if (IS_ERR(dp->grf)) { 686 DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n"); 687 return PTR_ERR(dp->grf); 688 } 689 690 dp->regs = devm_platform_ioremap_resource(pdev, 0); 691 if (IS_ERR(dp->regs)) { 692 DRM_DEV_ERROR(dev, "ioremap reg failed\n"); 693 return PTR_ERR(dp->regs); 694 } 695 696 dp->core_clk = devm_clk_get(dev, "core-clk"); 697 if (IS_ERR(dp->core_clk)) { 698 DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n"); 699 return PTR_ERR(dp->core_clk); 700 } 701 702 dp->pclk = devm_clk_get(dev, "pclk"); 703 if (IS_ERR(dp->pclk)) { 704 DRM_DEV_ERROR(dev, "cannot get pclk\n"); 705 return PTR_ERR(dp->pclk); 706 } 707 708 dp->spdif_clk = devm_clk_get(dev, "spdif"); 709 if (IS_ERR(dp->spdif_clk)) { 710 DRM_DEV_ERROR(dev, "cannot get spdif_clk\n"); 711 return PTR_ERR(dp->spdif_clk); 712 } 713 714 dp->grf_clk = devm_clk_get(dev, "grf"); 715 if (IS_ERR(dp->grf_clk)) { 716 DRM_DEV_ERROR(dev, "cannot get grf clk\n"); 717 return PTR_ERR(dp->grf_clk); 718 } 719 720 dp->spdif_rst = devm_reset_control_get(dev, "spdif"); 721 if (IS_ERR(dp->spdif_rst)) { 722 DRM_DEV_ERROR(dev, "no spdif reset control found\n"); 723 return PTR_ERR(dp->spdif_rst); 724 } 725 726 dp->dptx_rst = devm_reset_control_get(dev, "dptx"); 727 if (IS_ERR(dp->dptx_rst)) { 728 DRM_DEV_ERROR(dev, "no uphy reset control found\n"); 729 return PTR_ERR(dp->dptx_rst); 730 } 731 732 dp->core_rst = devm_reset_control_get(dev, "core"); 733 if (IS_ERR(dp->core_rst)) { 734 DRM_DEV_ERROR(dev, "no core reset control found\n"); 735 return PTR_ERR(dp->core_rst); 736 } 737 738 dp->apb_rst = devm_reset_control_get(dev, "apb"); 739 if (IS_ERR(dp->apb_rst)) { 740 DRM_DEV_ERROR(dev, "no apb reset control found\n"); 741 return PTR_ERR(dp->apb_rst); 742 } 743 744 return 0; 745 } 746 747 static int cdn_dp_audio_prepare(struct drm_bridge *bridge, 748 struct drm_connector *connector, 749 struct hdmi_codec_daifmt *daifmt, 750 struct hdmi_codec_params *params) 751 { 752 struct cdn_dp_device *dp = bridge_to_dp(bridge); 753 struct audio_info audio = { 754 .sample_width = params->sample_width, 755 .sample_rate = params->sample_rate, 756 .channels = params->channels, 757 }; 758 int ret; 759 760 mutex_lock(&dp->lock); 761 if (!dp->active) { 762 ret = -ENODEV; 763 goto out; 764 } 765 766 switch (daifmt->fmt) { 767 case HDMI_I2S: 768 audio.format = AFMT_I2S; 769 break; 770 case HDMI_SPDIF: 771 audio.format = AFMT_SPDIF; 772 break; 773 default: 774 drm_err(bridge->dev, "Invalid format %d\n", daifmt->fmt); 775 ret = -EINVAL; 776 goto out; 777 } 778 779 ret = cdn_dp_audio_config(dp, &audio); 780 if (!ret) 781 dp->audio_info = audio; 782 783 out: 784 mutex_unlock(&dp->lock); 785 return ret; 786 } 787 788 static void cdn_dp_audio_shutdown(struct drm_bridge *bridge, 789 struct drm_connector *connector) 790 { 791 struct cdn_dp_device *dp = bridge_to_dp(bridge); 792 int ret; 793 794 mutex_lock(&dp->lock); 795 if (!dp->active) 796 goto out; 797 798 ret = cdn_dp_audio_stop(dp, &dp->audio_info); 799 if (!ret) 800 dp->audio_info.format = AFMT_UNUSED; 801 out: 802 mutex_unlock(&dp->lock); 803 } 804 805 static int cdn_dp_audio_mute_stream(struct drm_bridge *bridge, 806 struct drm_connector *connector, 807 bool enable, int direction) 808 { 809 struct cdn_dp_device *dp = bridge_to_dp(bridge); 810 int ret; 811 812 mutex_lock(&dp->lock); 813 if (!dp->active) { 814 ret = -ENODEV; 