1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2016 InforceComputing 4 * Author: Vinay Simha BN <simhavcs@gmail.com> 5 * 6 * Copyright (C) 2016 Linaro Ltd 7 * Author: Sumit Semwal <sumit.semwal@linaro.org> 8 */ 9 10 #include <linux/backlight.h> 11 #include <linux/delay.h> 12 #include <linux/gpio/consumer.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/regulator/consumer.h> 16 17 #include <video/mipi_display.h> 18 19 #include <drm/drm_crtc.h> 20 #include <drm/drm_mipi_dsi.h> 21 #include <drm/drm_modes.h> 22 #include <drm/drm_panel.h> 23 24 static const char * const regulator_names[] = { 25 "vddp", 26 "iovcc" 27 }; 28 29 struct jdi_panel { 30 struct drm_panel base; 31 struct mipi_dsi_device *dsi; 32 33 struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)]; 34 35 struct gpio_desc *enable_gpio; 36 struct gpio_desc *reset_gpio; 37 struct gpio_desc *dcdc_en_gpio; 38 struct backlight_device *backlight; 39 40 const struct drm_display_mode *mode; 41 }; 42 43 static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel) 44 { 45 return container_of(panel, struct jdi_panel, base); 46 } 47 48 static int jdi_panel_init(struct jdi_panel *jdi) 49 { 50 struct mipi_dsi_device *dsi = jdi->dsi; 51 struct device *dev = &jdi->dsi->dev; 52 int ret; 53 54 dsi->mode_flags |= MIPI_DSI_MODE_LPM; 55 56 ret = mipi_dsi_dcs_soft_reset(dsi); 57 if (ret < 0) 58 return ret; 59 60 usleep_range(10000, 20000); 61 62 ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4); 63 if (ret < 0) { 64 dev_err(dev, "failed to set pixel format: %d\n", ret); 65 return ret; 66 } 67 68 ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1); 69 if (ret < 0) { 70 dev_err(dev, "failed to set column address: %d\n", ret); 71 return ret; 72 } 73 74 ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1); 75 if (ret < 0) { 76 dev_err(dev, "failed to set page address: %d\n", ret); 77 return ret; 78 } 79 80 /* 81 * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers 82 * are active 83 * BIT(3) BL = 1 Backlight Control On 84 * BIT(2) DD = 0 Display Dimming is Off 85 */ 86 ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 87 (u8[]){ 0x24 }, 1); 88 if (ret < 0) { 89 dev_err(dev, "failed to write control display: %d\n", ret); 90 return ret; 91 } 92 93 /* CABC off */ 94 ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE, 95 (u8[]){ 0x00 }, 1); 96 if (ret < 0) { 97 dev_err(dev, "failed to set cabc off: %d\n", ret); 98 return ret; 99 } 100 101 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 102 if (ret < 0) { 103 dev_err(dev, "failed to set exit sleep mode: %d\n", ret); 104 return ret; 105 } 106 107 msleep(120); 108 109 ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2); 110 if (ret < 0) { 111 dev_err(dev, "failed to set mcap: %d\n", ret); 112 return ret; 113 } 114 115 mdelay(10); 116 117 /* Interface setting, video mode */ 118 ret = mipi_dsi_generic_write(dsi, (u8[]) 119 {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6); 120 if (ret < 0) { 121 dev_err(dev, "failed to set display interface setting: %d\n" 122 , ret); 123 return ret; 124 } 125 126 mdelay(20); 127 128 ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2); 129 if (ret < 0) { 130 dev_err(dev, "failed to set default values for mcap: %d\n" 131 , ret); 132 return ret; 133 } 134 135 return 0; 136 } 137 138 static int jdi_panel_on(struct jdi_panel *jdi) 139 { 140 struct mipi_dsi_device *dsi = jdi->dsi; 141 struct device *dev = &jdi->dsi->dev; 142 int ret; 143 144 dsi->mode_flags |= MIPI_DSI_MODE_LPM; 145 146 ret = mipi_dsi_dcs_set_display_on(dsi); 147 if (ret < 0) 148 dev_err(dev, "failed to set display on: %d\n", ret); 149 150 return ret; 151 } 152 153 static void jdi_panel_off(struct jdi_panel *jdi) 154 { 155 struct mipi_dsi_device *dsi = jdi->dsi; 156 struct device *dev = &jdi->dsi->dev; 157 int ret; 158 159 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM; 160 161 ret = mipi_dsi_dcs_set_display_off(dsi); 162 if (ret < 0) 163 dev_err(dev, "failed to set display off: %d\n", ret); 164 