1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2017-2018, Bootlin 4 */ 5 6 #include <linux/delay.h> 7 #include <linux/device.h> 8 #include <linux/err.h> 9 #include <linux/errno.h> 10 #include <linux/fb.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 14 #include <linux/gpio/consumer.h> 15 #include <linux/regulator/consumer.h> 16 17 #include <drm/drm_mipi_dsi.h> 18 #include <drm/drm_modes.h> 19 #include <drm/drm_panel.h> 20 21 #include <video/mipi_display.h> 22 23 struct ili9881c { 24 struct drm_panel panel; 25 struct mipi_dsi_device *dsi; 26 27 struct regulator *power; 28 struct gpio_desc *reset; 29 }; 30 31 enum ili9881c_op { 32 ILI9881C_SWITCH_PAGE, 33 ILI9881C_COMMAND, 34 }; 35 36 struct ili9881c_instr { 37 enum ili9881c_op op; 38 39 union arg { 40 struct cmd { 41 u8 cmd; 42 u8 data; 43 } cmd; 44 u8 page; 45 } arg; 46 }; 47 48 #define ILI9881C_SWITCH_PAGE_INSTR(_page) \ 49 { \ 50 .op = ILI9881C_SWITCH_PAGE, \ 51 .arg = { \ 52 .page = (_page), \ 53 }, \ 54 } 55 56 #define ILI9881C_COMMAND_INSTR(_cmd, _data) \ 57 { \ 58 .op = ILI9881C_COMMAND, \ 59 .arg = { \ 60 .cmd = { \ 61 .cmd = (_cmd), \ 62 .data = (_data), \ 63 }, \ 64 }, \ 65 } 66 67 static const struct ili9881c_instr ili9881c_init[] = { 68 ILI9881C_SWITCH_PAGE_INSTR(3), 69 ILI9881C_COMMAND_INSTR(0x01, 0x00), 70 ILI9881C_COMMAND_INSTR(0x02, 0x00), 71 ILI9881C_COMMAND_INSTR(0x03, 0x73), 72 ILI9881C_COMMAND_INSTR(0x04, 0x03), 73 ILI9881C_COMMAND_INSTR(0x05, 0x00), 74 ILI9881C_COMMAND_INSTR(0x06, 0x06), 75 ILI9881C_COMMAND_INSTR(0x07, 0x06), 76 ILI9881C_COMMAND_INSTR(0x08, 0x00), 77 ILI9881C_COMMAND_INSTR(0x09, 0x18), 78 ILI9881C_COMMAND_INSTR(0x0a, 0x04), 79 ILI9881C_COMMAND_INSTR(0x0b, 0x00), 80 ILI9881C_COMMAND_INSTR(0x0c, 0x02), 81 ILI9881C_COMMAND_INSTR(0x0d, 0x03), 82 ILI9881C_COMMAND_INSTR(0x0e, 0x00), 83 ILI9881C_COMMAND_INSTR(0x0f, 0x25), 84 ILI9881C_COMMAND_INSTR(0x10, 0x25), 85 ILI9881C_COMMAND_INSTR(0x11, 0x00), 86 ILI9881C_COMMAND_INSTR(0x12, 0x00), 87 ILI9881C_COMMAND_INSTR(0x13, 0x00), 88 ILI9881C_COMMAND_INSTR(0x14, 0x00), 89 ILI9881C_COMMAND_INSTR(0x15, 0x00), 90 ILI9881C_COMMAND_INSTR(0x16, 0x0C), 91 ILI9881C_COMMAND_INSTR(0x17, 0x00), 92 ILI9881C_COMMAND_INSTR(0x18, 0x00), 93 ILI9881C_COMMAND_INSTR(0x19, 0x00), 94 ILI9881C_COMMAND_INSTR(0x1a, 0x00), 95 ILI9881C_COMMAND_INSTR(0x1b, 0x00), 96 ILI9881C_COMMAND_INSTR(0x1c, 0x00), 97 ILI9881C_COMMAND_INSTR(0x1d, 0x00), 98 ILI9881C_COMMAND_INSTR(0x1e, 0xC0), 99 