1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2018, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/device.h> 7 #include <linux/delay.h> 8 #include <linux/gpio/consumer.h> 9 #include <linux/i2c.h> 10 #include <linux/media-bus-format.h> 11 #include <linux/regmap.h> 12 13 #include <drm/drm_probe_helper.h> 14 #include <drm/drm_atomic_helper.h> 15 #include <drm/drm_edid.h> 16 #include <drm/drm_mipi_dsi.h> 17 #include <drm/drm_of.h> 18 19 #include <video/videomode.h> 20 21 #define I2C_MAIN 0 22 #define I2C_ADDR_MAIN 0x48 23 24 #define I2C_CEC_DSI 1 25 #define I2C_ADDR_CEC_DSI 0x49 26 27 #define I2C_MAX_IDX 2 28 29 struct lt8912 { 30 struct device *dev; 31 struct drm_bridge bridge; 32 struct drm_connector connector; 33 34 struct i2c_client *i2c_client[I2C_MAX_IDX]; 35 struct regmap *regmap[I2C_MAX_IDX]; 36 37 struct device_node *host_node; 38 39 struct mipi_dsi_device *dsi; 40 41 struct gpio_desc *gp_reset; 42 43 struct videomode mode; 44 45 struct regulator_bulk_data supplies[7]; 46 47 u8 data_lanes; 48 bool is_power_on; 49 }; 50 51 static int lt8912_write_init_config(struct lt8912 *lt) 52 { 53 const struct reg_sequence seq[] = { 54 /* Digital clock en*/ 55 {0x08, 0xff}, 56 {0x09, 0xff}, 57 {0x0a, 0xff}, 58 {0x0b, 0x7c}, 59 {0x0c, 0xff}, 60 {0x42, 0x04}, 61 62 /*Tx Analog*/ 63 {0x31, 0xb1}, 64 {0x32, 0xb1}, 65 {0x33, 0x0e}, 66 {0x37, 0x00}, 67 {0x38, 0x22}, 68 {0x60, 0x82}, 69 70 /*Cbus Analog*/ 71 {0x39, 0x45}, 72 {0x3a, 0x00}, 73 {0x3b, 0x00}, 74 75 /*HDMI Pll Analog*/ 76 {0x44, 0x31}, 77 {0x55, 0x44}, 78 {0x57, 0x01}, 79 {0x5a, 0x02}, 80 81 /*MIPI Analog*/ 82 {0x3e, 0xd6}, 83 {0x3f, 0xd4}, 84 {0x41, 0x3c}, 85 {0xB2, 0x00}, 86 }; 87 88 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); 89 } 90 91 static int lt8912_write_mipi_basic_config(struct lt8912 *lt) 92 { 93 const struct reg_sequence seq[] = { 94 {0x12, 0x04}, 95 {0x14, 0x00}, 96 {0x15, 0x00}, 97 {0x1a, 0x03}, 98 {0x1b, 0x03}, 99 }; 100 101 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); 102 }; 103 104 static int lt8912_write_dds_config(struct lt8912 *lt) 105 { 106 const struct reg_sequence seq[] = { 107 {0x4e, 0xff}, 108 {0x4f, 0x56}, 109 {0x50, 0x69}, 110 {0x51, 0x80}, 111 {0x1f, 0x5e}, 112 {0x20, 0x01}, 113 {0x21, 0x2c}, 114 {0x22, 0x01}, 115 {0x23, 0xfa}, 116 {0x24, 0x00}, 117 {0x25, 0xc8}, 118 {0x26, 0x00}, 119 {0x27, 0x5e}, 120 {0x28, 0x01}, 121 {0x29, 0x2c}, 122 {0x2a, 0x01}, 123 {0x2b, 0xfa}, 124 {0x2c, 0x00}, 125 {0x2d, 0xc8}, 126 {0x2e, 0x00}, 127 {0x42, 0x64}, 128 {0x43, 0x00}, 129 {0x44, 0x04}, 130 {0x45, 0x00}, 131 {0x46, 0x59}, 132 {0x47, 0x00}, 133 {0x48, 0xf2}, 134 {0x49, 0x06}, 135 {0x4a, 0x00}, 136 {0x4b, 0x72}, 137 {0x4c, 0x45}, 138 {0x4d, 0x00}, 139 {0x52, 0x08}, 140 {0x53, 0x00}, 141 {0x54, 0xb2}, 142 {0x55, 0x00}, 143 {0x56, 0xe4}, 144 {0x57, 0x0d}, 145 {0x58, 0x00}, 146 {0x59, 0xe4}, 147 {0x5a, 0x8a}, 148 {0x5b, 0x00}, 149 {0x5c, 0x34}, 150 {0x1e, 0x4f}, 151 {0x51, 0x00}, 152 }; 153 154 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); 155 } 156 157 static int lt8912_write_rxlogicres_config(struct lt8912 *lt) 158 { 159 int ret; 160 161 ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f); 162 usleep_range(10000, 20000); 163 ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff); 164 165 return ret; 166 }; 167 168 /* enable LVDS output with some hardcoded configuration, not required for the HDMI output */ 169 static int lt8912_write_lvds_config(struct lt8912 *lt) 170 { 171 const struct reg_sequence seq[] = { 172 // lvds power up 173 {0x44, 0x30}, 174 {0x51, 0x05}, 175 176 // core pll bypass 177 {0x50, 0x24}, // cp=50uA 178 {0x51, 0x2d}, // Pix_clk as reference, second order passive LPF PLL 179 {0x52, 0x04}, // loopdiv=0, use second-order PLL 180 {0x69, 0x0e}, // CP_PRESET_DIV_RATIO 181 {0x69, 0x8e}, 182 {0x6a, 0x00}, 183 {0x6c, 0xb8}, // RGD_CP_SOFT_K_EN,RGD_CP_SOFT_K[13:8] 184 {0x6b, 0x51}, 185 186 {0x04, 0xfb}, // core pll reset 187 {0x04, 0xff}, 188 189 // scaler bypass 190 {0x7f, 0x00}, // disable scaler 191 {0xa8, 0x13}, // 0x13: JEIDA, 0x33: VESA 192 193 {0x02, 0xf7}, // lvds pll reset 194 {0x02, 0xff}, 195 {0x03, 0xcf}, 196 {0x03, 0xff}, 197 }; 198 199 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); 200 }; 201 202 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) 203 { 204 return container_of(b, struct lt8912, bridge); 205 } 206 207 static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c) 208 { 209 return container_of(c, struct lt8912, connector); 210 } 211 212 static const struct regmap_config lt8912_regmap_config = { 213 .reg_bits = 8, 214 .val_bits = 8, 215 .max_register = 0xff, 216 }; 217 218 static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client) 219 { 220 unsigned int i; 221 /* 222 * At this time we only initialize 2 chips, but the lt8912 provides 223 * a third interface for the audio over HDMI configuration. 224 */ 225 struct i2c_board_info info[] = { 226 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), }, 227 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), }, 228 }; 229 230 if (!lt) 231 return -ENODEV; 232 233 for (i = 0; i < ARRAY_SIZE(info); i++) { 234 if (i > 0) { 235 lt->i2c_client[i] = i2c_new_dummy_device(client->adapter, 236 info[i].addr); 237 if (IS_ERR(lt->i2c_client[i])) 238 return PTR_ERR(lt->i2c_client[i]); 239 } 240 241 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i], 242 <8912_regmap_config); 243 if (IS_ERR(lt->regmap[i])) 244 return PTR_ERR(lt->regmap[i]); 245 } 246 return 0; 247 } 248 249 static int lt8912_free_i2c(struct lt8912 *lt) 250 { 251 unsigned int i; 252 253 for (i = 1; i < I2C_MAX_IDX; i++) 254 i2c_unregister_device(lt->i2c_client[i]); 255 256 return 0; 257 } 258 259 static int lt8912_hard_power_on(struct lt8912 *lt) 260 { 261 int ret; 262 263 ret = regulator_bulk_enable(ARRAY_SIZE(lt->supplies), lt->supplies); 264 if (ret) 265 return ret; 266 267 gpiod_set_value_cansleep(lt->gp_reset, 0); 268 msleep(20); 269 270 return 0; 271 } 272 273 static void lt8912_hard_power_off(struct lt8912 *lt) 274 { 275 gpiod_set_value_cansleep(lt->gp_reset, 1); 276 msleep(20); 277 278 regulator_bulk_disable(ARRAY_SIZE(lt->supplies), lt->supplies); 279 280 lt->is_power_on = false; 281 } 282 283 static int lt8912_video_setup(struct lt8912 *lt) 284 { 285 u32 hactive, h_total, hpw, hfp, hbp; 286 u32 vactive, v_total, vpw, vfp, vbp; 287 u8 settle = 0x08; 288 int ret, hsync_activehigh, vsync_activehigh; 289 290 if (!lt) 291 return -EINVAL; 292 293 hactive = lt->mode.hactive; 294 hfp = lt->mode.hfront_porch; 295 hpw = lt->mode.hsync_len; 296 hbp = lt->mode.hback_porch; 297 h_total = hactive + hfp + hpw + hbp; 298 hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH; 299 300 vactive = lt->mode.vactive; 301 vfp = lt->mode.vfront_porch; 302 vpw = lt->mode.vsync_len; 303 vbp = lt->mode.vback_porch; 304 v_total = vactive + vfp + vpw + vbp; 305 vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH; 306 307 if (vactive <= 600) 308 settle = 0x04; 309 else if (vactive == 1080) 310 settle = 0x0a; 311 312 ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01); 