drivers/gpu/drm/panel/panel-jdi-lt070me05000.c

   1 /*
   2  * Copyright (C) 2016 InforceComputing
   3  * Author: Vinay Simha BN <simhavcs@gmail.com>
   4  *
   5  * Copyright (C) 2016 Linaro Ltd
   6  * Author: Sumit Semwal <sumit.semwal@linaro.org>
   7  *
   8  * From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a
   9  * JDI model LT070ME05000, and its data sheet is at:
  10  * http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License version 2 as published by
  14  * the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but WITHOUT
  17  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  19  * more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along with
  22  * this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24 #include <linux/backlight.h>
  25 #include <linux/gpio/consumer.h>
  26 #include <linux/module.h>
  27 #include <linux/of.h>
  28 #include <linux/regulator/consumer.h>
  29
  30 #include <drm/drmP.h>
  31 #include <drm/drm_crtc.h>
  32 #include <drm/drm_mipi_dsi.h>
  33 #include <drm/drm_panel.h>
  34
  35 #include <video/mipi_display.h>
  36
  37 static const char * const regulator_names[] = {
  38         "vddp",
  39         "iovcc"
  40 };
  41
  42 struct jdi_panel {
  43         struct drm_panel base;
  44         struct mipi_dsi_device *dsi;
  45
  46         struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
  47
  48         struct gpio_desc *enable_gpio;
  49         struct gpio_desc *reset_gpio;
  50         struct gpio_desc *dcdc_en_gpio;
  51         struct backlight_device *backlight;
  52
  53         bool prepared;
  54         bool enabled;
  55
  56         const struct drm_display_mode *mode;
  57 };
  58
  59 static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel)
  60 {
  61         return container_of(panel, struct jdi_panel, base);
  62 }
  63
  64 static int jdi_panel_init(struct jdi_panel *jdi)
  65 {
  66         struct mipi_dsi_device *dsi = jdi->dsi;
  67         struct device *dev = &jdi->dsi->dev;
  68         int ret;
  69
  70         dsi->mode_flags |= MIPI_DSI_MODE_LPM;
  71
  72         ret = mipi_dsi_dcs_soft_reset(dsi);
  73         if (ret < 0)
  74                 return ret;
  75
  76         usleep_range(10000, 20000);
  77
  78         ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
  79         if (ret < 0) {
  80                 dev_err(dev, "failed to set pixel format: %d\n", ret);
  81                 return ret;
  82         }
  83
  84         ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
  85         if (ret < 0) {
  86                 dev_err(dev, "failed to set column address: %d\n", ret);
  87                 return ret;
  88         }
  89
  90         ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
  91         if (ret < 0) {
  92                 dev_err(dev, "failed to set page address: %d\n", ret);
  93                 return ret;
  94         }
  95
  96         /*
  97          * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
  98          *                  are active
  99          * BIT(3) BL = 1    Backlight Control On
 100          * BIT(2) DD = 0    Display Dimming is Off
 101          */
 102         ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 103                                  (u8[]){ 0x24 }, 1);
 104         if (ret < 0) {
 105                 dev_err(dev, "failed to write control display: %d\n", ret);
 106                 return ret;
 107         }
 108
 109         /* CABC off */
 110         ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
 111                                  (u8[]){ 0x00 }, 1);
 112         if (ret < 0) {
 113                 dev_err(dev, "failed to set cabc off: %d\n", ret);
 114                 return ret;
 115         }
 116
 117         ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 118         if (ret < 0) {
 119                 dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
 120                 return ret;
 121         }
 122
 123         msleep(120);
 124
 125         ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
 126         if (ret < 0) {
 127                 dev_err(dev, "failed to set mcap: %d\n", ret);
 128                 return ret;
 129         }
 130
 131         mdelay(10);
 132
