1 /* 2 * Copyright (C) 2017 Free Electrons 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License version 6 * 2 as published by the Free Software Foundation. 7 */ 8 9 #include <linux/gpio/consumer.h> 10 #include <linux/regulator/consumer.h> 11 #include <linux/spi/spi.h> 12 13 #include <drm/drmP.h> 14 #include <drm/drm_panel.h> 15 16 #include <video/mipi_display.h> 17 18 #define ST7789V_COLMOD_RGB_FMT_18BITS (6 << 4) 19 #define ST7789V_COLMOD_CTRL_FMT_18BITS (6 << 0) 20 21 #define ST7789V_RAMCTRL_CMD 0xb0 22 #define ST7789V_RAMCTRL_RM_RGB BIT(4) 23 #define ST7789V_RAMCTRL_DM_RGB BIT(0) 24 #define ST7789V_RAMCTRL_MAGIC (3 << 6) 25 #define ST7789V_RAMCTRL_EPF(n) (((n) & 3) << 4) 26 27 #define ST7789V_RGBCTRL_CMD 0xb1 28 #define ST7789V_RGBCTRL_WO BIT(7) 29 #define ST7789V_RGBCTRL_RCM(n) (((n) & 3) << 5) 30 #define ST7789V_RGBCTRL_VSYNC_HIGH BIT(3) 31 #define ST7789V_RGBCTRL_HSYNC_HIGH BIT(2) 32 #define ST7789V_RGBCTRL_PCLK_HIGH BIT(1) 33 #define ST7789V_RGBCTRL_VBP(n) ((n) & 0x7f) 34 #define ST7789V_RGBCTRL_HBP(n) ((n) & 0x1f) 35 36 #define ST7789V_PORCTRL_CMD 0xb2 37 #define ST7789V_PORCTRL_IDLE_BP(n) (((n) & 0xf) << 4) 38 #define ST7789V_PORCTRL_IDLE_FP(n) ((n) & 0xf) 39 #define ST7789V_PORCTRL_PARTIAL_BP(n) (((n) & 0xf) << 4) 40 #define ST7789V_PORCTRL_PARTIAL_FP(n) ((n) & 0xf) 41 42 #define ST7789V_GCTRL_CMD 0xb7 43 #define ST7789V_GCTRL_VGHS(n) (((n) & 7) << 4) 44 #define ST7789V_GCTRL_VGLS(n) ((n) & 7) 45 46 #define ST7789V_VCOMS_CMD 0xbb 47 48 #define ST7789V_LCMCTRL_CMD 0xc0 49 #define ST7789V_LCMCTRL_XBGR BIT(5) 50 #define ST7789V_LCMCTRL_XMX BIT(3) 51 #define ST7789V_LCMCTRL_XMH BIT(2) 52 53 #define ST7789V_VDVVRHEN_CMD 0xc2 54 #define ST7789V_VDVVRHEN_CMDEN BIT(0) 55 56 #define ST7789V_VRHS_CMD 0xc3 57 58 #define ST7789V_VDVS_CMD 0xc4 59 60 #define ST7789V_FRCTRL2_CMD 0xc6 61 62 #define ST7789V_PWCTRL1_CMD 0xd0 63 #define ST7789V_PWCTRL1_MAGIC 0xa4 64 #define ST7789V_PWCTRL1_AVDD(n) (((n) & 3) << 6) 65 #define ST7789V_PWCTRL1_AVCL(n) (((n) & 3) << 4) 66 #define ST7789V_PWCTRL1_VDS(n) ((n) & 3) 67 68 #define ST7789V_PVGAMCTRL_CMD 0xe0 69 #define ST7789V_PVGAMCTRL_JP0(n) (((n) & 3) << 4) 70 #define ST7789V_PVGAMCTRL_JP1(n) (((n) & 3) << 4) 71 #define ST7789V_PVGAMCTRL_VP0(n) ((n) & 0xf) 72 #define ST7789V_PVGAMCTRL_VP1(n) ((n) & 0x3f) 73 #define ST7789V_PVGAMCTRL_VP2(n) ((n) & 0x3f) 74 #define ST7789V_PVGAMCTRL_VP4(n) ((n) & 0x1f) 75 #define ST7789V_PVGAMCTRL_VP6(n) ((n) & 0x1f) 76 #define ST7789V_PVGAMCTRL_VP13(n) ((n) & 0xf) 77 #define ST7789V_PVGAMCTRL_VP20(n) ((n) & 0x7f) 78 #define ST7789V_PVGAMCTRL_VP27(n) ((n) & 7) 79 #define ST7789V_PVGAMCTRL_VP36(n) (((n) & 7) << 4) 80 #define ST7789V_PVGAMCTRL_VP43(n) ((n) & 0x7f) 81 #define ST7789V_PVGAMCTRL_VP50(n) ((n) & 0xf) 82 #define ST7789V_PVGAMCTRL_VP57(n) ((n) & 0x1f) 83 #define ST7789V_PVGAMCTRL_VP59(n) ((n) & 0x1f) 84 #define ST7789V_PVGAMCTRL_VP61(n) ((n) & 0x3f) 85 #define ST7789V_PVGAMCTRL_VP62(n) ((n) & 0x3f) 86 #define ST7789V_PVGAMCTRL_VP63(n) (((n) & 0xf) << 4) 87 88 #define ST7789V_NVGAMCTRL_CMD 0xe1 89 #define ST7789V_NVGAMCTRL_JN0(n) (((n) & 3) << 4) 90 #define ST7789V_NVGAMCTRL_JN1(n) (((n) & 3) << 4) 91 #define ST7789V_NVGAMCTRL_VN0(n) ((n) & 0xf) 92 #define ST7789V_NVGAMCTRL_VN1(n) ((n) & 0x3f) 93 #define ST7789V_NVGAMCTRL_VN2(n) ((n) & 0x3f) 94 #define ST7789V_NVGAMCTRL_VN4(n) ((n) & 0x1f) 95 #define ST7789V_NVGAMCTRL_VN6(n) ((n) & 0x1f) 96 #define ST7789V_NVGAMCTRL_VN13(n) ((n) & 0xf) 97 #define ST7789V_NVGAMCTRL_VN20(n) ((n) & 0x7f) 98 #define ST7789V_NVGAMCTRL_VN27(n) ((n) & 7) 99 #define ST7789V_NVGAMCTRL_VN36(n) (((n) & 7) << 4) 100 #define ST7789V_NVGAMCTRL_VN43(n) ((n) & 0x7f) 101 #define ST7789V_NVGAMCTRL_VN50(n) ((n) & 0xf) 102 #define ST7789V_NVGAMCTRL_VN57(n) ((n) & 0x1f) 103 #define