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 struct drm_bridge *hdmi_port; 39 40 struct mipi_dsi_device *dsi; 41 42 struct gpio_desc *gp_reset; 43 44 struct videomode mode; 45 46 struct regulator_bulk_data supplies[7]; 47 48 u8 data_lanes; 49 bool is_power_on; 50 }; 51 52 static int lt8912_write_init_config(struct lt8912 *lt) 53 { 54 const struct reg_sequence seq[] = { 55 /* Digital clock en*/ 56 {0x08, 0xff}, 57 {0x09, 0xff}, 58 {0x0a, 0xff}, 59 {0x0b, 0x7c}, 60 {0x0c, 0xff}, 61 {0x42, 0x04}, 62 63 /*Tx Analog*/ 64 {0x31, 0xb1}, 65 {0x32, 0xb1}, 66 {0x33, 0x0e}, 67 {0x37, 0x00}, 68 {0x38, 0x22}, 69 {0x60, 0x82}, 70 71 /*Cbus Analog*/ 72 {0x39, 0x45}, 73 {0x3a, 0x00}, 74 {0x3b, 0x00}, 75 76 /*HDMI Pll Analog*/ 77 {0x44, 0x31}, 78 {0x55, 0x44}, 79 {0x57, 0x01}, 80 {0x5a, 0x02}, 81 82 /*MIPI Analog*/ 83 {0x3e, 0xd6}, 84 {0x3f, 0xd4}, 85 {0x41, 0x3c}, 86 {0xB2, 0x00}, 87 }; 88 89 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); 90 } 91 92 static int lt8912_write_mipi_basic_config(struct lt8912 *lt) 93 { 94 const struct reg_sequence seq[] = { 95 {0x12, 0x04}, 96 {0x14, 0x00}, 97 {0x15, 0x00}, 98 {0x1a, 0x03}, 99 {0x1b, 0x03}, 100 }; 101 102 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); 103 }; 104 105 static int lt8912_write_dds_config(struct lt8912 *lt) 106 { 107 const struct reg_sequence seq[] = { 108 {0x4e, 0xff}, 109 {0x4f, 0x56}, 110 {0x50, 0x69}, 111 {0x51, 0x80}, 112 {0x1f, 0x5e}, 113 {0x20, 0x01}, 114 {0x21, 0x2c}, 115 {0x22, 0x01}, 116 {0x23, 0xfa}, 117 {0x24, 0x00}, 118 {0x25, 0xc8}, 119 {0x26, 0x00}, 120 {0x27, 0x5e}, 121 {0x28, 0x01}, 122 {0x29, 0x2c}, 123 {0x2a, 0x01}, 124 {0x2b, 0xfa}, 125 {0x2c, 0x00}, 126 {0x2d, 0xc8}, 127 {0x2e, 0x00}, 128 {0x42, 0x64}, 129 {0x43, 0x00}, 130 {0x44, 0x04}, 131 {0x45, 0x00}, 132 {0x46, 0x59}, 133 {0x47, 0x00}, 134 {0x48, 0xf2}, 135 {0x49, 0x06}, 136 {0x4a, 0x00}, 137 {0x4b, 0x72}, 138 {0x4c, 0x45}, 139 {0x4d, 0x00}, 140 {0x52, 0x08}, 141 {0x53, 0x00}, 142 {0x54, 0xb2}, 143 {0x55, 0x00}, 144 {0x56, 0xe4}, 145 {0x57, 0x0d}, 146 {0x58, 0x00}, 147 {0x59, 0xe4}, 148 {0x5a, 0x8a}, 149 {0x5b, 0x00}, 150 {0x5c, 0x34}, 151 {0x1e, 0x4f}, 152 {0x51, 0x00}, 153 }; 154 155 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); 156 } 157 158 static int lt8912_write_rxlogicres_config(struct lt8912 *lt) 159 { 160 int ret; 161 162 ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f); 163 usleep_range(10000, 20000); 164 ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff); 165 166 return ret; 167 }; 168 169 /* enable LVDS output with some hardcoded configuration, not required for the HDMI output */ 170 static int lt8912_write_lvds_config(struct lt8912 *lt) 171 { 172 const struct reg_sequence seq[] = { 173 // lvds power up 174 {0x44, 0x30}, 175 {0x51, 0x05}, 176 177 // core pll bypass 178 {0x50, 0x24}, // cp=50uA 179 {0x51, 0x2d}, // Pix_clk as reference, second order passive LPF PLL 180 {0x52, 0x04}, // loopdiv=0, use second-order PLL 181 {0x69, 0x0e}, // CP_PRESET_DIV_RATIO 182 {0x69, 0x8e}, 183 {0x6a, 0x00}, 184 {0x6c, 0xb8}, // RGD_CP_SOFT_K_EN,RGD_CP_SOFT_K[13:8] 185 {0x6b, 0x51}, 186 187 {0x04, 0xfb}, // core pll reset 188 {0x04, 0xff}, 189 190 // scaler bypass 191 {0x7f, 0x00}, // disable scaler 192 {0xa8, 0x13}, // 0x13: JEIDA, 0x33: VESA 193 194 {0x02, 0xf7}, // lvds pll reset 195 {0x02, 0xff}, 196 {0x03, 0xcf}, 197 {0x03, 0xff}, 198 }; 199 200 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); 201 }; 202 203 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) 204 { 205 return container_of(b, struct lt8912, bridge); 206 } 207 208 static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c) 209 { 210 return container_of(c, struct lt8912, connector); 211 } 212 213 static const struct regmap_config lt8912_regmap_config = { 214 .reg_bits = 8, 215 .val_bits = 8, 216 .max_register = 0xff, 217 }; 218 219 static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client) 220 { 221 unsigned int i; 222 /* 223 * At this time we only initialize 2 chips, but the lt8912 provides 224 * a third interface for the audio over HDMI configuration. 