1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2017 Free Electrons 4 */ 5 6 #include <linux/delay.h> 7 #include <linux/gpio/consumer.h> 8 #include <linux/module.h> 9 #include <linux/regulator/consumer.h> 10 #include <linux/spi/spi.h> 11 12 #include <video/mipi_display.h> 13 14 #include <drm/drm_device.h> 15 #include <drm/drm_modes.h> 16 #include <drm/drm_panel.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 regulator *power; 119 }; 120 121 enum st7789v_prefix { 122 ST7789V_COMMAND = 0, 123 ST7789V_DATA = 1, 124 }; 125 126 static inline struct st7789v *panel_to_st7789v(struct drm_panel *panel) 127 { 128 return container_of(panel, struct st7789v, panel); 129 } 130 131 static int st7789v_spi_write(struct st7789v *ctx, enum st7789v_prefix prefix, 132 u8 data) 133 { 134 struct spi_transfer xfer = { }; 135 struct spi_message msg; 136 u16 txbuf = ((prefix & 1) << 8) | data; 137 138 spi_message_init(&msg); 139 140 xfer.tx_buf = &txbuf; 141 xfer.bits_per_word = 9; 142 xfer.len = sizeof(txbuf); 143 144 spi_message_add_tail(&xfer, &msg); 145 return spi_sync(ctx->spi, &msg); 146 } 147 148 static int st7789v_write_command(struct st7789v *ctx, u8 cmd) 149 { 150 return st7789v_spi_write(ctx, ST7789V_COMMAND, cmd); 151 } 152 153 static int st7789v_write_data(struct st7789v *ctx, u8 cmd) 154 { 155 return st7789v_spi_write(ctx, ST7789V_DATA, cmd); 156 } 157 158 static const struct drm_display_mode default_mode = { 159 .clock = 7000, 160 .hdisplay = 240, 161 .hsync_start = 240 + 38, 162 .hsync_end = 240 + 38 + 10, 163 .htotal = 240 + 38 + 10 + 10, 164 .vdisplay = 320, 165 .vsync_start = 320 + 8, 166 .vsync_end = 320 + 8 + 4, 167 .vtotal = 320 + 8 + 4 + 4, 168 }; 169 170 static int st7789v_get_modes(struct drm_panel *panel, 171 struct drm_connector *connector) 172 { 173 struct drm_display_mode *mode; 174 175 mode = drm_mode_duplicate(connector->dev, &default_mode); 176 if (!mode) { 177 dev_err(panel->dev, "failed to add mode %ux%ux@%u\n", 178 default_mode.hdisplay, default_mode.vdisplay, 179 drm_mode_vrefresh(&default_mode)); 180 return -ENOMEM; 181 } 182 183 drm_mode_set_name(mode); 184 185 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 186 drm_mode_probed_add(connector, mode); 187 188 connector->display_info.width_mm = 61; 189 connector->display_info.height_mm = 103; 190 191 return 1; 192 } 193 194 static int st7789v_prepare(struct drm_panel *panel) 195 { 196 struct st7789v *ctx = panel_to_st7789v(panel); 197 int ret; 198 199 ret = regulator_enable(ctx->power); 200 if (ret) 201 return ret; 202 203 gpiod_set_value(ctx->reset, 1); 204 msleep(30); 205 gpiod_set_value(ctx->reset, 0); 206 msleep(120); 207 208 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_EXIT_SLEEP_MODE)); 209 210 /* We need to wait 120ms after a sleep out command */ 211 msleep(120); 212 213 ST7789V_TEST(ret, st7789v_write_command(ctx, 214 MIPI_DCS_SET_ADDRESS_MODE)); 215 ST7789V_TEST(ret, st7789v_write_data(ctx, 0)); 216 217 ST7789V_TEST(ret, st7789v_write_command(ctx, 218 MIPI_DCS_SET_PIXEL_FORMAT)); 219 ST7789V_TEST(ret, st7789v_write_data(ctx, 220 (MIPI_DCS_PIXEL_FMT_18BIT << 4) | 221 (MIPI_DCS_PIXEL_FMT_18BIT))); 222 223 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PORCTRL_CMD)); 224 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc)); 225 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc)); 226 ST7789V_TEST(ret, st7789v_write_data(ctx, 0)); 227 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PORCTRL_IDLE_BP(3) | 228 ST7789V_PORCTRL_IDLE_FP(3))); 229 ST7789V_TEST(ret, st7789v_write_data(ctx, 230 ST7789V_PORCTRL_PARTIAL_BP(3) | 231 ST7789V_PORCTRL_PARTIAL_FP(3))); 232 233 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_GCTRL_CMD)); 234 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_GCTRL_VGLS(5) | 235 ST7789V_GCTRL_VGHS(3))); 236 237 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VCOMS_CMD)); 238 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x2b)); 239 240 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_LCMCTRL_CMD)); 241 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_LCMCTRL_XMH | 242 ST7789V_LCMCTRL_XMX | 243 ST7789V_LCMCTRL_XBGR)); 244 245 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVVRHEN_CMD)); 246 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_VDVVRHEN_CMDEN)); 247 248 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VRHS_CMD)); 249 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf)); 250 251 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVS_CMD)); 252 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x20)); 253 254 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_FRCTRL2_CMD)); 255 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf)); 256 257 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PWCTRL1_CMD)); 258 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_MAGIC)); 259 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_AVDD(2) | 260 ST7789V_PWCTRL1_AVCL(2) | 261 ST7789V_PWCTRL1_VDS(1))); 262 263 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PVGAMCTRL_CMD)); 264 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP63(0xd))); 265 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP1(0xca))); 266 