ILI9881C_COMMAND_INSTR(0x1f, 0x80), 100 ILI9881C_COMMAND_INSTR(0x20, 0x04), 101 ILI9881C_COMMAND_INSTR(0x21, 0x01), 102 ILI9881C_COMMAND_INSTR(0x22, 0x00), 103 ILI9881C_COMMAND_INSTR(0x23, 0x00), 104 ILI9881C_COMMAND_INSTR(0x24, 0x00), 105 ILI9881C_COMMAND_INSTR(0x25, 0x00), 106 ILI9881C_COMMAND_INSTR(0x26, 0x00), 107 ILI9881C_COMMAND_INSTR(0x27, 0x00), 108 ILI9881C_COMMAND_INSTR(0x28, 0x33), 109 ILI9881C_COMMAND_INSTR(0x29, 0x03), 110 ILI9881C_COMMAND_INSTR(0x2a, 0x00), 111 ILI9881C_COMMAND_INSTR(0x2b, 0x00), 112 ILI9881C_COMMAND_INSTR(0x2c, 0x00), 113 ILI9881C_COMMAND_INSTR(0x2d, 0x00), 114 ILI9881C_COMMAND_INSTR(0x2e, 0x00), 115 ILI9881C_COMMAND_INSTR(0x2f, 0x00), 116 ILI9881C_COMMAND_INSTR(0x30, 0x00), 117 ILI9881C_COMMAND_INSTR(0x31, 0x00), 118 ILI9881C_COMMAND_INSTR(0x32, 0x00), 119 ILI9881C_COMMAND_INSTR(0x33, 0x00), 120 ILI9881C_COMMAND_INSTR(0x34, 0x04), 121 ILI9881C_COMMAND_INSTR(0x35, 0x00), 122 ILI9881C_COMMAND_INSTR(0x36, 0x00), 123 ILI9881C_COMMAND_INSTR(0x37, 0x00), 124 ILI9881C_COMMAND_INSTR(0x38, 0x3C), 125 ILI9881C_COMMAND_INSTR(0x39, 0x00), 126 ILI9881C_COMMAND_INSTR(0x3a, 0x00), 127 ILI9881C_COMMAND_INSTR(0x3b, 0x00), 128 ILI9881C_COMMAND_INSTR(0x3c, 0x00), 129 ILI9881C_COMMAND_INSTR(0x3d, 0x00), 130 ILI9881C_COMMAND_INSTR(0x3e, 0x00), 131 ILI9881C_COMMAND_INSTR(0x3f, 0x00), 132 ILI9881C_COMMAND_INSTR(0x40, 0x00), 133 ILI9881C_COMMAND_INSTR(0x41, 0x00), 134 ILI9881C_COMMAND_INSTR(0x42, 0x00), 135 ILI9881C_COMMAND_INSTR(0x43, 0x00), 136 ILI9881C_COMMAND_INSTR(0x44, 0x00), 137 ILI9881C_COMMAND_INSTR(0x50, 0x01), 138 ILI9881C_COMMAND_INSTR(0x51, 0x23), 139 ILI9881C_COMMAND_INSTR(0x52, 0x45), 140 ILI9881C_COMMAND_INSTR(0x53, 0x67), 141 ILI9881C_COMMAND_INSTR(0x54, 0x89), 142 ILI9881C_COMMAND_INSTR(0x55, 0xab), 143 ILI9881C_COMMAND_INSTR(0x56, 0x01), 144 ILI9881C_COMMAND_INSTR(0x57, 0x23), 145 ILI9881C_COMMAND_INSTR(0x58, 0x45), 146 ILI9881C_COMMAND_INSTR(0x59, 0x67), 147 ILI9881C_COMMAND_INSTR(0x5a, 0x89), 148 ILI9881C_COMMAND_INSTR(0x5b, 0xab), 149 ILI9881C_COMMAND_INSTR(0x5c, 0xcd), 150 ILI9881C_COMMAND_INSTR(0x5d, 0xef), 151 ILI9881C_COMMAND_INSTR(0x5e, 0x11), 152 ILI9881C_COMMAND_INSTR(0x5f, 0x02), 153 ILI9881C_COMMAND_INSTR(0x60, 0x02), 154 ILI9881C_COMMAND_INSTR(0x61, 0x02), 155 ILI9881C_COMMAND_INSTR(0x62, 0x02), 156 ILI9881C_COMMAND_INSTR(0x63, 0x02), 157 ILI9881C_COMMAND_INSTR(0x64, 0x02), 158 ILI9881C_COMMAND_INSTR(0x65, 0x02), 159 ILI9881C_COMMAND_INSTR(0x66, 0x02), 160 