225 */ 226 struct i2c_board_info info[] = { 227 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), }, 228 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), }, 229 }; 230 231 if (!lt) 232 return -ENODEV; 233 234 for (i = 0; i < ARRAY_SIZE(info); i++) { 235 if (i > 0) { 236 lt->i2c_client[i] = i2c_new_dummy_device(client->adapter, 237 info[i].addr); 238 if (IS_ERR(lt->i2c_client[i])) 239 return PTR_ERR(lt->i2c_client[i]); 240 } 241 242 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i], 243 <8912_regmap_config); 244 if (IS_ERR(lt->regmap[i])) 245 return PTR_ERR(lt->regmap[i]); 246 } 247 return 0; 248 } 249 250 static int lt8912_free_i2c(struct lt8912 *lt) 251 { 252 unsigned int i; 253 254 for (i = 1; i < I2C_MAX_IDX; i++) 255 i2c_unregister_device(lt->i2c_client[i]); 256 257 return 0; 258 } 259 260 static int lt8912_hard_power_on(struct lt8912 *lt) 261 { 262 int ret; 263 264 ret = regulator_bulk_enable(ARRAY_SIZE(lt->supplies), lt->supplies); 265 if (ret) 266 return ret; 267 268 gpiod_set_value_cansleep(lt->gp_reset, 0); 269 msleep(20); 270 271 return 0; 272 } 273 274 static void lt8912_hard_power_off(struct lt8912 *lt) 275 { 276 gpiod_set_value_cansleep(lt->gp_reset, 1); 277 msleep(20); 278 279 regulator_bulk_disable(ARRAY_SIZE(lt->supplies), lt->supplies); 280 281 lt->is_power_on = false; 282 } 283 284 static int lt8912_video_setup(struct lt8912 *lt) 285 { 286 u32 hactive, h_total, hpw, hfp, hbp; 287 u32 vactive, v_total, vpw, vfp, vbp; 288 u8 settle = 0x08; 289 int ret, hsync_activehigh, vsync_activehigh; 290 291 if (!lt) 292 return -EINVAL; 293 294 hactive = lt->mode.hactive; 295 hfp = lt->mode.hfront_porch; 296 hpw = lt->mode.hsync_len; 297 hbp = lt->mode.hback_porch; 298 h_total = hactive + hfp + hpw + hbp; 299 hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH; 300 301 vactive = lt->mode.vactive; 302 vfp = lt->mode.vfront_porch; 303 vpw = lt->mode.vsync_len; 304 vbp = lt->mode.vback_porch; 305 v_total = vactive + vfp + vpw + vbp; 306 vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH; 307 308 if (vactive <= 600) 309 settle = 0x04; 310 else if (vactive == 1080) 311 settle = 0x0a; 312 313 ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01); 314 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle); 315 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw); 316 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw); 317 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff); 318 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8); 319 320 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c); 321 322 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff); 323 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8); 324 325 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff); 326 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8); 327 328 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff); 329 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8); 330 331 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff); 332 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8); 333 334 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff); 335 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8); 336 337 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff); 338 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8); 339 340 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0), 341 vsync_activehigh ? BIT(0) : 0); 342 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1), 343 hsync_activehigh ? BIT(1) : 0); 344 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0), 345 lt->connector.display_info.is_hdmi ? BIT(0) : 0); 346 347 return ret; 348 } 349 350 static int lt8912_soft_power_on(struct lt8912 *lt) 351 { 352 if (!lt->is_power_on) { 353 u32 lanes = lt->data_lanes; 354 355 lt8912_write_init_config(lt); 356 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); 