1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) STMicroelectronics SA 2017 4 * 5 * Authors: Philippe Cornu <philippe.cornu@st.com> 6 * Yannick Fertre <yannick.fertre@st.com> 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/regulator/consumer.h> 14 15 #include <video/mipi_display.h> 16 17 #include <drm/drm_mipi_dsi.h> 18 #include <drm/drm_modes.h> 19 #include <drm/drm_panel.h> 20 #include <drm/drm_print.h> 21 22 /*** Manufacturer Command Set ***/ 23 #define MCS_CMD_MODE_SW 0xFE /* CMD Mode Switch */ 24 #define MCS_CMD1_UCS 0x00 /* User Command Set (UCS = CMD1) */ 25 #define MCS_CMD2_P0 0x01 /* Manufacture Command Set Page0 (CMD2 P0) */ 26 #define MCS_CMD2_P1 0x02 /* Manufacture Command Set Page1 (CMD2 P1) */ 27 #define MCS_CMD2_P2 0x03 /* Manufacture Command Set Page2 (CMD2 P2) */ 28 #define MCS_CMD2_P3 0x04 /* Manufacture Command Set Page3 (CMD2 P3) */ 29 30 /* CMD2 P0 commands (Display Options and Power) */ 31 #define MCS_STBCTR 0x12 /* TE1 Output Setting Zig-Zag Connection */ 32 #define MCS_SGOPCTR 0x16 /* Source Bias Current */ 33 #define MCS_SDCTR 0x1A /* Source Output Delay Time */ 34 #define MCS_INVCTR 0x1B /* Inversion Type */ 35 #define MCS_EXT_PWR_IC 0x24 /* External PWR IC Control */ 36 #define MCS_SETAVDD 0x27 /* PFM Control for AVDD Output */ 37 #define MCS_SETAVEE 0x29 /* PFM Control for AVEE Output */ 38 #define MCS_BT2CTR 0x2B /* DDVDL Charge Pump Control */ 39 #define MCS_BT3CTR 0x2F /* VGH Charge Pump Control */ 40 #define MCS_BT4CTR 0x34 /* VGL Charge Pump Control */ 41 #define MCS_VCMCTR 0x46 /* VCOM Output Level Control */ 42 #define MCS_SETVGN 0x52 /* VG M/S N Control */ 43 #define MCS_SETVGP 0x54 /* VG M/S P Control */ 44 #define MCS_SW_CTRL 0x5F /* Interface Control for PFM and MIPI */ 45 46 /* CMD2 P2 commands (GOA Timing Control) - no description in datasheet */ 47 #define GOA_VSTV1 0x00 48 #define GOA_VSTV2 0x07 49 #define GOA_VCLK1 0x0E 50 #define GOA_VCLK2 0x17 51 #define GOA_VCLK_OPT1 0x20 52 #define GOA_BICLK1 0x2A 53 #define GOA_BICLK2 0x37 54 #define GOA_BICLK3 0x44 55 #define GOA_BICLK4 0x4F 56 #define GOA_BICLK_OPT1 0x5B 57 #define GOA_BICLK_OPT2 0x60 58 #define MCS_GOA_GPO1 0x6D 59 #define MCS_GOA_GPO2 0x71 60 #define MCS_GOA_EQ 0x74 61 #define MCS_GOA_CLK_GALLON 0x7C 62 #define MCS_GOA_FS_SEL0 0x7E 63 #define MCS_GOA_FS_SEL1 0x87 64 #define MCS_GOA_FS_SEL2 0x91 65 #define MCS_GOA_FS_SEL3 0x9B 66 #define MCS_GOA_BS_SEL0 0xAC 67 #define MCS_GOA_BS_SEL1 0xB5 68 #define MCS_GOA_BS_SEL2 0xBF 69 #define MCS_GOA_BS_SEL3 0xC9 70 #define MCS_GOA_BS_SEL4 0xD3 71 72 /* CMD2 P3 commands (Gamma) */ 73 #define MCS_GAMMA_VP 0x60 /* Gamma VP1~VP16 */ 74 #define MCS_GAMMA_VN 0x70 /* Gamma VN1~VN16 */ 75 76 struct rm68200 { 77 struct device *dev; 78 struct drm_panel panel; 79 struct gpio_desc *reset_gpio; 80 struct regulator *supply; 81 struct