 133         /* Interface setting, video mode */
 134         ret = mipi_dsi_generic_write(dsi, (u8[])
 135                                      {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
 136         if (ret < 0) {
 137                 dev_err(dev, "failed to set display interface setting: %d\n"
 138                         , ret);
 139                 return ret;
 140         }
 141
 142         mdelay(20);
 143
 144         ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
 145         if (ret < 0) {
 146                 dev_err(dev, "failed to set default values for mcap: %d\n"
 147                         , ret);
 148                 return ret;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static int jdi_panel_on(struct jdi_panel *jdi)
 155 {
 156         struct mipi_dsi_device *dsi = jdi->dsi;
 157         struct device *dev = &jdi->dsi->dev;
 158         int ret;
 159
 160         dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 161
 162         ret = mipi_dsi_dcs_set_display_on(dsi);
 163         if (ret < 0)
 164                 dev_err(dev, "failed to set display on: %d\n", ret);
 165
 166         return ret;
 167 }
 168
 169 static void jdi_panel_off(struct jdi_panel *jdi)
 170 {
 171         struct mipi_dsi_device *dsi = jdi->dsi;
 172         struct device *dev = &jdi->dsi->dev;
 173         int ret;
 174
 175         dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
 176
 177         ret = mipi_dsi_dcs_set_display_off(dsi);
 178         if (ret < 0)
 179                 dev_err(dev, "failed to set display off: %d\n", ret);
 180
 181         ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
 182         if (ret < 0)
 183                 dev_err(dev, "failed to enter sleep mode: %d\n", ret);
 184
 185         msleep(100);
 186 }
 187
 188 static int jdi_panel_disable(struct drm_panel *panel)
 189 {
 190         struct jdi_panel *jdi = to_jdi_panel(panel);
 191
 192         if (!jdi->enabled)
 193                 return 0;
 194
 195         jdi->backlight->props.power = FB_BLANK_POWERDOWN;
 196         backlight_update_status(jdi->backlight);
 197
 198         jdi->enabled = false;
 199
 200         return 0;
 201 }
 202
 203 static int jdi_panel_unprepare(struct drm_panel *panel)
 204 {
 205         struct jdi_panel *jdi = to_jdi_panel(panel);
 206         struct device *dev = &jdi->dsi->dev;
 207         int ret;
 208
 209         if (!jdi->prepared)
 210                 return 0;
 211
 212         jdi_panel_off(jdi);
 213
 214         ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
 215         if (ret < 0)
 216                 dev_err(dev, "regulator disable failed, %d\n", ret);
 217
 218         gpiod_set_value(jdi->enable_gpio, 0);
 219
 220         gpiod_set_value(jdi->reset_gpio, 1);
 221
 222         gpiod_set_value(jdi->dcdc_en_gpio, 0);
 223
 224         jdi->prepared = false;
 225
 226         return 0;
 227 }
 228
 229 static int jdi_panel_prepare(struct drm_panel *panel)
 230 {
 231         struct jdi_panel *jdi = to_jdi_panel(panel);
 232         struct device *dev = &jdi->dsi->dev;
 233         int ret;
 234
 235         if (jdi->prepared)
 236                 return 0;
 237
 238         ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
 239         if (ret < 0) {
 240                 dev_err(dev, "regulator enable failed, %d\n", ret);
 241                 return ret;
 242         }
 243
 244         msleep(20);
 245
 246         gpiod_set_value(jdi->dcdc_en_gpio, 1);
 247         usleep_range(10, 20);
 248
 249         gpiod_set_value(jdi->reset_gpio, 0);
 250         usleep_range(10, 20);
 251
 252         gpiod_set_value(jdi->enable_gpio, 1);
 253         usleep_range(10, 20);
 254
 255         ret = jdi_panel_init(jdi);
 256         if (ret < 0) {
 257                 dev_err(dev, "failed to init panel: %d\n", ret);
 258                 goto poweroff;
 259         }
 260
 261         ret = jdi_panel_on(jdi);
 262         if (ret < 0) {
 263                 dev_err(dev, "failed to set panel on: %d\n", ret);
 264                 goto poweroff;
 265         }
 266
 267         jdi->prepared = true;
 268
 269         return 0;
 270
 271 poweroff:
 272         ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
 273         if (ret < 0)