ILI9881C_COMMAND_INSTR(0x67, 0x02), 161 ILI9881C_COMMAND_INSTR(0x68, 0x02), 162 ILI9881C_COMMAND_INSTR(0x69, 0x02), 163 ILI9881C_COMMAND_INSTR(0x6a, 0x0C), 164 ILI9881C_COMMAND_INSTR(0x6b, 0x02), 165 ILI9881C_COMMAND_INSTR(0x6c, 0x0F), 166 ILI9881C_COMMAND_INSTR(0x6d, 0x0E), 167 ILI9881C_COMMAND_INSTR(0x6e, 0x0D), 168 ILI9881C_COMMAND_INSTR(0x6f, 0x06), 169 ILI9881C_COMMAND_INSTR(0x70, 0x07), 170 ILI9881C_COMMAND_INSTR(0x71, 0x02), 171 ILI9881C_COMMAND_INSTR(0x72, 0x02), 172 ILI9881C_COMMAND_INSTR(0x73, 0x02), 173 ILI9881C_COMMAND_INSTR(0x74, 0x02), 174 ILI9881C_COMMAND_INSTR(0x75, 0x02), 175 ILI9881C_COMMAND_INSTR(0x76, 0x02), 176 ILI9881C_COMMAND_INSTR(0x77, 0x02), 177 ILI9881C_COMMAND_INSTR(0x78, 0x02), 178 ILI9881C_COMMAND_INSTR(0x79, 0x02), 179 ILI9881C_COMMAND_INSTR(0x7a, 0x02), 180 ILI9881C_COMMAND_INSTR(0x7b, 0x02), 181 ILI9881C_COMMAND_INSTR(0x7c, 0x02), 182 ILI9881C_COMMAND_INSTR(0x7d, 0x02), 183 ILI9881C_COMMAND_INSTR(0x7e, 0x02), 184 ILI9881C_COMMAND_INSTR(0x7f, 0x02), 185 ILI9881C_COMMAND_INSTR(0x80, 0x0C), 186 ILI9881C_COMMAND_INSTR(0x81, 0x02), 187 ILI9881C_COMMAND_INSTR(0x82, 0x0F), 188 ILI9881C_COMMAND_INSTR(0x83, 0x0E), 189 ILI9881C_COMMAND_INSTR(0x84, 0x0D), 190 ILI9881C_COMMAND_INSTR(0x85, 0x06), 191 ILI9881C_COMMAND_INSTR(0x86, 0x07), 192 ILI9881C_COMMAND_INSTR(0x87, 0x02), 193 ILI9881C_COMMAND_INSTR(0x88, 0x02), 194 ILI9881C_COMMAND_INSTR(0x89, 0x02), 195 ILI9881C_COMMAND_INSTR(0x8A, 0x02), 196 ILI9881C_SWITCH_PAGE_INSTR(4), 197 ILI9881C_COMMAND_INSTR(0x6C, 0x15), 198 ILI9881C_COMMAND_INSTR(0x6E, 0x22), 199 ILI9881C_COMMAND_INSTR(0x6F, 0x33), 200 ILI9881C_COMMAND_INSTR(0x3A, 0xA4), 201 ILI9881C_COMMAND_INSTR(0x8D, 0x0D), 202 ILI9881C_COMMAND_INSTR(0x87, 0xBA), 203 ILI9881C_COMMAND_INSTR(0x26, 0x76), 204 ILI9881C_COMMAND_INSTR(0xB2, 0xD1), 205 ILI9881C_SWITCH_PAGE_INSTR(1), 206 ILI9881C_COMMAND_INSTR(0x22, 0x0A), 207 ILI9881C_COMMAND_INSTR(0x53, 0xDC), 208 ILI9881C_COMMAND_INSTR(0x55, 0xA7), 209 ILI9881C_COMMAND_INSTR(0x50, 0x78), 210 ILI9881C_COMMAND_INSTR(0x51, 0x78), 211 ILI9881C_COMMAND_INSTR(0x31, 0x02), 212 ILI9881C_COMMAND_INSTR(0x60, 0x14), 213 ILI9881C_COMMAND_INSTR(0xA0, 0x2A), 214 ILI9881C_COMMAND_INSTR(0xA1, 0x39), 215 ILI9881C_COMMAND_INSTR(0xA2, 0x46), 216 ILI9881C_COMMAND_INSTR(0xA3, 0x0e), 217 ILI9881C_COMMAND_INSTR(0xA4, 0x12), 218 ILI9881C_COMMAND_INSTR(0xA5, 0x25), 219 ILI9881C_COMMAND_INSTR(0xA6, 0x19), 220 ILI9881C_COMMAND_INSTR(0xA7, 0x1d), 221 ILI9881C_COMMAND_INSTR(0xA8, 