165 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 166 if (ret < 0) 167 dev_err(dev, "failed to enter sleep mode: %d\n", ret); 168 169 msleep(100); 170 } 171 172 static int jdi_panel_disable(struct drm_panel *panel) 173 { 174 struct jdi_panel *jdi = to_jdi_panel(panel); 175 176 backlight_disable(jdi->backlight); 177 178 return 0; 179 } 180 181 static int jdi_panel_unprepare(struct drm_panel *panel) 182 { 183 struct jdi_panel *jdi = to_jdi_panel(panel); 184 struct device *dev = &jdi->dsi->dev; 185 int ret; 186 187 jdi_panel_off(jdi); 188 189 ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies); 190 if (ret < 0) 191 dev_err(dev, "regulator disable failed, %d\n", ret); 192 193 gpiod_set_value(jdi->enable_gpio, 0); 194 195 gpiod_set_value(jdi->reset_gpio, 1); 196 197 gpiod_set_value(jdi->dcdc_en_gpio, 0); 198 199 return 0; 200 } 201 202 static int jdi_panel_prepare(struct drm_panel *panel) 203 { 204 struct jdi_panel *jdi = to_jdi_panel(panel); 205 struct device *dev = &jdi->dsi->dev; 206 int ret; 207 208 ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies); 209 if (ret < 0) { 210 dev_err(dev, "regulator enable failed, %d\n", ret); 211 return ret; 212 } 213 214 msleep(20); 215 216 gpiod_set_value(jdi->dcdc_en_gpio, 1); 217 usleep_range(10, 20); 218 219 gpiod_set_value(jdi->reset_gpio, 0); 220 usleep_range(10, 20); 221 222 gpiod_set_value(jdi->enable_gpio, 1); 223 usleep_range(10, 20); 224 225 ret = jdi_panel_init(jdi); 226 if (ret < 0) { 227 dev_err(dev, "failed to init panel: %d\n", ret); 228 goto poweroff; 229 } 230 231 ret = jdi_panel_on(jdi); 232 if (ret < 0) { 233 dev_err(dev, "failed to set panel on: %d\n", ret); 234 goto poweroff; 235 } 236 237 return 0; 238 239 poweroff: 240 ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies); 241 if (ret < 0) 242 dev_err(dev, "regulator disable failed, %d\n", ret); 243 244 gpiod_set_value(jdi->enable_gpio, 0); 245 246 gpiod_set_value(jdi->reset_gpio, 1); 247 248 gpiod_set_value(jdi->dcdc_en_gpio, 0); 249 250 return ret; 251 } 252 253 static int jdi_panel_enable(struct drm_panel *panel) 254 { 255 struct jdi_panel *jdi = to_jdi_panel(panel); 256 257 backlight_enable(jdi->backlight); 258 259 return 0; 260 } 261 262 static const struct drm_display_mode default_mode = { 263 .clock = 155493, 264 .hdisplay = 1200, 265 .hsync_start = 1200 + 48, 266 .hsync_end = 1200 + 48 + 32, 267 .htotal = 1200 + 48 + 32 + 60, 268 .vdisplay = 1920, 269 .vsync_start = 1920 + 3, 270 .vsync_end = 1920 + 3 + 5, 271 .vtotal = 1920 + 3 + 5 + 6, 272 .flags = 0, 273 }; 274 275 static int jdi_panel_get_modes(struct drm_panel *panel, 276 struct drm_connector *connector) 277 { 278 struct drm_display_mode *mode; 279 struct jdi_panel *jdi = to_jdi_panel(panel); 280 struct device *dev = &jdi->dsi->dev; 281 282 mode = drm_mode_duplicate(connector->dev, &default_mode); 283 if (!mode) { 284 dev_err(dev, "failed to add mode %ux%ux@%u\n", 285 default_mode.hdisplay, default_mode.vdisplay, 286 drm_mode_vrefresh(&default_mode)); 287 return -ENOMEM; 288 } 289 290 drm_mode_set_name(mode); 291 292 drm_mode_probed_add(connector, mode); 293 294 connector->display_info.width_mm = 95; 295 connector->display_info.height_mm = 151; 296 297 return 1; 298 } 299 300 static int dsi_dcs_bl_get_brightness(struct backlight_device *bl) 301 { 302 struct mipi_dsi_device *dsi = bl_get_data(bl); 303 int ret; 304 u16 brightness = bl->props.brightness; 305 306 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM; 307 308 ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness); 309 if (ret < 0) 310 return ret; 311 312 dsi->mode_flags |= MIPI_DSI_MODE_LPM; 313 314 return brightness & 0xff; 315 } 316 317 static int dsi_dcs_bl_update_status(struct backlight_device *bl) 318 { 319 struct mipi_dsi_device *dsi = bl_get_data(bl); 320 int ret; 321 322 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM; 323 324 ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness); 325 if (ret < 0) 326 return ret; 327 328 dsi->mode_flags |= MIPI_DSI_MODE_LPM; 