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 u8 data_lanes; 47 bool is_power_on; 48 }; 49 50 static int lt8912_write_init_config(struct lt8912 *lt) 51 { 52 const struct reg_sequence seq[] = { 53 /* Digital clock en*/ 54 {0x08, 0xff}, 55 {0x09, 0xff}, 56 {0x0a, 0xff}, 57 {0x0b, 0x7c}, 58 {0x0c, 0xff}, 59 {0x42, 0x04}, 60 61 /*Tx Analog*/ 62 {0x31, 0xb1}, 63 {0x32, 0xb1}, 64 {0x33, 0x0e}, 65 {0x37, 0x00}, 66 {0x38, 0x22}, 67 {0x60, 0x82}, 68 69 /*Cbus Analog*/ 70 {0x39, 0x45}, 71 {0x3a, 0x00}, 72 {0x3b, 0x00}, 73 74 /*HDMI Pll Analog*/ 75 {0x44, 0x31}, 76 {0x55, 0x44}, 77 {0x57, 0x01}, 78 {0x5a, 0x02}, 79 80 /*MIPI Analog*/ 81 {0x3e, 0xd6}, 82 {0x3f, 0xd4}, 83 {0x41, 0x3c}, 84 {0xB2, 0x00}, 85 }; 86 87 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); 88 } 89 90 static int lt8912_write_mipi_basic_config(struct lt8912 *lt) 91 { 92 const struct reg_sequence seq[] = { 93 {0x12, 0x04}, 94 {0x14, 0x00}, 95 {0x15, 0x00}, 96 {0x1a, 0x03}, 97 {0x1b, 0x03}, 98 }; 99 100 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); 101 }; 102 103 static int lt8912_write_dds_config(struct lt8912 *lt) 104 { 105 const struct reg_sequence seq[] = { 106 {0x4e, 0xff}, 107 {0x4f, 0x56}, 108 {0x50, 0x69}, 109 {0x51, 0x80}, 110 {0x1f, 0x5e}, 111 {0x20, 0x01}, 112 {0x21, 0x2c}, 113 {0x22, 0x01}, 114 {0x23, 0xfa}, 115 {0x24, 0x00}, 116 {0x25, 0xc8}, 117 {0x26, 0x00}, 118 {0x27, 0x5e}, 119 {0x28, 0x01}, 120 {0x29, 0x2c}, 121 {0x2a, 0x01}, 122 {0x2b, 0xfa}, 123 {0x2c, 0x00}, 124 {0x2d, 0xc8}, 125 {0x2e, 0x00}, 126 {0x42, 0x64}, 127 {0x43, 0x00}, 128 {0x44, 0x04}, 129 {0x45, 0x00}, 130 {0x46, 0x59}, 131 {0x47, 0x00}, 132 {0x48, 0xf2}, 133 {0x49, 0x06}, 134 {0x4a, 0x00}, 135 {0x4b, 0x72}, 136 {0x4c, 0x45}, 137 {0x4d, 0x00}, 138 {0x52, 0x08}, 139 {0x53, 0x00}, 140 {0x54, 0xb2}, 141 {0x55, 0x00}, 142 {0x56, 0xe4}, 143 {0x57, 0x0d}, 144 {0x58, 0x00}, 145 {0x59, 0xe4}, 146 {0x5a, 0x8a}, 147 {0x5b, 0x00}, 148 {0x5c, 0x34}, 149 {0x1e, 0x4f}, 150 {0x51, 0x00}, 151 }; 152 153 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); 154 } 155 156 static int lt8912_write_rxlogicres_config(struct lt8912 *lt) 157 { 158 int ret; 159 160 ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f); 161 usleep_range(10000, 20000); 162 ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff); 163 164 return ret; 165 }; 166 167 /* enable LVDS output with some hardcoded configuration, not required for the HDMI output */ 168 static int lt8912_write_lvds_config(struct lt8912 *lt) 169 { 170 const struct reg_sequence seq[] = { 171 // lvds power up 172 {0x44, 0x30}, 173 {0x51, 0x05}, 174 175 // core pll bypass 176 {0x50, 0x24}, // cp=50uA 177 {0x51, 0x2d}, // Pix_clk as reference, second order passive LPF PLL 178 {0x52, 0x04}, // loopdiv=0, use second-order PLL 179 {0x69, 0x0e}, // CP_PRESET_DIV_RATIO 180 {0x69, 0x8e}, 181 {0x6a, 0x00}, 182 {0x6c, 0xb8}, // RGD_CP_SOFT_K_EN,RGD_CP_SOFT_K[13:8] 183 {0x6b, 0x51}, 184 185 {0x04, 0xfb}, // core pll reset 186 {0x04, 0xff}, 187 188 // scaler bypass 189 {0x7f, 0x00}, // disable scaler 190 {0xa8, 0x13}, // 0x13: JEIDA, 0x33: VESA 191 192 {0x02, 0xf7}, // lvds pll reset 193 {0x02, 0xff}, 194 {0x03, 0xcf}, 195 {0x03, 0xff}, 196 }; 197 198 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); 199 }; 200 201 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) 202 { 203 return container_of(b, struct lt8912, bridge); 204 } 205 206 static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c) 207 { 208 return container_of(c, struct lt8912, connector); 209 } 210 211 static const struct regmap_config lt8912_regmap_config = { 212 .reg_bits = 8, 213 .val_bits = 8, 214 .max_register = 0xff, 215 }; 216 217 static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client) 218 { 219 unsigned int i; 220 /* 221 * At this time we only initialize 2 chips, but the lt8912 provides 222 * a third interface for the audio over HDMI configuration. 