0xa6), 222 ILI9881C_COMMAND_INSTR(0xA9, 0x1C), 223 ILI9881C_COMMAND_INSTR(0xAA, 0x29), 224 ILI9881C_COMMAND_INSTR(0xAB, 0x85), 225 ILI9881C_COMMAND_INSTR(0xAC, 0x1C), 226 ILI9881C_COMMAND_INSTR(0xAD, 0x1B), 227 ILI9881C_COMMAND_INSTR(0xAE, 0x51), 228 ILI9881C_COMMAND_INSTR(0xAF, 0x22), 229 ILI9881C_COMMAND_INSTR(0xB0, 0x2d), 230 ILI9881C_COMMAND_INSTR(0xB1, 0x4f), 231 ILI9881C_COMMAND_INSTR(0xB2, 0x59), 232 ILI9881C_COMMAND_INSTR(0xB3, 0x3F), 233 ILI9881C_COMMAND_INSTR(0xC0, 0x2A), 234 ILI9881C_COMMAND_INSTR(0xC1, 0x3a), 235 ILI9881C_COMMAND_INSTR(0xC2, 0x45), 236 ILI9881C_COMMAND_INSTR(0xC3, 0x0e), 237 ILI9881C_COMMAND_INSTR(0xC4, 0x11), 238 ILI9881C_COMMAND_INSTR(0xC5, 0x24), 239 ILI9881C_COMMAND_INSTR(0xC6, 0x1a), 240 ILI9881C_COMMAND_INSTR(0xC7, 0x1c), 241 ILI9881C_COMMAND_INSTR(0xC8, 0xaa), 242 ILI9881C_COMMAND_INSTR(0xC9, 0x1C), 243 ILI9881C_COMMAND_INSTR(0xCA, 0x29), 244 ILI9881C_COMMAND_INSTR(0xCB, 0x96), 245 ILI9881C_COMMAND_INSTR(0xCC, 0x1C), 246 ILI9881C_COMMAND_INSTR(0xCD, 0x1B), 247 ILI9881C_COMMAND_INSTR(0xCE, 0x51), 248 ILI9881C_COMMAND_INSTR(0xCF, 0x22), 249 ILI9881C_COMMAND_INSTR(0xD0, 0x2b), 250 ILI9881C_COMMAND_INSTR(0xD1, 0x4b), 251 ILI9881C_COMMAND_INSTR(0xD2, 0x59), 252 ILI9881C_COMMAND_INSTR(0xD3, 0x3F), 253 }; 254 255 static inline struct ili9881c *panel_to_ili9881c(struct drm_panel *panel) 256 { 257 return container_of(panel, struct ili9881c, panel); 258 } 259 260 /* 261 * The panel seems to accept some private DCS commands that map 262 * directly to registers. 263 * 264 * It is organised by page, with each page having its own set of 265 * registers, and the first page looks like it's holding the standard 266 * DCS commands. 267 * 268 * So before any attempt at sending a command or data, we have to be 269 * sure if we're in the right page or not. 270 */ 271 static int ili9881c_switch_page(struct ili9881c *ctx, u8 page) 272 { 273 u8 buf[4] = { 0xff, 0x98, 0x81, page }; 274 int ret; 275 276 ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf)); 277 if (ret < 0) 278 return ret; 279 280 return 0; 281 } 282 283 static int ili9881c_send_cmd_data(struct ili9881c *ctx, u8 cmd, u8 data) 284 { 285 u8 buf[2] = { cmd, data }; 286 int ret; 287 288 ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf)); 289 if (ret < 0) 290 return ret; 291 292 return 0; 293 } 294 295 static int ili9881c_prepare(struct drm_panel *panel) 296 { 297 struct ili9881c *ctx = panel_to_ili9881c(panel); 