ST7789V_NVGAMCTRL_VN59(n) ((n) & 0x1f) 104 #define ST7789V_NVGAMCTRL_VN61(n) ((n) & 0x3f) 105 #define ST7789V_NVGAMCTRL_VN62(n) ((n) & 0x3f) 106 #define ST7789V_NVGAMCTRL_VN63(n) (((n) & 0xf) << 4) 107 108 #define ST7789V_TEST(val, func) \ 109 do { \ 110 if ((val = (func))) \ 111 return val; \ 112 } while (0) 113 114 struct st7789v { 115 struct drm_panel panel; 116 struct spi_device *spi; 117 struct gpio_desc *reset; 118 struct backlight_device *backlight; 119 struct regulator *power; 120 }; 121 122 enum st7789v_prefix { 123 ST7789V_COMMAND = 0, 124 ST7789V_DATA = 1, 125 }; 126 127 static inline struct st7789v *panel_to_st7789v(struct drm_panel *panel) 128 { 129 return container_of(panel, struct st7789v, panel); 130 } 131 132 static int st7789v_spi_write(struct st7789v *ctx, enum st7789v_prefix prefix, 133 u8 data) 134 { 135 struct spi_transfer xfer = { }; 136 struct spi_message msg; 137 u16 txbuf = ((prefix & 1) << 8) | data; 138 139 spi_message_init(&msg); 140 141 xfer.tx_buf = &txbuf; 142 xfer.bits_per_word = 9; 143 xfer.len = sizeof(txbuf); 144 145 spi_message_add_tail(&xfer, &msg); 146 return spi_sync(ctx->spi, &msg); 147 } 148 149 static int st7789v_write_command(struct st7789v *ctx, u8 cmd) 150 { 151 return st7789v_spi_write(ctx, ST7789V_COMMAND, cmd); 152 } 153 154 static int st7789v_write_data(struct st7789v *ctx, u8 cmd) 155 { 156 return st7789v_spi_write(ctx, ST7789V_DATA, cmd); 157 } 158 159 static const struct drm_display_mode default_mode = { 160 .clock = 7000, 161 .hdisplay = 240, 162 .hsync_start = 240 + 38, 163 .hsync_end = 240 + 38 + 10, 164 .htotal = 240 + 38 + 10 + 10, 165 .vdisplay = 320, 166 .vsync_start = 320 + 8, 167 .vsync_end = 320 + 8 + 4, 168 .vtotal = 320 + 8 + 4 + 4, 169 .vrefresh = 60, 170 }; 171 172 static int st7789v_get_modes(struct drm_panel *panel) 173 { 174 struct drm_connector *connector = panel->connector; 175 struct drm_display_mode *mode; 176 177 mode = drm_mode_duplicate(panel->drm, &default_mode); 178 if (!mode) { 179 dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n", 180 default_mode.hdisplay, default_mode.vdisplay, 181 default_mode.vrefresh); 182 return -ENOMEM; 183 } 184 185 drm_mode_set_name(mode); 186 187 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 188 drm_mode_probed_add(connector, mode); 189 190 panel->connector->display_info.width_mm = 61; 191 panel->connector->display_info.height_mm = 103; 192 193 return 1; 194 } 195 196 static int st7789v_prepare(struct drm_panel *panel) 197 { 198 struct st7789v *ctx = panel_to_st7789v(panel); 199 int ret; 200 201 ret = regulator_enable(ctx->power); 202 if (ret) 203 return ret; 204 205 gpiod_set_value(ctx->reset, 1); 206 msleep(30); 207 gpiod_set_value(ctx->reset, 0); 208 msleep(120); 209 210 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_EXIT_SLEEP_MODE)); 211 212 /* We need to wait 120ms after a sleep out command */ 213 msleep(120); 214 215 ST7789V_TEST(ret, st7789v_write_command(ctx, 216 MIPI_DCS_SET_ADDRESS_MODE)); 217 ST7789V_TEST(ret, st7789v_write_data(ctx, 0)); 218 219 ST7789V_TEST(ret, st7789v_write_command(ctx, 220 MIPI_DCS_SET_PIXEL_FORMAT)); 221 ST7789V_TEST(ret, st7789v_write_data(ctx, 222 (MIPI_DCS_PIXEL_FMT_18BIT << 4) | 223 (MIPI_DCS_PIXEL_FMT_18BIT))); 224 225 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PORCTRL_CMD)); 226 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc)); 227 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc)); 228 ST7789V_TEST(ret, st7789v_write_data(ctx, 0)); 229 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PORCTRL_IDLE_BP(3) | 230 ST7789V_PORCTRL_IDLE_FP(3))); 231 ST7789V_TEST(ret, st7789v_write_data(ctx, 232 ST7789V_PORCTRL_PARTIAL_BP(3) | 233 ST7789V_PORCTRL_PARTIAL_FP(3))); 234 235 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_GCTRL_CMD)); 