1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ld9040 AMOLED LCD drm_panel driver. 4 * 5 * Copyright (c) 2014 Samsung Electronics Co., Ltd 6 * Derived from drivers/video/backlight/ld9040.c 7 * 8 * Andrzej Hajda <a.hajda@samsung.com> 9 */ 10 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 #include <linux/spi/spi.h> 17 18 #include <video/mipi_display.h> 19 #include <video/of_videomode.h> 20 #include <video/videomode.h> 21 22 #include <drm/drm_modes.h> 23 #include <drm/drm_panel.h> 24 #include <drm/drm_print.h> 25 26 /* Manufacturer Command Set */ 27 #define MCS_MANPWR 0xb0 28 #define MCS_ELVSS_ON 0xb1 29 #define MCS_USER_SETTING 0xf0 30 #define MCS_DISPCTL 0xf2 31 #define MCS_POWER_CTRL 0xf4 32 #define MCS_GTCON 0xf7 33 #define MCS_PANEL_CONDITION 0xf8 34 #define MCS_GAMMA_SET1 0xf9 35 #define MCS_GAMMA_CTRL 0xfb 36 37 /* array of gamma tables for gamma value 2.2 */ 38 static u8 const ld9040_gammas[25][22] = { 39 { 0xf9, 0x00, 0x13, 0xb2, 0xba, 0xd2, 0x00, 0x30, 0x00, 0xaf, 0xc0, 40 0xb8, 0xcd, 0x00, 0x3d, 0x00, 0xa8, 0xb8, 0xb7, 0xcd, 0x00, 0x44 }, 41 { 0xf9, 0x00, 0x13, 0xb9, 0xb9, 0xd0, 0x00, 0x3c, 0x00, 0xaf, 0xbf, 42 0xb6, 0xcb, 0x00, 0x4b, 0x00, 0xa8, 0xb9, 0xb5, 0xcc, 0x00, 0x52 }, 43 { 0xf9, 0x00, 0x13, 0xba, 0xb9, 0xcd, 0x00, 0x41, 0x00, 0xb0, 0xbe, 44 0xb5, 0xc9, 0x00, 0x51, 0x00, 0xa9, 0xb9, 0xb5, 0xca, 0x00, 0x57 }, 45 { 0xf9, 0x00, 0x13, 0xb9, 0xb8, 0xcd, 0x00, 0x46, 0x00, 0xb1, 0xbc, 46 0xb5, 0xc8, 0x00, 0x56, 0x00, 0xaa, 0xb8, 0xb4, 0xc9, 0x00, 0x5d }, 47 { 0xf9, 0x00, 0x13, 0xba, 0xb8, 0xcb, 0x00, 0x4b, 0x00, 0xb3, 0xbc, 48 0xb4, 0xc7, 0x00, 0x5c, 0x00, 0xac, 0xb8, 0xb4, 0xc8, 0x00, 0x62 }, 49 { 0xf9, 0x00, 0x13, 0xbb, 0xb7, 0xca, 0x00, 0x4f, 0x00, 0xb4, 0xbb, 50 0xb3, 0xc7, 0x00, 0x60, 0x00, 0xad, 0xb8, 0xb4, 0xc7, 0x00, 0x67 }, 51 { 0xf9, 0x00, 0x47, 0xba, 0xb6, 0xca, 0x00, 0x53, 0x00, 0xb5, 0xbb, 52 0xb3, 0xc6, 0x00, 0x65, 0x00, 0xae, 