223 */ 224 struct i2c_board_info info[] = { 225 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), }, 226 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), }, 227 }; 228 229 if (!lt) 230 return -ENODEV; 231 232 for (i = 0; i < ARRAY_SIZE(info); i++) { 233 if (i > 0) { 234 lt->i2c_client[i] = i2c_new_dummy_device(client->adapter, 235 info[i].addr); 236 if (IS_ERR(lt->i2c_client[i])) 237 return PTR_ERR(lt->i2c_client[i]); 238 } 239 240 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i], 241 <8912_regmap_config); 242 if (IS_ERR(lt->regmap[i])) 243 return PTR_ERR(lt->regmap[i]); 244 } 245 return 0; 246 } 247 248 static int lt8912_free_i2c(struct lt8912 *lt) 249 { 250 unsigned int i; 251 252 for (i = 1; i < I2C_MAX_IDX; i++) 253 i2c_unregister_device(lt->i2c_client[i]); 254 255 return 0; 256 } 257 258 static int lt8912_hard_power_on(struct lt8912 *lt) 259 { 260 gpiod_set_value_cansleep(lt->gp_reset, 0); 261 msleep(20); 262 263 return 0; 264 } 265 266 static void lt8912_hard_power_off(struct lt8912 *lt) 267 { 268 gpiod_set_value_cansleep(lt->gp_reset, 1); 269 msleep(20); 270 lt->is_power_on = false; 271 } 272 273 static int lt8912_video_setup(struct lt8912 *lt) 274 { 275 u32 hactive, h_total, hpw, hfp, hbp; 276 u32 vactive, v_total, vpw, vfp, vbp; 277 u8 settle = 0x08; 278 int ret, hsync_activehigh, vsync_activehigh; 279 280 if (!lt) 281 return -EINVAL; 282 283 hactive = lt->mode.hactive; 284 hfp = lt->mode.hfront_porch; 285 hpw = lt->mode.hsync_len; 286 hbp = lt->mode.hback_porch; 287 h_total = hactive + hfp + hpw + hbp; 288 hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH; 289 290 vactive = lt->mode.vactive; 291 vfp = lt->mode.vfront_porch; 292 vpw = lt->mode.vsync_len; 293 vbp = lt->mode.vback_porch; 294 v_total = vactive + vfp + vpw + vbp; 295 vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH; 296 297 if (vactive <= 600) 298 settle = 0x04; 299 else if (vactive == 1080) 300 settle = 0x0a; 301 302 ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01); 303 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle); 304 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw); 305 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw); 306 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff); 307 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8); 308 309 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c); 310 311 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff); 312 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8); 313 314 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff); 315 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8); 316 317 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff); 318 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8); 319 320 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff); 321 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8); 322 323 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff); 324 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8); 325 326 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff); 327 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8); 328 329 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0), 330 vsync_activehigh ? BIT(0) : 0); 331 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1), 332 hsync_activehigh ? BIT(1) : 0); 333 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0), 334 lt->connector.display_info.is_hdmi ? BIT(0) : 0); 335 336 return ret; 337 } 338 339 static int lt8912_soft_power_on(struct lt8912 *lt) 340 { 