backlight_device *backlight; 82 bool prepared; 83 bool enabled; 84 }; 85 86 static const struct drm_display_mode default_mode = { 87 .clock = 52582, 88 .hdisplay = 720, 89 .hsync_start = 720 + 38, 90 .hsync_end = 720 + 38 + 8, 91 .htotal = 720 + 38 + 8 + 38, 92 .vdisplay = 1280, 93 .vsync_start = 1280 + 12, 94 .vsync_end = 1280 + 12 + 4, 95 .vtotal = 1280 + 12 + 4 + 12, 96 .vrefresh = 50, 97 .flags = 0, 98 .width_mm = 68, 99 .height_mm = 122, 100 }; 101 102 static inline struct rm68200 *panel_to_rm68200(struct drm_panel *panel) 103 { 104 return container_of(panel, struct rm68200, panel); 105 } 106 107 static void rm68200_dcs_write_buf(struct rm68200 *ctx, const void *data, 108 size_t len) 109 { 110 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 111 int err; 112 113 err = mipi_dsi_dcs_write_buffer(dsi, data, len); 114 if (err < 0) 115 DRM_ERROR_RATELIMITED("MIPI DSI DCS write buffer failed: %d\n", 116 err); 117 } 118 119 static void rm68200_dcs_write_cmd(struct rm68200 *ctx, u8 cmd, u8 value) 120 { 121 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 122 int err; 123 124 err = mipi_dsi_dcs_write(dsi, cmd, &value, 1); 125 if (err < 0) 126 DRM_ERROR_RATELIMITED("MIPI DSI DCS write failed: %d\n", err); 127 } 128 129 #define dcs_write_seq(ctx, seq...) \ 130 ({ \ 131 static const u8 d[] = { seq }; \ 132 \ 133 rm68200_dcs_write_buf(ctx, d, ARRAY_SIZE(d)); \ 134 }) 135 136 /* 137 * This panel is not able to auto-increment all cmd addresses so for some of 138 * them, we need to send them one by one... 139 */ 140 #define dcs_write_cmd_seq(ctx, cmd, seq...) \ 141 ({ \ 142 static const u8 d[] = { seq }; \ 143 unsigned int i; \ 144 \ 145 for (i = 0; i < ARRAY_SIZE(d) ; i++) \ 146 rm68200_dcs_write_cmd(ctx, cmd + i, d[i]); \ 147 }) 148 149 static void rm68200_init_sequence(struct rm68200 *ctx) 150 { 151 /* Enter CMD2 with page 0 */ 152 dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD2_P0); 153 dcs_write_cmd_seq(ctx, MCS_EXT_PWR_IC, 0xC0, 0x53, 0x00); 154 dcs_write_seq(ctx, MCS_BT2CTR, 0xE5); 155 dcs_write_seq(ctx, MCS_SETAVDD, 0x0A); 156 dcs_write_seq(ctx, MCS_SETAVEE, 0x0A); 157 dcs_write_seq(ctx, MCS_SGOPCTR, 0x52); 158 dcs_write_seq(ctx, MCS_BT3CTR, 0x53); 159 dcs_write_seq(ctx, MCS_BT4CTR, 0x5A); 160 dcs_write_seq(ctx, MCS_INVCTR, 0x00); 161 dcs_write_seq(ctx, MCS_STBCTR, 0x0A); 162 dcs_write_seq(ctx, MCS_SDCTR, 0x06); 163 dcs_write_seq(ctx, MCS_VCMCTR, 0x56); 164 dcs_write_seq(ctx, MCS_SETVGN, 0xA0, 0x00); 165 dcs_write_seq(ctx, MCS_SETVGP, 0xA0, 0x00); 166 dcs_write_seq(ctx, MCS_SW_CTRL, 0x11); /* 2 data lanes, see doc */ 167 168 dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD2_P2); 169 dcs_write_seq(ctx, GOA_VSTV1, 0x05); 170 dcs_write_seq(ctx, 0x02, 0x0B); 171 dcs_write_seq(ctx, 0x03, 0x0F); 172 dcs_write_seq(ctx, 0x04, 0x7D, 0x00, 0x50); 173 dcs_write_cmd_seq(ctx, GOA_VSTV2, 