236 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_GCTRL_VGLS(5) | 237 ST7789V_GCTRL_VGHS(3))); 238 239 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VCOMS_CMD)); 240 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x2b)); 241 242 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_LCMCTRL_CMD)); 243 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_LCMCTRL_XMH | 244 ST7789V_LCMCTRL_XMX | 245 ST7789V_LCMCTRL_XBGR)); 246 247 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVVRHEN_CMD)); 248 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_VDVVRHEN_CMDEN)); 249 250 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VRHS_CMD)); 251 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf)); 252 253 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVS_CMD)); 254 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x20)); 255 256 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_FRCTRL2_CMD)); 257 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf)); 258 259 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PWCTRL1_CMD)); 260 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_MAGIC)); 261 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_AVDD(2) | 262 ST7789V_PWCTRL1_AVCL(2) | 263 ST7789V_PWCTRL1_VDS(1))); 264 265 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PVGAMCTRL_CMD)); 266 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP63(0xd))); 267 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP1(0xca))); 268 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP2(0xe))); 269 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP4(8))); 270 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP6(9))); 271 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP13(7))); 272 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP20(0x2d))); 273 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP27(0xb) | 274 ST7789V_PVGAMCTRL_VP36(3))); 275 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP43(0x3d))); 276 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_JP1(3) | 277 ST7789V_PVGAMCTRL_VP50(4))); 278 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP57(0xa))); 279 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP59(0xa))); 280 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP61(0x1b))); 281 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP62(0x28))); 282 283 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_NVGAMCTRL_CMD)); 284 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN63(0xd))); 285 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN1(0xca))); 286 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN2(0xf))); 287 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN4(8))); 288 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN6(8))); 289 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN13(7))); 290 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN20(0x2e))); 291 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN27(0xc) | 292 ST7789V_NVGAMCTRL_VN36(5))); 293 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN43(0x40))); 294 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_JN1(3) | 295 ST7789V_NVGAMCTRL_VN50(4))); 296 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN57(9))); 297 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN59(0xb))); 298 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN61(0x1b))); 299 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN62(0x28))); 300 301 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_INVERT_MODE)); 302 303 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RAMCTRL_CMD)); 304 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_DM_RGB | 305 ST7789V_RAMCTRL_RM_RGB)); 306 