drivers/gpu/drm/panel/panel-leadtek-ltk500hd1829.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2019 Theobroma Systems Design und Consulting GmbH
   4  *
   5  * base on panel-kingdisplay-kd097d04.c
   6  * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
   7  */
   8
   9 #include <linux/backlight.h>
  10 #include <linux/delay.h>
  11 #include <linux/gpio/consumer.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/regulator/consumer.h>
  15
  16 #include <video/mipi_display.h>
  17
  18 #include <drm/drm_crtc.h>
  19 #include <drm/drm_device.h>
  20 #include <drm/drm_mipi_dsi.h>
  21 #include <drm/drm_modes.h>
  22 #include <drm/drm_panel.h>
  23
  24 struct ltk500hd1829 {
  25         struct device *dev;
  26         struct drm_panel panel;
  27         struct gpio_desc *reset_gpio;
  28         struct regulator *vcc;
  29         struct regulator *iovcc;
  30         bool prepared;
  31 };
  32
  33 struct ltk500hd1829_cmd {
  34         char cmd;
  35         char data;
  36 };
  37
  38 /*
  39  * There is no description in the Reference Manual about these commands.
  40  * We received them from the vendor, so just use them as is.
  41  */
  42 static const struct ltk500hd1829_cmd init_code[] = {
  43         { 0xE0, 0x00 },
  44         { 0xE1, 0x93 },
  45         { 0xE2, 0x65 },
  46         { 0xE3, 0xF8 },
  47         { 0x80, 0x03 },
  48         { 0xE0, 0x04 },
  49         { 0x2D, 0x03 },
  50         { 0xE0, 0x01 },
  51         { 0x00, 0x00 },
  52         { 0x01, 0xB6 },
  53         { 0x03, 0x00 },
  54         { 0x04, 0xC5 },
  55         { 0x17, 0x00 },
  56         { 0x18, 0xBF },
  57         { 0x19, 0x01 },
  58         { 0x1A, 0x00 },
  59         { 0x1B, 0xBF },
  60         { 0x1C, 0x01 },
  61         { 0x1F, 0x7C },
  62         { 0x20, 0x26 },
  63         { 0x21, 0x26 },
  64         { 0x22, 0x4E },
  65         { 0x37, 0x09 },
  66         { 0x38, 0x04 },
  67         { 0x39, 0x08 },
  68         { 0x3A, 0x1F },
  69         { 0x3B, 0x1F },
  70         { 0x3C, 0x78 },
  71         { 0x3D, 0xFF },
  72         { 0x3E, 0xFF },
  73         { 0x3F, 0x00 },
  74         { 0x40, 0x04 },
  75         { 0x41, 0xA0 },
  76         { 0x43, 0x0F },
  77         { 0x44, 0x0A },
  78         { 0x45, 0x24 },
  79         { 0x55, 0x01 },
  80         { 0x56, 0x01 },
  81         { 0x57, 0xA5 },
  82         { 0x58, 0x0A },
  83         { 0x59, 0x4A },
  84         { 0x5A, 0x38 },
  85         { 0x5B, 0x10 },
  86         { 0x5C, 0x19 },
  87         { 0x5D, 0x7C },
  88         { 0x5E, 0x64 },
  89         { 0x5F, 0x54 },
  90         { 0x60, 0x48 },
  91         { 0x61, 0x44 },
  92         { 0x62, 0x35 },
  93         { 0x63, 0x3A },
  94         { 0x64, 0x24 },
  95         { 0x65, 0x3B },
  96         { 0x66, 0x39 },
  97         { 0x67, 0x37 },
  98         { 0x68, 0x56 },
  99         { 0x69, 0x41 },
 100         { 0x6A, 0x47 },
 101         { 0x6B, 0x2F },
 102         { 0x6C, 0x23 },
 103         { 0x6D, 0x13 },
 104         { 0x6E, 0x02 },
 105         { 0x6F, 0x08 },
 106         { 0x70, 0x7C },
 107         { 0x71, 0x64 },
 108         { 0x72, 0x54 },
 109         { 0x73, 0x48 },
 110         { 0x74, 0x44 },
 111         { 0x75, 0x35 },
 112         { 0x76, 0x3A },
 113         { 0x77, 0x22 },
 114         { 0x78, 0x3B },
 115         { 0x79, 0x39 },
 116         { 0x7A, 0x38 },
 117         { 0x7B, 0x52 },
 118         { 0x7C, 0x41 },
 119         { 0x7D, 0x47 },
 120         { 0x7E, 0x2F },
 121         { 0x7F, 0x23 },
 122         { 0x80, 0x13 },
 123         { 0x81, 0x02 },
 124         { 0x82, 0x08 },
 125         { 0xE0, 0x02 },
 126         { 0x00, 0x57 },
 127         { 0x01, 0x77 },
 128         { 0x02, 0x44 },
 129         { 0x03, 0x46 },
 130         { 0x04, 0x48 },
 131         { 0x05, 0x4A },
 132         { 0x06, 0x4C },
 133         { 0x07, 0x4E },
 134         { 0x08, 0x50 },
 135         { 0x09, 0x55 },
 136         { 0x0A, 0x52 },
 137         { 0x0B, 0x55 },
 138         { 0x0C, 0x55 },
 139         { 0x0D, 0x55 },
 140         { 0x0E, 0x55 },
 141         { 0x0F, 0x55 },