0x05, 0x16, 0x0D, 0x11, 0x7D, 0x00, 174 0x50); 175 dcs_write_cmd_seq(ctx, GOA_VCLK1, 0x07, 0x08, 0x01, 0x02, 0x00, 0x7D, 176 0x00, 0x85, 0x08); 177 dcs_write_cmd_seq(ctx, GOA_VCLK2, 0x03, 0x04, 0x05, 0x06, 0x00, 0x7D, 178 0x00, 0x85, 0x08); 179 dcs_write_seq(ctx, GOA_VCLK_OPT1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 180 0x00, 0x00, 0x00, 0x00); 181 dcs_write_cmd_seq(ctx, GOA_BICLK1, 0x07, 0x08); 182 dcs_write_seq(ctx, 0x2D, 0x01); 183 dcs_write_seq(ctx, 0x2F, 0x02, 0x00, 0x40, 0x05, 0x08, 0x54, 0x7D, 184 0x00); 185 dcs_write_cmd_seq(ctx, GOA_BICLK2, 0x03, 0x04, 0x05, 0x06, 0x00); 186 dcs_write_seq(ctx, 0x3D, 0x40); 187 dcs_write_seq(ctx, 0x3F, 0x05, 0x08, 0x54, 0x7D, 0x00); 188 dcs_write_seq(ctx, GOA_BICLK3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 189 0x00, 0x00, 0x00, 0x00, 0x00); 190 dcs_write_seq(ctx, GOA_BICLK4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 191 0x00, 0x00); 192 dcs_write_seq(ctx, 0x58, 0x00, 0x00, 0x00); 193 dcs_write_seq(ctx, GOA_BICLK_OPT1, 0x00, 0x00, 0x00, 0x00, 0x00); 194 dcs_write_seq(ctx, GOA_BICLK_OPT2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 195 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00); 196 dcs_write_seq(ctx, MCS_GOA_GPO1, 0x00, 0x00, 0x00, 0x00); 197 dcs_write_seq(ctx, MCS_GOA_GPO2, 0x00, 0x20, 0x00); 198 dcs_write_seq(ctx, MCS_GOA_EQ, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 199 0x00, 0x00); 200 dcs_write_seq(ctx, MCS_GOA_CLK_GALLON, 0x00, 0x00); 201 dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL0, 0xBF, 0x02, 0x06, 0x14, 0x10, 202 0x16, 0x12, 0x08, 0x3F); 203 dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL1, 0x3F, 0x3F, 0x3F, 0x3F, 0x0C, 204 0x0A, 0x0E, 0x3F, 0x3F, 0x00); 205 dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL2, 0x04, 0x3F, 0x3F, 0x3F, 0x3F, 206 0x05, 0x01, 0x3F, 0x3F, 0x0F); 207 dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL3, 0x0B, 0x0D, 0x3F, 0x3F, 0x3F, 208 0x3F); 209 dcs_write_cmd_seq(ctx, 0xA2, 0x3F, 0x09, 0x13, 0x17, 0x11, 0x15); 210 dcs_write_cmd_seq(ctx, 0xA9, 0x07, 0x03, 0x3F); 211 dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL0, 0x3F, 0x05, 0x01, 0x17, 0x13, 212 0x15, 0x11, 0x0F, 0x3F); 213 dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL1, 0x3F, 0x3F, 0x3F, 0x3F, 0x0B, 214 0x0D, 0x09, 0x3F, 0x3F, 0x07); 215 dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL2, 0x03, 0x3F, 0x3F, 0x3F, 0x3F, 216 0x02, 0x06, 0x3F, 0x3F, 0x08); 217 dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL3, 0x0C, 0x0A, 0x3F, 0x3F, 0x3F, 218 0x3F, 0x3F, 0x0E, 0x10, 0x14); 219 dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL4, 0x12, 0x16, 0x00, 0x04, 0x3F); 220 dcs_write_seq(ctx, 0xDC, 0x02); 221 dcs_write_seq(ctx, 0xDE, 0x12); 222 223 dcs_write_seq(ctx, MCS_CMD_MODE_SW, 0x0E); /* No documentation */ 224 