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_EPF(3) | 307 ST7789V_RAMCTRL_MAGIC)); 308 309 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD)); 310 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_WO | 311 ST7789V_RGBCTRL_RCM(2) | 312 ST7789V_RGBCTRL_VSYNC_HIGH | 313 ST7789V_RGBCTRL_HSYNC_HIGH | 314 ST7789V_RGBCTRL_PCLK_HIGH)); 315 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8))); 316 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_HBP(20))); 317 318 return 0; 319 } 320 321 static int st7789v_enable(struct drm_panel *panel) 322 { 323 struct st7789v *ctx = panel_to_st7789v(panel); 324 325 if (ctx->backlight) { 326 ctx->backlight->props.state &= ~BL_CORE_FBBLANK; 327 ctx->backlight->props.power = FB_BLANK_UNBLANK; 328 backlight_update_status(ctx->backlight); 329 } 330 331 return st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_ON); 332 } 333 334 static int st7789v_disable(struct drm_panel *panel) 335 { 336 struct st7789v *ctx = panel_to_st7789v(panel); 337 int ret; 338 339 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_OFF)); 340 341 if (ctx->backlight) { 342 ctx->backlight->props.power = FB_BLANK_POWERDOWN; 343 ctx->backlight->props.state |= BL_CORE_FBBLANK; 344 backlight_update_status(ctx->backlight); 345 } 346 347 return 0; 348 } 349 350 static int st7789v_unprepare(struct drm_panel *panel) 351 { 352 struct st7789v *ctx = panel_to_st7789v(panel); 353 int ret; 354 355 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_SLEEP_MODE)); 356 357 regulator_disable(ctx->power); 358 359 return 0; 360 } 361 362 static const struct drm_panel_funcs st7789v_drm_funcs = { 363 .disable = st7789v_disable, 364 .enable = st7789v_enable, 365 .get_modes = st7789v_get_modes, 366 .prepare = st7789v_prepare, 367 .unprepare = st7789v_unprepare, 368 }; 369 370 static int st7789v_probe(struct spi_device *spi) 371 { 372 struct device_node *backlight; 373 struct st7789v *ctx; 374 int ret; 375 376 ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL); 377 if (!ctx) 378 return -ENOMEM; 379 380 spi_set_drvdata(spi, ctx); 381 ctx->spi = spi; 382 383 ctx->panel.dev = &spi->dev; 384 ctx->panel.funcs = &st7789v_drm_funcs; 385 386 ctx->power = devm_regulator_get(&spi->dev, "power"); 387 if (IS_ERR(ctx->power)) 388 return PTR_ERR(ctx->power); 389 390 ctx->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW); 391 if (IS_ERR(ctx->reset)) { 392 dev_err(&spi->dev, "Couldn't get our reset line\n"); 393 return PTR_ERR(ctx->reset); 394 } 395 396 backlight = of_parse_phandle(spi->dev.of_node, "backlight", 0); 397 if (backlight) { 398 ctx->backlight = of_find_backlight_by_node(backlight); 399 of_node_put(backlight); 400 401 if (!ctx->backlight) 402 return -EPROBE_DEFER; 403 } 404 405 ret = drm_panel_add(&ctx->panel); 406 if (ret < 0) 407 goto err_free_backlight; 408 409 return 0; 410 411 err_free_backlight: 412 if (ctx->backlight) 413 put_device(&ctx->backlight->dev); 414 415 return ret; 416 } 417 418 static int st7789v_remove(struct spi_device *spi) 419 { 420 struct st7789v *ctx = spi_get_drvdata(spi); 421 422 drm_panel_remove(&ctx->panel); 423 424 if (ctx->backlight) 425 put_device(&ctx->backlight->dev); 426 427 return 0; 428 } 429 430 static const struct of_device_id st7789v_of_match[] = { 431 { .compatible = "sitronix,st7789v" }, 432 { } 433 }; 434 MODULE_DEVICE_TABLE(of, st7789v_of_match); 435 436 static struct spi_driver st7789v_driver = { 437 .probe = st7789v_probe, 438 .remove = st7789v_remove, 439 .driver = { 440 .name = "st7789v", 441 .of_match_table = st7789v_of_match, 442 }, 443 }; 444 module_spi_driver(st7789v_driver); 445 446 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 447 MODULE_DESCRIPTION("Sitronix st7789v LCD Driver"); 448 MODULE_LICENSE("GPL v2"); 449