 274                 dev_err(dev, "regulator disable failed, %d\n", ret);
 275
 276         gpiod_set_value(jdi->enable_gpio, 0);
 277
 278         gpiod_set_value(jdi->reset_gpio, 1);
 279
 280         gpiod_set_value(jdi->dcdc_en_gpio, 0);
 281
 282         return ret;
 283 }
 284
 285 static int jdi_panel_enable(struct drm_panel *panel)
 286 {
 287         struct jdi_panel *jdi = to_jdi_panel(panel);
 288
 289         if (jdi->enabled)
 290                 return 0;
 291
 292         jdi->backlight->props.power = FB_BLANK_UNBLANK;
 293         backlight_update_status(jdi->backlight);
 294
 295         jdi->enabled = true;
 296
 297         return 0;
 298 }
 299
 300 static const struct drm_display_mode default_mode = {
 301                 .clock = 155493,
 302                 .hdisplay = 1200,
 303                 .hsync_start = 1200 + 48,
 304                 .hsync_end = 1200 + 48 + 32,
 305                 .htotal = 1200 + 48 + 32 + 60,
 306                 .vdisplay = 1920,
 307                 .vsync_start = 1920 + 3,
 308                 .vsync_end = 1920 + 3 + 5,
 309                 .vtotal = 1920 + 3 + 5 + 6,
 310                 .vrefresh = 60,
 311                 .flags = 0,
 312 };
 313
 314 static int jdi_panel_get_modes(struct drm_panel *panel)
 315 {
 316         struct drm_display_mode *mode;
 317         struct jdi_panel *jdi = to_jdi_panel(panel);
 318         struct device *dev = &jdi->dsi->dev;
 319
 320         mode = drm_mode_duplicate(panel->drm, &default_mode);
 321         if (!mode) {
 322                 dev_err(dev, "failed to add mode %ux%ux@%u\n",
 323                         default_mode.hdisplay, default_mode.vdisplay,
 324                         default_mode.vrefresh);
 325                 return -ENOMEM;
 326         }
 327
 328         drm_mode_set_name(mode);
 329
 330         drm_mode_probed_add(panel->connector, mode);
 331
 332         panel->connector->display_info.width_mm = 95;
 333         panel->connector->display_info.height_mm = 151;
 334
 335         return 1;
 336 }
 337
 338 static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
 339 {
 340         struct mipi_dsi_device *dsi = bl_get_data(bl);
 341         int ret;
 342         u16 brightness = bl->props.brightness;
 343
 344         dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
 345
 346         ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
 347         if (ret < 0)
 348                 return ret;
 349
 350         dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 351
 352         return brightness & 0xff;
 353 }
 354
 355 static int dsi_dcs_bl_update_status(struct backlight_device *bl)
 356 {
 357         struct mipi_dsi_device *dsi = bl_get_data(bl);
 358         int ret;
 359
 360         dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
 361
 362         ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
 363         if (ret < 0)
 364                 return ret;
 365
 366         dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 367
 368         return 0;
 369 }
 370
 371 static const struct backlight_ops dsi_bl_ops = {
 372         .update_status = dsi_dcs_bl_update_status,
 373         .get_brightness = dsi_dcs_bl_get_brightness,
 374 };
 375
 376 static struct backlight_device *
 377 drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
 378 {
 379         struct device *dev = &dsi->dev;
 380         struct backlight_properties props;
 381
 382         memset(&props, 0, sizeof(props));
 383         props.type = BACKLIGHT_RAW;
 384         props.brightness = 255;
 385         props.max_brightness = 255;
 386
 387         return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
 388                                               &dsi_bl_ops, &props);
 389 }
 390
 391 static const struct drm_panel_funcs jdi_panel_funcs = {
 392         .disable = jdi_panel_disable,
 393         .unprepare = jdi_panel_unprepare,
 394         .prepare = jdi_panel_prepare,
 395         .enable = jdi_panel_enable,
 396         .get_modes = jdi_panel_get_modes,
 397 };
 398
 399 static const struct of_device_id jdi_of_match[] = {
 400         { .compatible = "jdi,lt070me05000", },
 401         { }
 402 };
 403 MODULE_DEVICE_TABLE(of, jdi_of_match);
 404
 405 static int jdi_panel_add(struct jdi_panel *jdi)