357 358 lt8912_write_mipi_basic_config(lt); 359 360 lt->is_power_on = true; 361 } 362 363 return 0; 364 } 365 366 static int lt8912_video_on(struct lt8912 *lt) 367 { 368 int ret; 369 370 ret = lt8912_video_setup(lt); 371 if (ret < 0) 372 goto end; 373 374 ret = lt8912_write_dds_config(lt); 375 if (ret < 0) 376 goto end; 377 378 ret = lt8912_write_rxlogicres_config(lt); 379 if (ret < 0) 380 goto end; 381 382 ret = lt8912_write_lvds_config(lt); 383 if (ret < 0) 384 goto end; 385 386 end: 387 return ret; 388 } 389 390 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) 391 { 392 int ret; 393 unsigned int reg_val; 394 395 ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); 396 if (ret) 397 return connector_status_unknown; 398 399 if (reg_val & BIT(7)) 400 return connector_status_connected; 401 402 return connector_status_disconnected; 403 } 404 405 static enum drm_connector_status 406 lt8912_connector_detect(struct drm_connector *connector, bool force) 407 { 408 struct lt8912 *lt = connector_to_lt8912(connector); 409 410 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 411 return drm_bridge_detect(lt->hdmi_port); 412 413 return lt8912_check_cable_status(lt); 414 } 415 416 static const struct drm_connector_funcs lt8912_connector_funcs = { 417 .detect = lt8912_connector_detect, 418 .fill_modes = drm_helper_probe_single_connector_modes, 419 .destroy = drm_connector_cleanup, 420 .reset = drm_atomic_helper_connector_reset, 421 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 422 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 423 }; 424 425 static enum drm_mode_status 426 lt8912_connector_mode_valid(struct drm_connector *connector, 427 struct drm_display_mode *mode) 428 { 429 if (mode->clock > 150000) 430 return MODE_CLOCK_HIGH; 431 432 if (mode->hdisplay > 1920) 433 return MODE_BAD_HVALUE; 434 435 if (mode->vdisplay > 1080) 436 return MODE_BAD_VVALUE; 437 438 return MODE_OK; 439 } 440 441 static int lt8912_connector_get_modes(struct drm_connector *connector) 442 { 443 const struct drm_edid *drm_edid; 444 struct lt8912 *lt = connector_to_lt8912(connector); 445 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 446 int ret, num; 447 448 drm_edid = drm_bridge_edid_read(lt->hdmi_port, connector); 449 drm_edid_connector_update(connector, drm_edid); 450 if (!drm_edid) 451 return 0; 452 453 num = drm_edid_connector_add_modes(connector); 454 455 ret = drm_display_info_set_bus_formats(&connector->display_info, 456 &bus_format, 1); 457 if (ret < 0) 458 num = 0; 459 460 drm_edid_free(drm_edid); 461 return num; 462 } 463 464 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { 465 .get_modes = lt8912_connector_get_modes, 466 .mode_valid = lt8912_connector_mode_valid, 467 }; 468 469 static void lt8912_bridge_mode_set(struct drm_bridge *bridge, 470 const struct drm_display_mode *mode, 471 const struct drm_display_mode *adj) 472 { 473 struct lt8912 *lt = bridge_to_lt8912(bridge); 474 475 drm_display_mode_to_videomode(adj, <->mode); 476 } 477 478 static void lt8912_bridge_enable(struct drm_bridge *bridge) 479 { 480 struct lt8912 *lt = bridge_to_lt8912(bridge); 481 482 lt8912_video_on(lt); 483 } 484 485 static int lt8912_attach_dsi(struct lt8912 *lt) 486 { 487 struct device *dev = lt->dev; 488 struct mipi_dsi_host *host; 489 struct mipi_dsi_device *dsi; 490 int ret = -1; 491 const struct mipi_dsi_device_info info = { .type = "lt8912", 492 .channel = 0, 493 .node = NULL, 494 }; 495 496 host = of_find_mipi_dsi_host_by_node(lt->host_node); 497 if (!host) { 498 dev_err(dev, "failed to find dsi host\n"); 499 return -EPROBE_DEFER; 500 } 501 502 dsi = devm_mipi_dsi_device_register_full(dev, host, &info); 503 if (IS_ERR(dsi)) { 504 ret = PTR_ERR(dsi); 505 dev_err(dev, "failed to create dsi device (%d)\n", ret); 506 return ret; 507 } 508 509 lt->dsi = dsi; 510 511 dsi->lanes = lt->data_lanes; 512 dsi->format = MIPI_DSI_FMT_RGB888; 513 514 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 515 MIPI_DSI_MODE_LPM | 516 