298 unsigned int i; 299 int ret; 300 301 /* Power the panel */ 302 ret = regulator_enable(ctx->power); 303 if (ret) 304 return ret; 305 msleep(5); 306 307 /* And reset it */ 308 gpiod_set_value(ctx->reset, 1); 309 msleep(20); 310 311 gpiod_set_value(ctx->reset, 0); 312 msleep(20); 313 314 for (i = 0; i < ARRAY_SIZE(ili9881c_init); i++) { 315 const struct ili9881c_instr *instr = &ili9881c_init[i]; 316 317 if (instr->op == ILI9881C_SWITCH_PAGE) 318 ret = ili9881c_switch_page(ctx, instr->arg.page); 319 else if (instr->op == ILI9881C_COMMAND) 320 ret = ili9881c_send_cmd_data(ctx, instr->arg.cmd.cmd, 321 instr->arg.cmd.data); 322 323 if (ret) 324 return ret; 325 } 326 327 ret = ili9881c_switch_page(ctx, 0); 328 if (ret) 329 return ret; 330 331 ret = mipi_dsi_dcs_set_tear_on(ctx->dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK); 332 if (ret) 333 return ret; 334 335 ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi); 336 if (ret) 337 return ret; 338 339 return 0; 340 } 341 342 static int ili9881c_enable(struct drm_panel *panel) 343 { 344 struct ili9881c *ctx = panel_to_ili9881c(panel); 345 346 msleep(120); 347 348 mipi_dsi_dcs_set_display_on(ctx->dsi); 349 350 return 0; 351 } 352 353 static int ili9881c_disable(struct drm_panel *panel) 354 { 355 struct ili9881c *ctx = panel_to_ili9881c(panel); 356 357 return mipi_dsi_dcs_set_display_off(ctx->dsi); 358 } 359 360 static int ili9881c_unprepare(struct drm_panel *panel) 361 { 362 struct ili9881c *ctx = panel_to_ili9881c(panel); 363 364 mipi_dsi_dcs_enter_sleep_mode(ctx->dsi); 365 regulator_disable(ctx->power); 366 gpiod_set_value(ctx->reset, 1); 367 368 return 0; 369 } 370 371 static const struct drm_display_mode bananapi_default_mode = { 372 .clock = 62000, 373 .vrefresh = 60, 374 375 .hdisplay = 720, 376 .hsync_start = 720 + 10, 377 .hsync_end = 720 + 10 + 20, 378 .htotal = 720 + 10 + 20 + 30, 379 380 .vdisplay = 1280, 381 .vsync_start = 1280 + 10, 382 .vsync_end = 1280 + 10 + 10, 383 .vtotal = 1280 + 10 + 10 + 20, 384 }; 385 386 static int ili9881c_get_modes(struct drm_panel *panel, 387 struct drm_connector *connector) 388 { 389 struct ili9881c *ctx = panel_to_ili9881c(panel); 390 struct drm_display_mode *mode; 391 392 mode = drm_mode_duplicate(connector->dev, &bananapi_default_mode); 393 if (!mode) { 394 dev_err(&ctx->dsi->dev, "failed to add mode %ux%ux@%u\n", 395 bananapi_default_mode.hdisplay, 396 bananapi_default_mode.vdisplay, 397 