dcs_write_seq(ctx, 0x01, 0x75); 225 226 dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD2_P3); 227 dcs_write_cmd_seq(ctx, MCS_GAMMA_VP, 0x00, 0x0C, 0x12, 0x0E, 0x06, 228 0x12, 0x0E, 0x0B, 0x15, 0x0B, 0x10, 0x07, 0x0F, 229 0x12, 0x0C, 0x00); 230 dcs_write_cmd_seq(ctx, MCS_GAMMA_VN, 0x00, 0x0C, 0x12, 0x0E, 0x06, 231 0x12, 0x0E, 0x0B, 0x15, 0x0B, 0x10, 0x07, 0x0F, 232 0x12, 0x0C, 0x00); 233 234 /* Exit CMD2 */ 235 dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD1_UCS); 236 } 237 238 static int rm68200_disable(struct drm_panel *panel) 239 { 240 struct rm68200 *ctx = panel_to_rm68200(panel); 241 242 if (!ctx->enabled) 243 return 0; 244 245 backlight_disable(ctx->backlight); 246 247 ctx->enabled = false; 248 249 return 0; 250 } 251 252 static int rm68200_unprepare(struct drm_panel *panel) 253 { 254 struct rm68200 *ctx = panel_to_rm68200(panel); 255 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 256 int ret; 257 258 if (!ctx->prepared) 259 return 0; 260 261 ret = mipi_dsi_dcs_set_display_off(dsi); 262 if (ret) 263 DRM_WARN("failed to set display off: %d\n", ret); 264 265 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 266 if (ret) 267 DRM_WARN("failed to enter sleep mode: %d\n", ret); 268 269 msleep(120); 270 271 if (ctx->reset_gpio) { 272 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 273 msleep(20); 274 } 275 276 regulator_disable(ctx->supply); 277 278 ctx->prepared = false; 279 280 return 0; 281 } 282 283 static int rm68200_prepare(struct drm_panel *panel) 284 { 285 struct rm68200 *ctx = panel_to_rm68200(panel); 286 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 287 int ret; 288 289 if (ctx->prepared) 290 return 0; 291 292 ret = regulator_enable(ctx->supply); 293 if (ret < 0) { 294 DRM_ERROR("failed to enable supply: %d\n", ret); 295 return ret; 296 } 297 298 if (ctx->reset_gpio) { 299 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 300 msleep(20); 301 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 302 msleep(100); 303 } 304 305 rm68200_init_sequence(ctx); 306 307 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 308 if (ret) 309 return ret; 310 311 msleep(125); 312 313 ret = mipi_dsi_dcs_set_display_on(dsi); 314 if (ret) 315 return ret; 316 317 msleep(20); 318 319 ctx->prepared = true; 320 321 return 0; 322 } 323 324 static int rm68200_enable(struct drm_panel *panel) 325 { 326 struct rm68200 *ctx = panel_to_rm68200(panel); 327 328 if (ctx->enabled) 329 return 0; 330 331 backlight_enable(ctx->backlight); 332 333 ctx->enabled = true; 334 335 return 0; 336 } 337 338 static int rm68200_get_modes(struct drm_panel *panel) 339 { 340 struct drm_display_mode *mode; 341 342 mode = drm_mode_duplicate(panel->drm, &default_mode); 343 if (!mode) { 344 DRM_ERROR("failed to add mode %ux%ux@%u\n", 345 default_mode.hdisplay, default_mode.vdisplay, 