313 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle); 314 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw); 315 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw); 316 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff); 317 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8); 318 319 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c); 320 321 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff); 322 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8); 323 324 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff); 325 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8); 326 327 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff); 328 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8); 329 330 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff); 331 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8); 332 333 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff); 334 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8); 335 336 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff); 337 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8); 338 339 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0), 340 vsync_activehigh ? BIT(0) : 0); 341 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1), 342 hsync_activehigh ? BIT(1) : 0); 343 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0), 344 lt->connector.display_info.is_hdmi ? BIT(0) : 0); 345 346 return ret; 347 } 348 349 static int lt8912_soft_power_on(struct lt8912 *lt) 350 { 351 if (!lt->is_power_on) { 352 u32 lanes = lt->data_lanes; 353 354 lt8912_write_init_config(lt); 355 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); 356 357 lt8912_write_mipi_basic_config(lt); 358 359 lt->is_power_on = true; 360 } 361 362 return 0; 363 } 364 365 static int lt8912_video_on(struct lt8912 *lt) 366 { 367 int ret; 368 369 ret = lt8912_video_setup(lt); 370 if (ret < 0) 371 goto end; 372 373 ret = lt8912_write_dds_config(lt); 374 if (ret < 0) 375 goto end; 376 377 ret = lt8912_write_rxlogicres_config(lt); 378 if (ret < 0) 379 goto end; 380 381 ret = lt8912_write_lvds_config(lt); 382 if (ret < 0) 383 goto end; 384 385 end: 386 return ret; 387 } 388 389 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) 390 { 391 int ret; 392 unsigned int reg_val; 393 394 ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); 395 if (ret) 396 return connector_status_unknown; 397 398 if (reg_val & BIT(7)) 399 return connector_status_connected; 400 401 return connector_status_disconnected; 402 } 403 404 static enum drm_connector_status 405 lt8912_connector_detect(struct drm_connector *connector, bool force) 406 { 407 struct lt8912 *lt = connector_to_lt8912(connector); 408 409 if (lt->bridge.next_bridge->ops & DRM_BRIDGE_OP_DETECT) 410 return drm_bridge_detect(lt->bridge.next_bridge, connector); 411 412 return lt8912_check_cable_status(lt); 413 } 414 415 static const struct drm_connector_funcs lt8912_connector_funcs = { 416 .detect = lt8912_connector_detect, 417 .fill_modes = drm_helper_probe_single_connector_modes, 418 .destroy = drm_connector_cleanup, 419 .reset = drm_atomic_helper_connector_reset, 420 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 421 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 422 }; 423 424 static int lt8912_connector_get_modes(struct drm_connector *connector) 425 { 426 const struct drm_edid *drm_edid; 427 struct lt8912 *lt = connector_to_lt8912(connector); 428 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 