MIPI_DSI_MODE_NO_EOT_PACKET; 517 518 ret = devm_mipi_dsi_attach(dev, dsi); 519 if (ret < 0) { 520 dev_err(dev, "failed to attach dsi to host\n"); 521 return ret; 522 } 523 524 return 0; 525 } 526 527 static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status) 528 { 529 struct lt8912 *lt = data; 530 531 if (lt->bridge.dev) 532 drm_helper_hpd_irq_event(lt->bridge.dev); 533 } 534 535 static int lt8912_bridge_connector_init(struct drm_bridge *bridge) 536 { 537 int ret; 538 struct lt8912 *lt = bridge_to_lt8912(bridge); 539 struct drm_connector *connector = <->connector; 540 541 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) { 542 drm_bridge_hpd_enable(lt->hdmi_port, lt8912_bridge_hpd_cb, lt); 543 connector->polled = DRM_CONNECTOR_POLL_HPD; 544 } else { 545 connector->polled = DRM_CONNECTOR_POLL_CONNECT | 546 DRM_CONNECTOR_POLL_DISCONNECT; 547 } 548 549 ret = drm_connector_init(bridge->dev, connector, 550 <8912_connector_funcs, 551 lt->hdmi_port->type); 552 if (ret) 553 goto exit; 554 555 drm_connector_helper_add(connector, <8912_connector_helper_funcs); 556 557 connector->dpms = DRM_MODE_DPMS_OFF; 558 drm_connector_attach_encoder(connector, bridge->encoder); 559 560 exit: 561 return ret; 562 } 563 564 static int lt8912_bridge_attach(struct drm_bridge *bridge, 565 enum drm_bridge_attach_flags flags) 566 { 567 struct lt8912 *lt = bridge_to_lt8912(bridge); 568 int ret; 569 570 ret = drm_bridge_attach(bridge->encoder, lt->hdmi_port, bridge, 571 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 572 if (ret < 0) { 573 dev_err(lt->dev, "Failed to attach next bridge (%d)\n", ret); 574 return ret; 575 } 576 577 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 578 ret = lt8912_bridge_connector_init(bridge); 579 if (ret) { 580 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); 581 return ret; 582 } 583 } 584 585 ret = lt8912_hard_power_on(lt); 586 if (ret) 587 return ret; 588 589 ret = lt8912_soft_power_on(lt); 590 if (ret) 591 goto error; 592 593 return 0; 594 595 error: 596 lt8912_hard_power_off(lt); 597 return ret; 598 } 599 600 static void lt8912_bridge_detach(struct drm_bridge *bridge) 601 { 602 struct lt8912 *lt = bridge_to_lt8912(bridge); 603 604 lt8912_hard_power_off(lt); 605 606 if (lt->connector.dev && lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) 607 drm_bridge_hpd_disable(lt->hdmi_port); 608 } 609 610 static enum drm_connector_status 611 lt8912_bridge_detect(struct drm_bridge *bridge) 612 { 613 struct lt8912 *lt = bridge_to_lt8912(bridge); 614 615 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 616 return drm_bridge_detect(lt->hdmi_port); 617 618 return lt8912_check_cable_status(lt); 619 } 620 621 static const struct drm_edid *lt8912_bridge_edid_read(struct drm_bridge *bridge, 622 struct drm_connector *connector) 623 { 624 struct lt8912 *lt = bridge_to_lt8912(bridge); 625 626 /* 627 * edid must be read through the ddc bus but it must be 628 * given to the hdmi connector node. 629 */ 630 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) 631 return drm_bridge_edid_read(lt->hdmi_port, connector); 632 633 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); 634 return NULL; 635 } 636 637 static const struct drm_bridge_funcs lt8912_bridge_funcs = { 638 .attach = lt8912_bridge_attach, 639 .detach = lt8912_bridge_detach, 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->hdmi_port = of_drm_find_bridge(port_node); 727 if (!lt->hdmi_port) { 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_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL); 765 if (!lt) 766 return -ENOMEM; 767 768 lt->dev = dev; 769 lt->i2c_client[0] = client; 770 771 ret = lt8912_parse_dt(lt); 772 if (ret) 773 goto err_dt_parse; 774 775 ret = lt8912_init_i2c(lt, client); 776 if (ret) 777 goto err_i2c; 778 779 i2c_set_clientdata(client, lt); 780 781 lt->bridge.funcs = <8912_bridge_funcs; 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", 0}, 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