815 goto out; 816 } 817 818 ret = cdn_dp_audio_mute(dp, enable); 819 820 out: 821 mutex_unlock(&dp->lock); 822 return ret; 823 } 824 825 static const struct drm_bridge_funcs cdn_dp_bridge_funcs = { 826 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 827 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 828 .atomic_reset = drm_atomic_helper_bridge_reset, 829 .detect = cdn_dp_bridge_detect, 830 .edid_read = cdn_dp_bridge_edid_read, 831 .atomic_enable = cdn_dp_bridge_atomic_enable, 832 .atomic_disable = cdn_dp_bridge_atomic_disable, 833 .mode_valid = cdn_dp_bridge_mode_valid, 834 .mode_set = cdn_dp_bridge_mode_set, 835 836 .dp_audio_prepare = cdn_dp_audio_prepare, 837 .dp_audio_mute_stream = cdn_dp_audio_mute_stream, 838 .dp_audio_shutdown = cdn_dp_audio_shutdown, 839 }; 840 841 static int cdn_dp_request_firmware(struct cdn_dp_device *dp) 842 { 843 int ret; 844 unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS); 845 unsigned long sleep = 1000; 846 847 WARN_ON(!mutex_is_locked(&dp->lock)); 848 849 if (dp->fw_loaded) 850 return 0; 851 852 /* Drop the lock before getting the firmware to avoid blocking boot */ 853 mutex_unlock(&dp->lock); 854 855 while (time_before(jiffies, timeout)) { 856 ret = request_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev); 857 if (ret == -ENOENT) { 858 msleep(sleep); 859 sleep *= 2; 860 continue; 861 } else if (ret) { 862 DRM_DEV_ERROR(dp->dev, 863 "failed to request firmware: %d\n", ret); 864 goto out; 865 } 866 867 dp->fw_loaded = true; 868 ret = 0; 869 goto out; 870 } 871 872 DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n"); 873 ret = -ETIMEDOUT; 874 out: 875 mutex_lock(&dp->lock); 876 return ret; 877 } 878 879 static void cdn_dp_pd_event_work(struct work_struct *work) 880 { 881 struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device, 882 event_work); 883 int ret; 884 885 mutex_lock(&dp->lock); 886 887 if (dp->suspended) 888 goto out; 889 890 ret = cdn_dp_request_firmware(dp); 891 if (ret) 892 goto out; 893 894 dp->connected = true; 895 896 /* Not connected, notify userspace to disable the block */ 897 if (!cdn_dp_connected_port(dp)) { 898 DRM_DEV_INFO(dp->dev, "Not connected; disabling cdn\n"); 899 dp->connected = false; 900 901 /* Connected but not enabled, enable the block */ 902 } else if (!dp->active) { 903 DRM_DEV_INFO(dp->dev, "Connected, not enabled; enabling cdn\n"); 904 ret = cdn_dp_enable(dp); 905 if (ret) { 906 DRM_DEV_ERROR(dp->dev, "Enabling dp failed: %d\n", ret); 907 dp->connected = false; 908 } 909 910 /* Enabled and connected to a dongle without a sink, notify userspace */ 911 } else if (!cdn_dp_check_sink_connection(dp)) { 912 DRM_DEV_INFO(dp->dev, "Connected without sink; assert hpd\n"); 913 dp->connected = false; 914 915 /* Enabled and connected with a sink, re-train if requested */ 916 } else if (!cdn_dp_check_link_status(dp)) { 917 unsigned int rate = dp->max_rate; 918 unsigned int lanes = dp->max_lanes; 919 struct drm_display_mode *mode = &dp->mode; 920 921 DRM_DEV_INFO(dp->dev, "Connected with sink; re-train link\n"); 922 ret = cdn_dp_train_link(dp); 923 if (ret) { 924 dp->connected = false; 925 DRM_DEV_ERROR(dp->dev, "Training link failed: %d\n", ret); 926 goto out; 927 } 928 929 /* If training result is changed, update the video config */ 930 if (mode->clock && 931 (rate != dp->max_rate || lanes != dp->max_lanes)) { 