 142         { 0x10, 0x55 },
 143         { 0x11, 0x55 },
 144         { 0x12, 0x55 },
 145         { 0x13, 0x40 },
 146         { 0x14, 0x55 },
 147         { 0x15, 0x55 },
 148         { 0x16, 0x57 },
 149         { 0x17, 0x77 },
 150         { 0x18, 0x45 },
 151         { 0x19, 0x47 },
 152         { 0x1A, 0x49 },
 153         { 0x1B, 0x4B },
 154         { 0x1C, 0x4D },
 155         { 0x1D, 0x4F },
 156         { 0x1E, 0x51 },
 157         { 0x1F, 0x55 },
 158         { 0x20, 0x53 },
 159         { 0x21, 0x55 },
 160         { 0x22, 0x55 },
 161         { 0x23, 0x55 },
 162         { 0x24, 0x55 },
 163         { 0x25, 0x55 },
 164         { 0x26, 0x55 },
 165         { 0x27, 0x55 },
 166         { 0x28, 0x55 },
 167         { 0x29, 0x41 },
 168         { 0x2A, 0x55 },
 169         { 0x2B, 0x55 },
 170         { 0x2C, 0x57 },
 171         { 0x2D, 0x77 },
 172         { 0x2E, 0x4F },
 173         { 0x2F, 0x4D },
 174         { 0x30, 0x4B },
 175         { 0x31, 0x49 },
 176         { 0x32, 0x47 },
 177         { 0x33, 0x45 },
 178         { 0x34, 0x41 },
 179         { 0x35, 0x55 },
 180         { 0x36, 0x53 },
 181         { 0x37, 0x55 },
 182         { 0x38, 0x55 },
 183         { 0x39, 0x55 },
 184         { 0x3A, 0x55 },
 185         { 0x3B, 0x55 },
 186         { 0x3C, 0x55 },
 187         { 0x3D, 0x55 },
 188         { 0x3E, 0x55 },
 189         { 0x3F, 0x51 },
 190         { 0x40, 0x55 },
 191         { 0x41, 0x55 },
 192         { 0x42, 0x57 },
 193         { 0x43, 0x77 },
 194         { 0x44, 0x4E },
 195         { 0x45, 0x4C },
 196         { 0x46, 0x4A },
 197         { 0x47, 0x48 },
 198         { 0x48, 0x46 },
 199         { 0x49, 0x44 },
 200         { 0x4A, 0x40 },
 201         { 0x4B, 0x55 },
 202         { 0x4C, 0x52 },
 203         { 0x4D, 0x55 },
 204         { 0x4E, 0x55 },
 205         { 0x4F, 0x55 },
 206         { 0x50, 0x55 },
 207         { 0x51, 0x55 },
 208         { 0x52, 0x55 },
 209         { 0x53, 0x55 },
 210         { 0x54, 0x55 },
 211         { 0x55, 0x50 },
 212         { 0x56, 0x55 },
 213         { 0x57, 0x55 },
 214         { 0x58, 0x40 },
 215         { 0x59, 0x00 },
 216         { 0x5A, 0x00 },
 217         { 0x5B, 0x10 },
 218         { 0x5C, 0x09 },
 219         { 0x5D, 0x30 },
 220         { 0x5E, 0x01 },
 221         { 0x5F, 0x02 },
 222         { 0x60, 0x30 },
 223         { 0x61, 0x03 },
 224         { 0x62, 0x04 },
 225         { 0x63, 0x06 },
 226         { 0x64, 0x6A },
 227         { 0x65, 0x75 },
 228         { 0x66, 0x0F },
 229         { 0x67, 0xB3 },
 230         { 0x68, 0x0B },
 231         { 0x69, 0x06 },
 232         { 0x6A, 0x6A },
 233         { 0x6B, 0x10 },
 234         { 0x6C, 0x00 },
 235         { 0x6D, 0x04 },
 236         { 0x6E, 0x04 },
 237         { 0x6F, 0x88 },
 238         { 0x70, 0x00 },
 239         { 0x71, 0x00 },
 240         { 0x72, 0x06 },
 241         { 0x73, 0x7B },
 242         { 0x74, 0x00 },
 243         { 0x75, 0xBC },
 244         { 0x76, 0x00 },
 245         { 0x77, 0x05 },
 246         { 0x78, 0x2E },
 247         { 0x79, 0x00 },
 248         { 0x7A, 0x00 },
 249         { 0x7B, 0x00 },
 250         { 0x7C, 0x00 },
 251         { 0x7D, 0x03 },
 252         { 0x7E, 0x7B },
 253         { 0xE0, 0x04 },
 254         { 0x09, 0x10 },
 255         { 0x2B, 0x2B },
 256         { 0x2E, 0x44 },
 257         { 0xE0, 0x00 },
 258         { 0xE6, 0x02 },
 259         { 0xE7, 0x02 },
 260         { 0x35, 0x00 },
 261 };
 262
 263 static inline
 264 struct ltk500hd1829 *panel_to_ltk500hd1829(struct drm_panel *panel)
 265 {
 266         return container_of(panel, struct ltk500hd1829, panel);
 267 }
 268
 269 static int ltk500hd1829_unprepare(struct drm_panel *panel)
 270 {
 271         struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
 272         struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 273         int ret;
 274
 275         if (!ctx->prepared)
 276                 return 0;
 277
 278         ret = mipi_dsi_dcs_set_display_off(dsi);
 279         if (ret < 0)
 280                 dev_err(panel->dev, "failed to set display off: %d\n", ret);