429 int ret, num; 430 431 drm_edid = drm_bridge_edid_read(lt->bridge.next_bridge, connector); 432 drm_edid_connector_update(connector, drm_edid); 433 if (!drm_edid) 434 return 0; 435 436 num = drm_edid_connector_add_modes(connector); 437 438 ret = drm_display_info_set_bus_formats(&connector->display_info, 439 &bus_format, 1); 440 if (ret < 0) 441 num = 0; 442 443 drm_edid_free(drm_edid); 444 return num; 445 } 446 447 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { 448 .get_modes = lt8912_connector_get_modes, 449 }; 450 451 static void lt8912_bridge_mode_set(struct drm_bridge *bridge, 452 const struct drm_display_mode *mode, 453 const struct drm_display_mode *adj) 454 { 455 struct lt8912 *lt = bridge_to_lt8912(bridge); 456 457 drm_display_mode_to_videomode(adj, <->mode); 458 } 459 460 static void lt8912_bridge_enable(struct drm_bridge *bridge) 461 { 462 struct lt8912 *lt = bridge_to_lt8912(bridge); 463 464 lt8912_video_on(lt); 465 } 466 467 static int lt8912_attach_dsi(struct lt8912 *lt) 468 { 469 struct device *dev = lt->dev; 470 struct mipi_dsi_host *host; 471 struct mipi_dsi_device *dsi; 472 int ret = -1; 473 const struct mipi_dsi_device_info info = { .type = "lt8912", 474 .channel = 0, 475 .node = NULL, 476 }; 477 478 host = of_find_mipi_dsi_host_by_node(lt->host_node); 479 if (!host) 480 return dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n"); 481 482 dsi = devm_mipi_dsi_device_register_full(dev, host, &info); 483 if (IS_ERR(dsi)) { 484 ret = PTR_ERR(dsi); 485 dev_err(dev, "failed to create dsi device (%d)\n", ret); 486 return ret; 487 } 488 489 lt->dsi = dsi; 490 491 dsi->lanes = lt->data_lanes; 492 dsi->format = MIPI_DSI_FMT_RGB888; 493 494 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 495 MIPI_DSI_MODE_LPM | 496 MIPI_DSI_MODE_VIDEO_NO_HFP | 497 MIPI_DSI_MODE_NO_EOT_PACKET; 498 499 ret = devm_mipi_dsi_attach(dev, dsi); 500 if (ret < 0) { 501 dev_err(dev, "failed to attach dsi to host\n"); 502 return ret; 503 } 504 505 return 0; 506 } 507 508 static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status) 509 { 510 struct lt8912 *lt = data; 511 512 if (lt->bridge.dev) 513 drm_helper_hpd_irq_event(lt->bridge.dev); 514 } 515 516 static int lt8912_bridge_connector_init(struct drm_bridge *bridge) 517 { 518 int ret; 519 struct lt8912 *lt = bridge_to_lt8912(bridge); 520 struct drm_connector *connector = <->connector; 521 522 if (lt->bridge.next_bridge->ops & DRM_BRIDGE_OP_HPD) { 523 drm_bridge_hpd_enable(lt->bridge.next_bridge, lt8912_bridge_hpd_cb, lt); 524 connector->polled = DRM_CONNECTOR_POLL_HPD; 525 } else { 526 connector->polled = DRM_CONNECTOR_POLL_CONNECT | 527 DRM_CONNECTOR_POLL_DISCONNECT; 528 } 529 530 ret = drm_connector_init(bridge->dev, connector, 531 <8912_connector_funcs, 532 lt->bridge.next_bridge->type); 533 if (ret) 534 goto exit; 535 536 drm_connector_helper_add(connector, <8912_connector_helper_funcs); 537 538 connector->dpms = DRM_MODE_DPMS_OFF; 539 drm_connector_attach_encoder(connector, bridge->encoder); 540 541 exit: 542 return ret; 543 } 544 545 static int lt8912_bridge_attach(struct drm_bridge *bridge, 546 struct drm_encoder *encoder, 547 enum drm_bridge_attach_flags flags) 548 { 549 struct lt8912 *lt = bridge_to_lt8912(bridge); 550 int ret; 551 552 ret = drm_bridge_attach(encoder, lt->bridge.next_bridge, bridge, 553 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 554 if (ret < 0) { 555 dev_err(lt->dev, "Failed to attach next bridge (%d)\n", ret); 556 return ret; 557 } 558 559 