932 ret = cdn_dp_config_video(dp); 933 if (ret) { 934 dp->connected = false; 935 DRM_DEV_ERROR(dp->dev, "Failed to configure video: %d\n", ret); 936 } 937 } 938 } 939 940 out: 941 mutex_unlock(&dp->lock); 942 drm_bridge_hpd_notify(&dp->bridge, 943 dp->connected ? connector_status_connected 944 : connector_status_disconnected); 945 } 946 947 static int cdn_dp_pd_event(struct notifier_block *nb, 948 unsigned long event, void *priv) 949 { 950 struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port, 951 event_nb); 952 struct cdn_dp_device *dp = port->dp; 953 954 /* 955 * It would be nice to be able to just do the work inline right here. 956 * However, we need to make a bunch of calls that might sleep in order 957 * to turn on the block/phy, so use a worker instead. 958 */ 959 schedule_work(&dp->event_work); 960 961 return NOTIFY_DONE; 962 } 963 964 static int cdn_dp_bind(struct device *dev, struct device *master, void *data) 965 { 966 struct cdn_dp_device *dp = dev_get_drvdata(dev); 967 struct drm_encoder *encoder; 968 struct drm_connector *connector; 969 struct cdn_dp_port *port; 970 struct drm_device *drm_dev = data; 971 int ret, i; 972 973 ret = cdn_dp_parse_dt(dp); 974 if (ret < 0) 975 return ret; 976 977 dp->drm_dev = drm_dev; 978 dp->connected = false; 979 dp->active = false; 980 dp->active_port = -1; 981 dp->fw_loaded = false; 982 983 INIT_WORK(&dp->event_work, cdn_dp_pd_event_work); 984 985 encoder = &dp->encoder.encoder; 986 987 encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev, 988 dev->of_node); 989 DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs); 990 991 ret = drm_simple_encoder_init(drm_dev, encoder, 992 DRM_MODE_ENCODER_TMDS); 993 if (ret) { 994 DRM_ERROR("failed to initialize encoder with drm\n"); 995 return ret; 996 } 997 998 drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs); 999 1000 dp->bridge.ops = 1001 DRM_BRIDGE_OP_DETECT | 1002 DRM_BRIDGE_OP_EDID | 1003 DRM_BRIDGE_OP_HPD | 1004 DRM_BRIDGE_OP_DP_AUDIO; 1005 dp->bridge.of_node = dp->dev->of_node; 1006 dp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort; 1007 dp->bridge.hdmi_audio_dev = dp->dev; 1008 dp->bridge.hdmi_audio_max_i2s_playback_channels = 8; 1009 dp->bridge.hdmi_audio_spdif_playback = 1; 1010 dp->bridge.hdmi_audio_dai_port = -1; 1011 1012 ret = devm_drm_bridge_add(dev, &dp->bridge); 1013 if (ret) 1014 return ret; 1015 1016 ret = drm_bridge_attach(encoder, &dp->bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR); 1017 if (ret) 1018 return ret; 1019 1020 connector = drm_bridge_connector_init(drm_dev, encoder); 1021 if (IS_ERR(connector)) { 1022 ret = PTR_ERR(connector); 1023 dev_err(dp->dev, "failed to init bridge connector: %d\n", ret); 1024 return ret; 1025 } 1026 1027 drm_connector_attach_encoder(connector, encoder); 1028 1029 for (i = 0; i < dp->ports; i++) { 1030 port = dp->port[i]; 1031 1032 port->event_nb.notifier_call = cdn_dp_pd_event; 1033 ret = devm_extcon_register_notifier(dp->dev, port->extcon, 1034 EXTCON_DISP_DP, 1035 &port->event_nb); 1036 if (ret) { 1037 DRM_DEV_ERROR(dev, 1038 "register EXTCON_DISP_DP notifier err\n"); 1039 return ret; 1040 } 1041 } 1042 1043 pm_runtime_enable(dev); 1044 1045 schedule_work(&dp->event_work); 1046 1047 return 0; 1048 } 1049 1050 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data) 1051 { 1052 struct cdn_dp_device *dp = dev_get_drvdata(dev); 1053 struct drm_encoder *encoder = &dp->encoder.encoder; 1054 1055 cancel_work_sync(&dp->event_work); 1056 encoder->funcs->destroy(encoder); 1057 1058 pm_runtime_disable(dev); 1059 if (dp->fw_loaded) 1060 release_firmware(dp->fw); 1061 } 1062 1063 static const struct component_ops cdn_dp_component_ops = { 1064 .bind = cdn_dp_bind, 1065 .unbind = cdn_dp_unbind, 1066 }; 1067 1068 static int cdn_dp_suspend(struct device *dev) 1069 { 1070 struct cdn_dp_device *dp = dev_get_drvdata(dev); 1071 int ret = 0; 1072 1073 mutex_lock(&dp->lock); 1074 if (dp->active) 1075 ret = cdn_dp_disable(dp); 1076 dp->suspended = true; 1077 mutex_unlock(&dp->lock); 1078 1079 return ret; 1080 } 1081 1082 static __maybe_unused int cdn_dp_resume(struct device *dev) 1083 { 1084 struct cdn_dp_device *dp = dev_get_drvdata(dev); 1085 1086 mutex_lock(&dp->lock); 1087 dp->suspended = false; 1088 if (dp->fw_loaded) 1089 schedule_work(&dp->event_work); 1090 mutex_unlock(&dp->lock); 1091 1092 return 0; 1093 } 1094 1095 static int cdn_dp_probe(struct platform_device *pdev) 1096 { 1097 struct device *dev = &pdev->dev; 1098 const struct of_device_id *match; 1099 struct cdn_dp_data *dp_data; 1100 struct cdn_dp_port *port; 1101 struct cdn_dp_device *dp; 1102 struct extcon_dev *extcon; 1103 struct phy *phy; 1104 int ret; 1105 int i; 1106 1107 dp = devm_drm_bridge_alloc(dev, struct cdn_dp_device, bridge, 1108 &cdn_dp_bridge_funcs); 1109 if (IS_ERR(dp)) 1110 return PTR_ERR(dp); 1111 dp->dev = dev; 1112 1113 match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node); 1114 dp_data = (struct cdn_dp_data *)match->data; 1115 1116 for (i = 0; i < dp_data->max_phy; i++) { 1117 extcon = extcon_get_edev_by_phandle(dev, i); 1118 phy = devm_of_phy_get_by_index(dev, dev->of_node, i); 1119 1120 if (PTR_ERR(extcon) == -EPROBE_DEFER || 1121 PTR_ERR(phy) == -EPROBE_DEFER) 1122 return -EPROBE_DEFER; 1123 1124 if (IS_ERR(extcon) || IS_ERR(phy)) 1125 continue; 1126 1127 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); 1128 if (!port) 1129 return -ENOMEM; 1130 1131 port->extcon = extcon; 1132 port->phy = phy; 1133 port->dp = dp; 1134 port->id = i; 1135 dp->port[dp->ports++] = port; 1136 } 1137 1138 if (!dp->ports) { 1139 DRM_DEV_ERROR(dev, "missing extcon or phy\n"); 1140 return -EINVAL; 1141 } 1142 1143 mutex_init(&dp->lock); 1144 dev_set_drvdata(dev, dp); 1145 1146 ret = component_add(dev, &cdn_dp_component_ops); 1147 if (ret) 1148 return ret; 1149 1150 return 0; 1151 } 1152 1153 static void cdn_dp_remove(struct platform_device *pdev) 1154 { 1155 struct cdn_dp_device *dp = platform_get_drvdata(pdev); 1156 1157 platform_device_unregister(dp->audio_pdev); 1158 cdn_dp_suspend(dp->dev); 1159 component_del(&pdev->dev, &cdn_dp_component_ops); 1160 } 1161 1162 static void cdn_dp_shutdown(struct platform_device *pdev) 1163 { 1164 struct cdn_dp_device *dp = platform_get_drvdata(pdev); 1165 1166 cdn_dp_suspend(dp->dev); 1167 } 1168 1169 static const struct dev_pm_ops cdn_dp_pm_ops = { 1170 SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend, 1171 cdn_dp_resume) 1172 }; 1173 1174 struct platform_driver cdn_dp_driver = { 1175 .probe = cdn_dp_probe, 1176 .remove = cdn_dp_remove, 1177 .shutdown = cdn_dp_shutdown, 1178 .driver = { 1179 .name = "cdn-dp", 1180 .of_match_table = cdn_dp_dt_ids, 1181 .pm = &cdn_dp_pm_ops, 1182 }, 1183 }; 1184