 281
 282         ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
 283         if (ret < 0) {
 284                 dev_err(panel->dev, "failed to enter sleep mode: %d\n", ret);
 285         }
 286
 287         /* 120ms to enter sleep mode */
 288         msleep(120);
 289
 290         regulator_disable(ctx->iovcc);
 291         regulator_disable(ctx->vcc);
 292
 293         ctx->prepared = false;
 294
 295         return 0;
 296 }
 297
 298 static int ltk500hd1829_prepare(struct drm_panel *panel)
 299 {
 300         struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
 301         struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 302         unsigned int i;
 303         int ret;
 304
 305         if (ctx->prepared)
 306                 return 0;
 307
 308         ret = regulator_enable(ctx->vcc);
 309         if (ret < 0) {
 310                 dev_err(ctx->dev, "Failed to enable vci supply: %d\n", ret);
 311                 return ret;
 312         }
 313         ret = regulator_enable(ctx->iovcc);
 314         if (ret < 0) {
 315                 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
 316                 goto disable_vcc;
 317         }
 318
 319         gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 320         /* tRW: 10us */
 321         usleep_range(10, 20);
 322         gpiod_set_value_cansleep(ctx->reset_gpio, 0);
 323
 324         /* tRT: >= 5ms */
 325         usleep_range(5000, 6000);
 326
 327         for (i = 0; i < ARRAY_SIZE(init_code); i++) {
 328                 ret = mipi_dsi_generic_write(dsi, &init_code[i],
 329                                              sizeof(struct ltk500hd1829_cmd));
 330                 if (ret < 0) {
 331                         dev_err(panel->dev, "failed to write init cmds: %d\n", ret);
 332                         goto disable_iovcc;
 333                 }
 334         }
 335
 336         ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 337         if (ret < 0) {
 338                 dev_err(panel->dev, "failed to exit sleep mode: %d\n", ret);
 339                 goto disable_iovcc;
 340         }
 341
 342         /* 120ms to exit sleep mode */
 343         msleep(120);
 344
 345         ret = mipi_dsi_dcs_set_display_on(dsi);
 346         if (ret < 0) {
 347                 dev_err(panel->dev, "failed to set display on: %d\n", ret);
 348                 goto disable_iovcc;
 349         }
 350
 351         ctx->prepared = true;
 352
 353         return 0;
 354
 355 disable_iovcc:
 356         regulator_disable(ctx->iovcc);
 357 disable_vcc:
 358         regulator_disable(ctx->vcc);
 359         return ret;
 360 }
 361
 362 static const struct drm_display_mode default_mode = {
 363         .hdisplay       = 720,
 364         .hsync_start    = 720 + 50,
 365         .hsync_end      = 720 + 50 + 50,
 366         .htotal         = 720 + 50 + 50 + 50,
 367         .vdisplay       = 1280,
 368         .vsync_start    = 1280 + 30,
 369         .vsync_end      = 1280 + 30 + 4,
 370         .vtotal         = 1280 + 30 + 4 + 12,
 371         .clock          = 69217,
 372         .width_mm       = 62,
 373         .height_mm      = 110,
 374 };
 375
 376 static int ltk500hd1829_get_modes(struct drm_panel *panel,
 377                                   struct drm_connector *connector)
 378 {
 379         struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
 380         struct drm_display_mode *mode;
 381
 382         mode = drm_mode_duplicate(connector->dev, &default_mode);
 383         if (!mode) {
 384                 dev_err(ctx->dev, "failed to add mode %ux%u@%u\n",
 385                         default_mode.hdisplay, default_mode.vdisplay,
 386                         drm_mode_vrefresh(&default_mode));
 387                 return -ENOMEM;
 388         }
 389
 390         drm_mode_set_name(mode);
 391
 392         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 393         connector->display_info.width_mm = mode->width_mm;
 394         connector->display_info.height_mm = mode->height_mm;
 395         drm_mode_probed_add(connector, mode);