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 560 ret = lt8912_bridge_connector_init(bridge); 561 if (ret) { 562 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); 563 return ret; 564 } 565 } 566 567 ret = lt8912_hard_power_on(lt); 568 if (ret) 569 return ret; 570 571 ret = lt8912_soft_power_on(lt); 572 if (ret) 573 goto error; 574 575 return 0; 576 577 error: 578 lt8912_hard_power_off(lt); 579 return ret; 580 } 581 582 static void lt8912_bridge_detach(struct drm_bridge *bridge) 583 { 584 struct lt8912 *lt = bridge_to_lt8912(bridge); 585 586 lt8912_hard_power_off(lt); 587 588 if (lt->connector.dev && lt->bridge.next_bridge->ops & DRM_BRIDGE_OP_HPD) 589 drm_bridge_hpd_disable(lt->bridge.next_bridge); 590 } 591 592 static enum drm_mode_status 593 lt8912_bridge_mode_valid(struct drm_bridge *bridge, 594 const struct drm_display_info *info, 595 const struct drm_display_mode *mode) 596 { 597 if (mode->clock > 150000) 598 return MODE_CLOCK_HIGH; 599 600 if (mode->hdisplay > 1920) 601 return MODE_BAD_HVALUE; 602 603 if (mode->vdisplay > 1080) 604 return MODE_BAD_VVALUE; 605 606 return MODE_OK; 607 } 608 609 static enum drm_connector_status 610 lt8912_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector) 611 { 612 struct lt8912 *lt = bridge_to_lt8912(bridge); 613 614 if (lt->bridge.next_bridge->ops & DRM_BRIDGE_OP_DETECT) 615 return drm_bridge_detect(lt->bridge.next_bridge, connector); 616 617 return lt8912_check_cable_status(lt); 618 } 619 620 static const struct drm_edid *lt8912_bridge_edid_read(struct drm_bridge *bridge, 621 struct drm_connector *connector) 622 { 623 struct lt8912 *lt = bridge_to_lt8912(bridge); 624 625 /* 626 * edid must be read through the ddc bus but it must be 627 * given to the hdmi connector node. 628 */ 629 if (lt->bridge.next_bridge->ops & DRM_BRIDGE_OP_EDID) 630 return drm_bridge_edid_read(lt->bridge.next_bridge, connector); 631 632 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); 633 return NULL; 634 } 635 636 static const struct drm_bridge_funcs lt8912_bridge_funcs = { 637 .attach = lt8912_bridge_attach, 638 .detach = lt8912_bridge_detach, 639 .mode_valid = lt8912_bridge_mode_valid, 640 .mode_set = lt8912_bridge_mode_set, 641 .enable = lt8912_bridge_enable, 642 .detect = lt8912_bridge_detect, 643 .edid_read = lt8912_bridge_edid_read, 644 }; 645 646 static int lt8912_bridge_resume(struct device *dev) 647 { 648 struct lt8912 *lt = dev_get_drvdata(dev); 649 int ret; 650 651 ret = lt8912_hard_power_on(lt); 652 if (ret) 653 return ret; 654 655 ret = lt8912_soft_power_on(lt); 656 if (ret) 657 return ret; 658 659 return lt8912_video_on(lt); 660 } 661 662 static int lt8912_bridge_suspend(struct device *dev) 663 { 664 struct lt8912 *lt = dev_get_drvdata(dev); 665 666 lt8912_hard_power_off(lt); 667 668 return 0; 669 } 670 671 static DEFINE_SIMPLE_DEV_PM_OPS(lt8912_bridge_pm_ops, lt8912_bridge_suspend, lt8912_bridge_resume); 672 673 static int lt8912_get_regulators(struct lt8912 *lt) 674 { 675 unsigned int i; 676 const char * const supply_names[] = { 677 "vdd", "vccmipirx", "vccsysclk", "vcclvdstx", 678 "vcchdmitx", "vcclvdspll", "vcchdmipll" 679 }; 680 681 for (i = 0; i < ARRAY_SIZE(lt->supplies); i++) 682 lt->supplies[i].supply = supply_names[i]; 683 684 return devm_regulator_bulk_get(lt->dev, ARRAY_SIZE(lt->supplies), 685 lt->supplies); 686 } 687 688 static int lt8912_parse_dt(struct lt8912 *lt) 689 { 690 struct gpio_desc *gp_reset; 691 struct device *dev = lt->dev; 692 int ret; 693 int data_lanes; 694 struct device_node *port_node; 