329 330 return 0; 331 } 332 333 static const struct backlight_ops dsi_bl_ops = { 334 .update_status = dsi_dcs_bl_update_status, 335 .get_brightness = dsi_dcs_bl_get_brightness, 336 }; 337 338 static struct backlight_device * 339 drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi) 340 { 341 struct device *dev = &dsi->dev; 342 struct backlight_properties props; 343 344 memset(&props, 0, sizeof(props)); 345 props.type = BACKLIGHT_RAW; 346 props.brightness = 255; 347 props.max_brightness = 255; 348 349 return devm_backlight_device_register(dev, dev_name(dev), dev, dsi, 350 &dsi_bl_ops, &props); 351 } 352 353 static const struct drm_panel_funcs jdi_panel_funcs = { 354 .disable = jdi_panel_disable, 355 .unprepare = jdi_panel_unprepare, 356 .prepare = jdi_panel_prepare, 357 .enable = jdi_panel_enable, 358 .get_modes = jdi_panel_get_modes, 359 }; 360 361 static const struct of_device_id jdi_of_match[] = { 362 { .compatible = "jdi,lt070me05000", }, 363 { } 364 }; 365 MODULE_DEVICE_TABLE(of, jdi_of_match); 366 367 static int jdi_panel_add(struct jdi_panel *jdi) 368 { 369 struct device *dev = &jdi->dsi->dev; 370 int ret; 371 unsigned int i; 372 373 jdi->mode = &default_mode; 374 375 for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++) 376 jdi->supplies[i].supply = regulator_names[i]; 377 378 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies), 379 jdi->supplies); 380 if (ret < 0) 381 return dev_err_probe(dev, ret, 382 "failed to init regulator, ret=%d\n", ret); 383 384 jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); 385 if (IS_ERR(jdi->enable_gpio)) { 386 return dev_err_probe(dev, PTR_ERR(jdi->enable_gpio), 387 "cannot get enable-gpio %d\n", ret); 388 } 389 390 jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 391 if (IS_ERR(jdi->reset_gpio)) 392 return dev_err_probe(dev, PTR_ERR(jdi->reset_gpio), 393 "cannot get reset-gpios %d\n", ret); 394 395 jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW); 396 if (IS_ERR(jdi->dcdc_en_gpio)) 397 return dev_err_probe(dev, PTR_ERR(jdi->dcdc_en_gpio), 398 "cannot get dcdc-en-gpio %d\n", ret); 399 400 jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi); 401 if (IS_ERR(jdi->backlight)) 402 return dev_err_probe(dev, PTR_ERR(jdi->backlight), 403 "failed to register backlight %d\n", ret); 404 405 drm_panel_init(&jdi->base, &jdi->dsi->dev, &jdi_panel_funcs, 406 DRM_MODE_CONNECTOR_DSI); 407 408 drm_panel_add(&jdi->base); 409 410 return 0; 411 } 412 413 static void jdi_panel_del(struct jdi_panel *jdi) 414 { 415 if (jdi->base.dev) 416 drm_panel_remove(&jdi->base); 417 } 418 419 static int jdi_panel_probe(struct mipi_dsi_device *dsi) 420 { 421 struct jdi_panel *jdi; 422 int ret; 423 424 dsi->lanes = 4; 425 dsi->format = MIPI_DSI_FMT_RGB888; 426 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO | 427 MIPI_DSI_CLOCK_NON_CONTINUOUS; 428 429 jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL); 430 if (!jdi) 431 return -ENOMEM; 432 433 mipi_dsi_set_drvdata(dsi, jdi); 434 435 jdi->dsi = dsi; 436 437 ret = jdi_panel_add(jdi); 438 if (ret < 0) 439 return ret; 440 441 ret = mipi_dsi_attach(dsi); 442 if (ret < 0) { 443 jdi_panel_del(jdi); 444 return ret; 445 } 446 447 return 0; 448 } 449 450 static void jdi_panel_remove(struct mipi_dsi_device *dsi) 451 { 452 struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi); 453 int ret; 454 455 ret = mipi_dsi_detach(dsi); 456 if (ret < 0) 457 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", 458 ret); 459 460 jdi_panel_del(jdi); 461 } 462 463 static struct mipi_dsi_driver jdi_panel_driver = { 464 .driver = { 465 .name = "panel-jdi-lt070me05000", 466 .of_match_table = jdi_of_match, 467 }, 468 .probe = jdi_panel_probe, 469 .remove = jdi_panel_remove, 470 }; 471 module_mipi_dsi_driver(jdi_panel_driver); 472 473 MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>"); 474 MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>"); 475 MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA"); 476 MODULE_LICENSE("GPL v2"); 477