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP2(0xe))); 267 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP4(8))); 268 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP6(9))); 269 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP13(7))); 270 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP20(0x2d))); 271 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP27(0xb) | 272 ST7789V_PVGAMCTRL_VP36(3))); 273 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP43(0x3d))); 274 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_JP1(3) | 275 ST7789V_PVGAMCTRL_VP50(4))); 276 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP57(0xa))); 277 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP59(0xa))); 278 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP61(0x1b))); 279 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP62(0x28))); 280 281 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_NVGAMCTRL_CMD)); 282 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN63(0xd))); 283 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN1(0xca))); 284 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN2(0xf))); 285 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN4(8))); 286 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN6(8))); 287 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN13(7))); 288 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN20(0x2e))); 289 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN27(0xc) | 290 ST7789V_NVGAMCTRL_VN36(5))); 291 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN43(0x40))); 292 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_JN1(3) | 293 ST7789V_NVGAMCTRL_VN50(4))); 294 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN57(9))); 295 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN59(0xb))); 296 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN61(0x1b))); 297 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN62(0x28))); 298 299 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_INVERT_MODE)); 300 301 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RAMCTRL_CMD)); 302 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_DM_RGB | 303 ST7789V_RAMCTRL_RM_RGB)); 304 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_EPF(3) | 305 ST7789V_RAMCTRL_MAGIC)); 306 307 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD)); 308 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_WO | 309 ST7789V_RGBCTRL_RCM(2) | 310 ST7789V_RGBCTRL_VSYNC_HIGH | 311 ST7789V_RGBCTRL_HSYNC_HIGH | 312 ST7789V_RGBCTRL_PCLK_HIGH)); 313 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8))); 314 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_HBP(20))); 315 316 return 0; 317 } 318 319 static int st7789v_enable(struct drm_panel *panel) 320 { 321 struct st7789v *ctx = panel_to_st7789v(panel); 322 323 return st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_ON); 324 } 325 326 static int st7789v_disable(struct drm_panel *panel) 327 { 328 struct st7789v *ctx = panel_to_st7789v(panel); 329 int ret; 330 331 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_OFF)); 332 333 return 0; 334 } 335 336 static int st7789v_unprepare(struct drm_panel *panel) 337 { 338 struct st7789v *ctx = panel_to_st7789v(panel); 339 int ret; 340 341 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_SLEEP_MODE)); 342 343 regulator_disable(ctx->power); 344 345 return 0; 346 } 347 348 static const struct drm_panel_funcs st7789v_drm_funcs = { 349 .disable = st7789v_disable, 350 .enable = st7789v_enable, 351 .get_modes = st7789v_get_modes, 352 .prepare = st7789v_prepare, 353 .unprepare = st7789v_unprepare, 354 }; 355 356 static int st7789v_probe(struct spi_device *spi) 357 { 358 struct st7789v *ctx; 359 int ret; 360 361 ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL); 362 if (!ctx) 363 return -ENOMEM; 364 365 spi_set_drvdata(spi, ctx); 366 ctx->spi = spi; 367 368 drm_panel_init(&ctx->panel, &spi->dev, &st7789v_drm_funcs, 369 DRM_MODE_CONNECTOR_DPI); 370 371 ctx->power = devm_regulator_get(&spi->dev, "power"); 372 if (IS_ERR(ctx->power)) 373 return PTR_ERR(ctx->power); 374 375 ctx->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW); 376 if (IS_ERR(ctx->reset)) { 377 dev_err(&spi->dev, "Couldn't get our reset line\n"); 378 return PTR_ERR(ctx->reset); 379 } 380 381 ret = drm_panel_of_backlight(&ctx->panel); 382 if (ret) 383 return ret; 384 385 drm_panel_add(&ctx->panel); 386 387 return 0; 388 } 389 390 static int st7789v_remove(struct spi_device *spi) 391 { 392 struct st7789v *ctx = spi_get_drvdata(spi); 393 394 drm_panel_remove(&ctx->panel); 395 396 return 0; 397 } 398 399 static const struct of_device_id st7789v_of_match[] = { 400 { .compatible = "sitronix,st7789v" }, 401 { } 402 }; 403 MODULE_DEVICE_TABLE(of, st7789v_of_match); 404 405 static struct spi_driver st7789v_driver = { 406 .probe = st7789v_probe, 407 .remove = st7789v_remove, 408 .driver = { 409 .name = "st7789v", 410 .of_match_table = st7789v_of_match, 411 }, 412 }; 413 module_spi_driver(st7789v_driver); 414 415 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 416 MODULE_DESCRIPTION("Sitronix st7789v LCD Driver"); 417 MODULE_LICENSE("GPL v2"); 418