341 if (!lt->is_power_on) { 342 u32 lanes = lt->data_lanes; 343 344 lt8912_write_init_config(lt); 345 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); 346 347 lt8912_write_mipi_basic_config(lt); 348 349 lt->is_power_on = true; 350 } 351 352 return 0; 353 } 354 355 static int lt8912_video_on(struct lt8912 *lt) 356 { 357 int ret; 358 359 ret = lt8912_video_setup(lt); 360 if (ret < 0) 361 goto end; 362 363 ret = lt8912_write_dds_config(lt); 364 if (ret < 0) 365 goto end; 366 367 ret = lt8912_write_rxlogicres_config(lt); 368 if (ret < 0) 369 goto end; 370 371 ret = lt8912_write_lvds_config(lt); 372 if (ret < 0) 373 goto end; 374 375 end: 376 return ret; 377 } 378 379 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) 380 { 381 int ret; 382 unsigned int reg_val; 383 384 ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); 385 if (ret) 386 return connector_status_unknown; 387 388 if (reg_val & BIT(7)) 389 return connector_status_connected; 390 391 return connector_status_disconnected; 392 } 393 394 static enum drm_connector_status 395 lt8912_connector_detect(struct drm_connector *connector, bool force) 396 { 397 struct lt8912 *lt = connector_to_lt8912(connector); 398 399 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 400 return drm_bridge_detect(lt->hdmi_port); 401 402 return lt8912_check_cable_status(lt); 403 } 404 405 static const struct drm_connector_funcs lt8912_connector_funcs = { 406 .detect = lt8912_connector_detect, 407 .fill_modes = drm_helper_probe_single_connector_modes, 408 .destroy = drm_connector_cleanup, 409 .reset = drm_atomic_helper_connector_reset, 410 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 411 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 412 }; 413 414 static enum drm_mode_status 415 lt8912_connector_mode_valid(struct drm_connector *connector, 416 struct drm_display_mode *mode) 417 { 418 if (mode->clock > 150000) 419 return MODE_CLOCK_HIGH; 420 421 if (mode->hdisplay > 1920) 422 return MODE_BAD_HVALUE; 423 424 if (mode->vdisplay > 1080) 425 return MODE_BAD_VVALUE; 426 427 return MODE_OK; 428 } 429 430 static int lt8912_connector_get_modes(struct drm_connector *connector) 431 { 432 const struct drm_edid *drm_edid; 433 struct lt8912 *lt = connector_to_lt8912(connector); 434 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 435 int ret, num; 436 437 drm_edid = drm_bridge_edid_read(lt->hdmi_port, connector); 438 drm_edid_connector_update(connector, drm_edid); 439 if (!drm_edid) 440 return 0; 441 442 num = drm_edid_connector_add_modes(connector); 443 444 ret = drm_display_info_set_bus_formats(&connector->display_info, 445 &bus_format, 1); 446 if (ret < 0) 447 num = 0; 448 449 drm_edid_free(drm_edid); 450 return num; 451 } 452 453 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { 454 .get_modes = lt8912_connector_get_modes, 455 .mode_valid = lt8912_connector_mode_valid, 456 }; 457 458 static void lt8912_bridge_mode_set(struct drm_bridge *bridge, 459 const struct drm_display_mode *mode, 460 const struct drm_display_mode *adj) 461 { 462 struct lt8912 *lt = bridge_to_lt8912(bridge); 463 464 drm_display_mode_to_videomode(adj, <->mode); 465 } 466 467 static void lt8912_bridge_enable(struct drm_bridge *bridge) 468 { 469 struct lt8912 *lt = bridge_to_lt8912(bridge); 470 471 lt8912_video_on(lt); 472 } 473 474 static int lt8912_attach_dsi(struct lt8912 *lt) 475 { 476 struct device *dev = lt->dev; 477 struct mipi_dsi_host *host; 478 struct mipi_dsi_device *dsi; 479 int ret = -1; 480 const struct mipi_dsi_device_info info = { .type = "lt8912", 481 .channel = 0, 482 .node = NULL, 483 }; 484 485 host = of_find_mipi_dsi_host_by_node(lt->host_node); 486 if (!host) 487 return dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n"); 