346 default_mode.vrefresh); 347 return -ENOMEM; 348 } 349 350 drm_mode_set_name(mode); 351 352 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 353 drm_mode_probed_add(panel->connector, mode); 354 355 panel->connector->display_info.width_mm = mode->width_mm; 356 panel->connector->display_info.height_mm = mode->height_mm; 357 358 return 1; 359 } 360 361 static const struct drm_panel_funcs rm68200_drm_funcs = { 362 .disable = rm68200_disable, 363 .unprepare = rm68200_unprepare, 364 .prepare = rm68200_prepare, 365 .enable = rm68200_enable, 366 .get_modes = rm68200_get_modes, 367 }; 368 369 static int rm68200_probe(struct mipi_dsi_device *dsi) 370 { 371 struct device *dev = &dsi->dev; 372 struct rm68200 *ctx; 373 int ret; 374 375 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 376 if (!ctx) 377 return -ENOMEM; 378 379 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 380 if (IS_ERR(ctx->reset_gpio)) { 381 ret = PTR_ERR(ctx->reset_gpio); 382 dev_err(dev, "cannot get reset GPIO: %d\n", ret); 383 return ret; 384 } 385 386 ctx->supply = devm_regulator_get(dev, "power"); 387 if (IS_ERR(ctx->supply)) { 388 ret = PTR_ERR(ctx->supply); 389 if (ret != -EPROBE_DEFER) 390 dev_err(dev, "cannot get regulator: %d\n", ret); 391 return ret; 392 } 393 394 ctx->backlight = devm_of_find_backlight(dev); 395 if (IS_ERR(ctx->backlight)) 396 return PTR_ERR(ctx->backlight); 397 398 mipi_dsi_set_drvdata(dsi, ctx); 399 400 ctx->dev = dev; 401 402 dsi->lanes = 2; 403 dsi->format = MIPI_DSI_FMT_RGB888; 404 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | 405 MIPI_DSI_MODE_LPM; 406 407 drm_panel_init(&ctx->panel, dev, &rm68200_drm_funcs, 408 DRM_MODE_CONNECTOR_DSI); 409 410 drm_panel_add(&ctx->panel); 411 412 ret = mipi_dsi_attach(dsi); 413 if (ret < 0) { 414 dev_err(dev, "mipi_dsi_attach() failed: %d\n", ret); 415 drm_panel_remove(&ctx->panel); 416 return ret; 417 } 418 419 return 0; 420 } 421 422 static int rm68200_remove(struct mipi_dsi_device *dsi) 423 { 424 struct rm68200 *ctx = mipi_dsi_get_drvdata(dsi); 425 426 mipi_dsi_detach(dsi); 427 drm_panel_remove(&ctx->panel); 428 429 return 0; 430 } 431 432 static const struct of_device_id raydium_rm68200_of_match[] = { 433 { .compatible = "raydium,rm68200" }, 434 { } 435 }; 436 MODULE_DEVICE_TABLE(of, raydium_rm68200_of_match); 437 438 static struct mipi_dsi_driver raydium_rm68200_driver = { 439 .probe = rm68200_probe, 440 .remove = rm68200_remove, 441 .driver = { 442 .name = "panel-raydium-rm68200", 443 .of_match_table = raydium_rm68200_of_match, 444 }, 445 }; 446 module_mipi_dsi_driver(raydium_rm68200_driver); 447 448 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 449 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 450 MODULE_DESCRIPTION("DRM Driver for Raydium RM68200 MIPI DSI panel"); 451 MODULE_LICENSE("GPL v2"); 452