695 696 gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 697 if (IS_ERR(gp_reset)) { 698 ret = PTR_ERR(gp_reset); 699 if (ret != -EPROBE_DEFER) 700 dev_err(dev, "Failed to get reset gpio: %d\n", ret); 701 return ret; 702 } 703 lt->gp_reset = gp_reset; 704 705 data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4); 706 if (data_lanes < 0) { 707 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__); 708 return data_lanes; 709 } 710 711 lt->data_lanes = data_lanes; 712 713 lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1); 714 if (!lt->host_node) { 715 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__); 716 return -ENODEV; 717 } 718 719 port_node = of_graph_get_remote_node(dev->of_node, 1, -1); 720 if (!port_node) { 721 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__); 722 ret = -ENODEV; 723 goto err_free_host_node; 724 } 725 726 lt->bridge.next_bridge = of_drm_find_and_get_bridge(port_node); 727 if (!lt->bridge.next_bridge) { 728 ret = -EPROBE_DEFER; 729 dev_err_probe(lt->dev, ret, "%s: Failed to get hdmi port\n", __func__); 730 goto err_free_host_node; 731 } 732 733 if (!of_device_is_compatible(port_node, "hdmi-connector")) { 734 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); 735 ret = -EINVAL; 736 goto err_free_host_node; 737 } 738 739 ret = lt8912_get_regulators(lt); 740 if (ret) 741 goto err_free_host_node; 742 743 of_node_put(port_node); 744 return 0; 745 746 err_free_host_node: 747 of_node_put(port_node); 748 of_node_put(lt->host_node); 749 return ret; 750 } 751 752 static int lt8912_put_dt(struct lt8912 *lt) 753 { 754 of_node_put(lt->host_node); 755 return 0; 756 } 757 758 static int lt8912_probe(struct i2c_client *client) 759 { 760 static struct lt8912 *lt; 761 int ret = 0; 762 struct device *dev = &client->dev; 763 764 lt = devm_drm_bridge_alloc(dev, struct lt8912, bridge, 765 <8912_bridge_funcs); 766 if (IS_ERR(lt)) 767 return PTR_ERR(lt); 768 769 lt->dev = dev; 770 lt->i2c_client[0] = client; 771 772 ret = lt8912_parse_dt(lt); 773 if (ret) 774 goto err_dt_parse; 775 776 ret = lt8912_init_i2c(lt, client); 777 if (ret) 778 goto err_i2c; 779 780 i2c_set_clientdata(client, lt); 781 782 lt->bridge.of_node = dev->of_node; 783 lt->bridge.ops = (DRM_BRIDGE_OP_EDID | 784 DRM_BRIDGE_OP_DETECT); 785 786 drm_bridge_add(<->bridge); 787 788 ret = lt8912_attach_dsi(lt); 789 if (ret) 790 goto err_attach; 791 792 return 0; 793 794 err_attach: 795 drm_bridge_remove(<->bridge); 796 lt8912_free_i2c(lt); 797 err_i2c: 798 lt8912_put_dt(lt); 799 err_dt_parse: 800 return ret; 801 } 802 803 static void lt8912_remove(struct i2c_client *client) 804 { 805 struct lt8912 *lt = i2c_get_clientdata(client); 806 807 drm_bridge_remove(<->bridge); 808 lt8912_free_i2c(lt); 809 lt8912_put_dt(lt); 810 } 811 812 static const struct of_device_id lt8912_dt_match[] = { 813 {.compatible = "lontium,lt8912b"}, 814 {} 815 }; 816 MODULE_DEVICE_TABLE(of, lt8912_dt_match); 817 818 static const struct i2c_device_id lt8912_id[] = { 819 { "lt8912" }, 820 {} 821 }; 822 MODULE_DEVICE_TABLE(i2c, lt8912_id); 823 824 static struct i2c_driver lt8912_i2c_driver = { 825 .driver = { 826 .name = "lt8912", 827 .of_match_table = lt8912_dt_match, 828 .pm = pm_sleep_ptr(<8912_bridge_pm_ops), 829 }, 830 .probe = lt8912_probe, 831 .remove = lt8912_remove, 832 .id_table = lt8912_id, 833 }; 834 module_i2c_driver(lt8912_i2c_driver); 835 836 MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>"); 837 MODULE_DESCRIPTION("lt8912 drm driver"); 838 MODULE_LICENSE("GPL v2"); 839