 406 {
 407         struct device *dev = &jdi->dsi->dev;
 408         int ret;
 409         unsigned int i;
 410
 411         jdi->mode = &default_mode;
 412
 413         for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
 414                 jdi->supplies[i].supply = regulator_names[i];
 415
 416         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
 417                                       jdi->supplies);
 418         if (ret < 0) {
 419                 dev_err(dev, "failed to init regulator, ret=%d\n", ret);
 420                 return ret;
 421         }
 422
 423         jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
 424         if (IS_ERR(jdi->enable_gpio)) {
 425                 ret = PTR_ERR(jdi->enable_gpio);
 426                 dev_err(dev, "cannot get enable-gpio %d\n", ret);
 427                 return ret;
 428         }
 429
 430         jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 431         if (IS_ERR(jdi->reset_gpio)) {
 432                 ret = PTR_ERR(jdi->reset_gpio);
 433                 dev_err(dev, "cannot get reset-gpios %d\n", ret);
 434                 return ret;
 435         }
 436
 437         jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
 438         if (IS_ERR(jdi->dcdc_en_gpio)) {
 439                 ret = PTR_ERR(jdi->dcdc_en_gpio);
 440                 dev_err(dev, "cannot get dcdc-en-gpio %d\n", ret);
 441                 return ret;
 442         }
 443
 444         jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
 445         if (IS_ERR(jdi->backlight)) {
 446                 ret = PTR_ERR(jdi->backlight);
 447                 dev_err(dev, "failed to register backlight %d\n", ret);
 448                 return ret;
 449         }
 450
 451         drm_panel_init(&jdi->base);
 452         jdi->base.funcs = &jdi_panel_funcs;
 453         jdi->base.dev = &jdi->dsi->dev;
 454
 455         ret = drm_panel_add(&jdi->base);
 456
 457         return ret;
 458 }
 459
 460 static void jdi_panel_del(struct jdi_panel *jdi)
 461 {
 462         if (jdi->base.dev)
 463                 drm_panel_remove(&jdi->base);
 464 }
 465
 466 static int jdi_panel_probe(struct mipi_dsi_device *dsi)
 467 {
 468         struct jdi_panel *jdi;
 469         int ret;
 470
 471         dsi->lanes = 4;
 472         dsi->format = MIPI_DSI_FMT_RGB888;
 473         dsi->mode_flags =  MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
 474                            MIPI_DSI_CLOCK_NON_CONTINUOUS;
 475
 476         jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
 477         if (!jdi)
 478                 return -ENOMEM;
 479
 480         mipi_dsi_set_drvdata(dsi, jdi);
 481
 482         jdi->dsi = dsi;
 483
 484         ret = jdi_panel_add(jdi);
 485         if (ret < 0)
 486                 return ret;
 487
 488         return mipi_dsi_attach(dsi);
 489 }
 490
 491 static int jdi_panel_remove(struct mipi_dsi_device *dsi)
 492 {
 493         struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
 494         int ret;
 495
 496         ret = jdi_panel_disable(&jdi->base);
 497         if (ret < 0)
 498                 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
 499
 500         ret = mipi_dsi_detach(dsi);
 501         if (ret < 0)
 502                 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
 503                         ret);
 504
 505         drm_panel_detach(&jdi->base);
 506         jdi_panel_del(jdi);
 507
 508         return 0;
 509 }
 510
 511 static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
 512 {
 513         struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
 514
 515         jdi_panel_disable(&jdi->base);
 516 }
 517
 518 static struct mipi_dsi_driver jdi_panel_driver = {
 519         .driver = {
 520                 .name = "panel-jdi-lt070me05000",
 521                 .of_match_table = jdi_of_match,
 522         },
 523         .probe = jdi_panel_probe,
 524         .remove = jdi_panel_remove,
 525         .shutdown = jdi_panel_shutdown,
 526 };
 527 module_mipi_dsi_driver(jdi_panel_driver);
 528
 529 MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
 530 MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
 531 MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
 532 MODULE_LICENSE("GPL v2");