 396
 397         return 1;
 398 }
 399
 400 static const struct drm_panel_funcs ltk500hd1829_funcs = {
 401         .unprepare = ltk500hd1829_unprepare,
 402         .prepare = ltk500hd1829_prepare,
 403         .get_modes = ltk500hd1829_get_modes,
 404 };
 405
 406 static int ltk500hd1829_probe(struct mipi_dsi_device *dsi)
 407 {
 408         struct ltk500hd1829 *ctx;
 409         struct device *dev = &dsi->dev;
 410         int ret;
 411
 412         ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
 413         if (!ctx)
 414                 return -ENOMEM;
 415
 416         ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 417         if (IS_ERR(ctx->reset_gpio)) {
 418                 dev_err(dev, "cannot get reset gpio\n");
 419                 return PTR_ERR(ctx->reset_gpio);
 420         }
 421
 422         ctx->vcc = devm_regulator_get(dev, "vcc");
 423         if (IS_ERR(ctx->vcc)) {
 424                 ret = PTR_ERR(ctx->vcc);
 425                 if (ret != -EPROBE_DEFER)
 426                         dev_err(dev, "Failed to request vcc regulator: %d\n", ret);
 427                 return ret;
 428         }
 429
 430         ctx->iovcc = devm_regulator_get(dev, "iovcc");
 431         if (IS_ERR(ctx->iovcc)) {
 432                 ret = PTR_ERR(ctx->iovcc);
 433                 if (ret != -EPROBE_DEFER)
 434                         dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
 435                 return ret;
 436         }
 437
 438         mipi_dsi_set_drvdata(dsi, ctx);
 439
 440         ctx->dev = dev;
 441
 442         dsi->lanes = 4;
 443         dsi->format = MIPI_DSI_FMT_RGB888;
 444         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
 445                           MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET;
 446
 447         drm_panel_init(&ctx->panel, &dsi->dev, &ltk500hd1829_funcs,
 448                        DRM_MODE_CONNECTOR_DSI);
 449
 450         ret = drm_panel_of_backlight(&ctx->panel);
 451         if (ret)
 452                 return ret;
 453
 454         drm_panel_add(&ctx->panel);
 455
 456         ret = mipi_dsi_attach(dsi);
 457         if (ret < 0) {
 458                 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
 459                 drm_panel_remove(&ctx->panel);
 460                 return ret;
 461         }
 462
 463         return 0;
 464 }
 465
 466 static void ltk500hd1829_shutdown(struct mipi_dsi_device *dsi)
 467 {
 468         struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
 469         int ret;
 470
 471         ret = drm_panel_unprepare(&ctx->panel);
 472         if (ret < 0)
 473                 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
 474
 475         ret = drm_panel_disable(&ctx->panel);
 476         if (ret < 0)
 477                 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
 478 }
 479
 480 static int ltk500hd1829_remove(struct mipi_dsi_device *dsi)
 481 {
 482         struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
 483         int ret;
 484
 485         ltk500hd1829_shutdown(dsi);
 486
 487         ret = mipi_dsi_detach(dsi);
 488         if (ret < 0)
 489                 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
 490
 491         drm_panel_remove(&ctx->panel);
 492
 493         return 0;
 494 }
 495
 496 static const struct of_device_id ltk500hd1829_of_match[] = {
 497         { .compatible = "leadtek,ltk500hd1829", },
 498         { /* sentinel */ }
 499 };
 500 MODULE_DEVICE_TABLE(of, ltk500hd1829_of_match);
 501
 502 static struct mipi_dsi_driver ltk500hd1829_driver = {
 503         .driver = {
 504                 .name = "panel-leadtek-ltk500hd1829",
 505                 .of_match_table = ltk500hd1829_of_match,
 506         },
 507         .probe = ltk500hd1829_probe,
 508         .remove = ltk500hd1829_remove,
 509         .shutdown = ltk500hd1829_shutdown,
 510 };
 511 module_mipi_dsi_driver(ltk500hd1829_driver);
 512
 513 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
 514 MODULE_DESCRIPTION("Leadtek LTK500HD1829 panel driver");
 515 MODULE_LICENSE("GPL v2");