bananapi_default_mode.vrefresh); 398 return -ENOMEM; 399 } 400 401 drm_mode_set_name(mode); 402 403 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 404 drm_mode_probed_add(connector, mode); 405 406 connector->display_info.width_mm = 62; 407 connector->display_info.height_mm = 110; 408 409 return 1; 410 } 411 412 static const struct drm_panel_funcs ili9881c_funcs = { 413 .prepare = ili9881c_prepare, 414 .unprepare = ili9881c_unprepare, 415 .enable = ili9881c_enable, 416 .disable = ili9881c_disable, 417 .get_modes = ili9881c_get_modes, 418 }; 419 420 static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi) 421 { 422 struct ili9881c *ctx; 423 int ret; 424 425 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL); 426 if (!ctx) 427 return -ENOMEM; 428 mipi_dsi_set_drvdata(dsi, ctx); 429 ctx->dsi = dsi; 430 431 drm_panel_init(&ctx->panel, &dsi->dev, &ili9881c_funcs, 432 DRM_MODE_CONNECTOR_DSI); 433 434 ctx->power = devm_regulator_get(&dsi->dev, "power"); 435 if (IS_ERR(ctx->power)) { 436 dev_err(&dsi->dev, "Couldn't get our power regulator\n"); 437 return PTR_ERR(ctx->power); 438 } 439 440 ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW); 441 if (IS_ERR(ctx->reset)) { 442 dev_err(&dsi->dev, "Couldn't get our reset GPIO\n"); 443 return PTR_ERR(ctx->reset); 444 } 445 446 ret = drm_panel_of_backlight(&ctx->panel); 447 if (ret) 448 return ret; 449 450 ret = drm_panel_add(&ctx->panel); 451 if (ret < 0) 452 return ret; 453 454 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE; 455 dsi->format = MIPI_DSI_FMT_RGB888; 456 dsi->lanes = 4; 457 458 return mipi_dsi_attach(dsi); 459 } 460 461 static int ili9881c_dsi_remove(struct mipi_dsi_device *dsi) 462 { 463 struct ili9881c *ctx = mipi_dsi_get_drvdata(dsi); 464 465 mipi_dsi_detach(dsi); 466 drm_panel_remove(&ctx->panel); 467 468 return 0; 469 } 470 471 static const struct of_device_id ili9881c_of_match[] = { 472 { .compatible = "bananapi,lhr050h41" }, 473 { } 474 }; 475 MODULE_DEVICE_TABLE(of, ili9881c_of_match); 476 477 static struct mipi_dsi_driver ili9881c_dsi_driver = { 478 .probe = ili9881c_dsi_probe, 479 .remove = ili9881c_dsi_remove, 480 .driver = { 481 .name = "ili9881c-dsi", 482 .of_match_table = ili9881c_of_match, 483 }, 484 }; 485 module_mipi_dsi_driver(ili9881c_dsi_driver); 486 487 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 488 MODULE_DESCRIPTION("Ilitek ILI9881C Controller Driver"); 489 MODULE_LICENSE("GPL v2"); 490