488 489 dsi = devm_mipi_dsi_device_register_full(dev, host, &info); 490 if (IS_ERR(dsi)) { 491 ret = PTR_ERR(dsi); 492 dev_err(dev, "failed to create dsi device (%d)\n", ret); 493 return ret; 494 } 495 496 lt->dsi = dsi; 497 498 dsi->lanes = lt->data_lanes; 499 dsi->format = MIPI_DSI_FMT_RGB888; 500 501 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 502 MIPI_DSI_MODE_LPM | 503 MIPI_DSI_MODE_NO_EOT_PACKET; 504 505 ret = devm_mipi_dsi_attach(dev, dsi); 506 if (ret < 0) { 507 dev_err(dev, "failed to attach dsi to host\n"); 508 return ret; 509 } 510 511 return 0; 512 } 513 514 static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status) 515 { 516 struct lt8912 *lt = data; 517 518 if (lt->bridge.dev) 519 drm_helper_hpd_irq_event(lt->bridge.dev); 520 } 521 522 static int lt8912_bridge_connector_init(struct drm_bridge *bridge) 523 { 524 int ret; 525 struct lt8912 *lt = bridge_to_lt8912(bridge); 526 struct drm_connector *connector = <->connector; 527 528 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) { 529 drm_bridge_hpd_enable(lt->hdmi_port, lt8912_bridge_hpd_cb, lt); 530 connector->polled = DRM_CONNECTOR_POLL_HPD; 531 } else { 532 connector->polled = DRM_CONNECTOR_POLL_CONNECT | 533 DRM_CONNECTOR_POLL_DISCONNECT; 534 } 535 536 ret = drm_connector_init(bridge->dev, connector, 537 <8912_connector_funcs, 538 lt->hdmi_port->type); 539 if (ret) 540 goto exit; 541 542 drm_connector_helper_add(connector, <8912_connector_helper_funcs); 543 544 connector->dpms = DRM_MODE_DPMS_OFF; 545 drm_connector_attach_encoder(connector, bridge->encoder); 546 547 exit: 548 return ret; 549 } 550 551 static int lt8912_bridge_attach(struct drm_bridge *bridge, 552 enum drm_bridge_attach_flags flags) 553 { 554 struct lt8912 *lt = bridge_to_lt8912(bridge); 555 int ret; 556 557 ret = drm_bridge_attach(bridge->encoder, lt->hdmi_port, bridge, 558 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 559 if (ret < 0) { 560 dev_err(lt->dev, "Failed to attach next bridge (%d)\n", ret); 561 return ret; 562 } 563 564 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 565 ret = lt8912_bridge_connector_init(bridge); 566 if (ret) { 567 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); 568 return ret; 569 } 570 } 571 572 ret = lt8912_hard_power_on(lt); 573 if (ret) 574 return ret; 575 576 ret = lt8912_soft_power_on(lt); 577 if (ret) 578 goto error; 579 580 return 0; 581 582 error: 583 lt8912_hard_power_off(lt); 584 return ret; 585 } 586 587 static void lt8912_bridge_detach(struct drm_bridge *bridge) 588 { 589 struct lt8912 *lt = bridge_to_lt8912(bridge); 590 591 lt8912_hard_power_off(lt); 592 593 if (lt->connector.dev && lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) 594 drm_bridge_hpd_disable(lt->hdmi_port); 595 } 596 597 static enum drm_connector_status 598 lt8912_bridge_detect(struct drm_bridge *bridge) 599 { 600 struct lt8912 *lt = bridge_to_lt8912(bridge); 601 602 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 603 return drm_bridge_detect(lt->hdmi_port); 604 605 return lt8912_check_cable_status(lt); 606 } 607 608 static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge, 609 struct drm_connector *connector) 610 { 611 struct lt8912 *lt = bridge_to_lt8912(bridge); 612 613 /* 614 * edid must be read through the ddc bus but it must be 615 * given to the hdmi connector node. 616 */ 617 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) 618 return drm_bridge_get_edid(lt->hdmi_port, connector); 619 620 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); 621 return NULL; 622 } 623 624 static const struct drm_bridge_funcs lt8912_bridge_funcs = { 625 .attach = lt8912_bridge_attach, 626 .detach = lt8912_bridge_detach, 627 .mode_set = lt8912_bridge_mode_set, 628 .enable = lt8912_bridge_enable, 629 .detect = lt8912_bridge_detect, 630 .get_edid = lt8912_bridge_get_edid, 631 }; 632 633 static int lt8912_parse_dt(struct lt8912 *lt) 634 { 635 struct gpio_desc *gp_reset; 636 struct device *dev = lt->dev; 637 int ret; 638 int data_lanes; 639 struct device_node *port_node; 640 641 gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 642 if (IS_ERR(gp_reset)) { 643 ret = PTR_ERR(gp_reset); 644 if (ret != -EPROBE_DEFER) 645 dev_err(dev, "Failed to get reset gpio: %d\n", ret); 646 return ret; 647 } 648 lt->gp_reset = gp_reset; 649 650 data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4); 651 if (data_lanes < 0) { 652 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__); 653 return data_lanes; 654 } 655 656 lt->data_lanes = data_lanes; 657 658 lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1); 659 if (!lt->host_node) { 660 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__); 661 return -ENODEV; 662 } 663 664 port_node = of_graph_get_remote_node(dev->of_node, 1, -1); 665 if (!port_node) { 666 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__); 667 ret = -ENODEV; 668 goto err_free_host_node; 669 } 670 671 lt->hdmi_port = of_drm_find_bridge(port_node); 672 if (!lt->hdmi_port) { 673 ret = -EPROBE_DEFER; 674 dev_err_probe(lt->dev, ret, "%s: Failed to get hdmi port\n", __func__); 675 goto err_free_host_node; 676 } 677 678 if (!of_device_is_compatible(port_node, "hdmi-connector")) { 679 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); 680 ret = -EINVAL; 681 goto err_free_host_node; 682 } 683 684 of_node_put(port_node); 685 return 0; 686 687 err_free_host_node: 688 of_node_put(port_node); 689 of_node_put(lt->host_node); 690 return ret; 691 } 692 693 static int lt8912_put_dt(struct lt8912 *lt) 694 { 695 of_node_put(lt->host_node); 696 return 0; 697 } 698 699 static int lt8912_probe(struct i2c_client *client) 700 { 701 static struct lt8912 *lt; 702 int ret = 0; 703 struct device *dev = &client->dev; 704 705 lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL); 706 if (!lt) 707 return -ENOMEM; 708 709 lt->dev = dev; 710 lt->i2c_client[0] = client; 711 712 ret = lt8912_parse_dt(lt); 713 if (ret) 714 goto err_dt_parse; 715 716 ret = lt8912_init_i2c(lt, client); 717 if (ret) 718 goto err_i2c; 719 720 i2c_set_clientdata(client, lt); 721 722 lt->bridge.funcs = <8912_bridge_funcs; 723 lt->bridge.of_node = dev->of_node; 724 lt->bridge.ops = (DRM_BRIDGE_OP_EDID | 725 DRM_BRIDGE_OP_DETECT); 726 727 drm_bridge_add(<->bridge); 728 729 ret = lt8912_attach_dsi(lt); 730 if (ret) 731 goto err_attach; 732 733 return 0; 734 735 err_attach: 736 drm_bridge_remove(<->bridge); 737 lt8912_free_i2c(lt); 738 err_i2c: 739 lt8912_put_dt(lt); 740 err_dt_parse: 741 return ret; 742 } 743 744 static void lt8912_remove(struct i2c_client *client) 745 { 746 struct lt8912 *lt = i2c_get_clientdata(client); 747 748 drm_bridge_remove(<->bridge); 749 lt8912_free_i2c(lt); 750 lt8912_put_dt(lt); 751 } 752 753 static const struct of_device_id lt8912_dt_match[] = { 754 {.compatible = "lontium,lt8912b"}, 755 {} 756 }; 757 MODULE_DEVICE_TABLE(of, lt8912_dt_match); 758 759 static const struct i2c_device_id lt8912_id[] = { 760 {"lt8912", 0}, 761 {}, 762 }; 763 MODULE_DEVICE_TABLE(i2c, lt8912_id); 764 765 static struct i2c_driver lt8912_i2c_driver = { 766 .driver = { 767 .name = "lt8912", 768 .of_match_table = lt8912_dt_match, 769 }, 770 .probe = lt8912_probe, 771 .remove = lt8912_remove, 772 .id_table = lt8912_id, 773 }; 774 module_i2c_driver(lt8912_i2c_driver); 775 776 MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>"); 777 MODULE_DESCRIPTION("lt8912 drm driver"); 778 MODULE_LICENSE("GPL v2"); 779