0xb8, 0xb3, 0xc7, 0x00, 0x6c }, 53 { 0xf9, 0x00, 0x71, 0xbb, 0xb5, 0xc8, 0x00, 0x57, 0x00, 0xb5, 0xbb, 54 0xb0, 0xc5, 0x00, 0x6a, 0x00, 0xae, 0xb9, 0xb1, 0xc6, 0x00, 0x70 }, 55 { 0xf9, 0x00, 0x7b, 0xbb, 0xb4, 0xc8, 0x00, 0x5b, 0x00, 0xb5, 0xba, 56 0xb1, 0xc4, 0x00, 0x6e, 0x00, 0xae, 0xb9, 0xb0, 0xc5, 0x00, 0x75 }, 57 { 0xf9, 0x00, 0x82, 0xba, 0xb4, 0xc7, 0x00, 0x5f, 0x00, 0xb5, 0xba, 58 0xb0, 0xc3, 0x00, 0x72, 0x00, 0xae, 0xb8, 0xb0, 0xc3, 0x00, 0x7a }, 59 { 0xf9, 0x00, 0x89, 0xba, 0xb3, 0xc8, 0x00, 0x62, 0x00, 0xb6, 0xba, 60 0xaf, 0xc3, 0x00, 0x76, 0x00, 0xaf, 0xb7, 0xae, 0xc4, 0x00, 0x7e }, 61 { 0xf9, 0x00, 0x8b, 0xb9, 0xb3, 0xc7, 0x00, 0x65, 0x00, 0xb7, 0xb8, 62 0xaf, 0xc3, 0x00, 0x7a, 0x00, 0x80, 0xb6, 0xae, 0xc4, 0x00, 0x81 }, 63 { 0xf9, 0x00, 0x93, 0xba, 0xb3, 0xc5, 0x00, 0x69, 0x00, 0xb8, 0xb9, 64 0xae, 0xc1, 0x00, 0x7f, 0x00, 0xb0, 0xb6, 0xae, 0xc3, 0x00, 0x85 }, 65 { 0xf9, 0x00, 0x97, 0xba, 0xb2, 0xc5, 0x00, 0x6c, 0x00, 0xb8, 0xb8, 66 0xae, 0xc1, 0x00, 0x82, 0x00, 0xb0, 0xb6, 0xae, 0xc2, 0x00, 0x89 }, 67 { 0xf9, 0x00, 0x9a, 0xba, 0xb1, 0xc4, 0x00, 0x6f, 0x00, 0xb8, 0xb8, 68 0xad, 0xc0, 0x00, 0x86, 0x00, 0xb0, 0xb7, 0xad, 0xc0, 0x00, 0x8d }, 69 { 0xf9, 0x00, 0x9c, 0xb9, 0xb0, 0xc4, 0x00, 0x72, 0x00, 0xb8, 0xb8, 70 0xac, 0xbf, 0x00, 0x8a, 0x00, 0xb0, 0xb6, 0xac, 0xc0, 0x00, 0x91 }, 71 { 0xf9, 0x00, 0x9e, 0xba, 0xb0, 0xc2, 0x00, 0x75, 0x00, 0xb9, 0xb8, 72 0xab, 0xbe, 0x00, 0x8e, 0x00, 0xb0, 0xb6, 0xac, 0xbf, 0x00, 0x94 }, 73 { 0xf9, 0x00, 0xa0, 0xb9, 0xaf, 0xc3, 0x00, 0x77, 0x00, 0xb9, 0xb7, 74 0xab, 0xbe, 0x00, 0x90, 0x00, 0xb0, 0xb6, 0xab, 0xbf, 0x00, 0x97 }, 75 { 0xf9, 0x00, 0xa2, 0xb9, 0xaf, 0xc2, 0x00, 0x7a, 0x00, 0xb9, 0xb7, 76 0xaa, 0xbd, 0x00, 0x94, 0x00, 0xb0, 0xb5, 0xab, 0xbf, 0x00, 0x9a }, 77 { 0xf9, 0x00, 0xa4, 0xb9, 0xaf, 0xc1, 0x00, 0x7d, 0x00, 0xb9, 0xb6, 78 0xaa, 0xbb, 0x00, 0x97, 0x00, 0xb1, 0xb5, 0xaa, 0xbf, 0x00, 0x9d }, 79 { 0xf9, 0x00, 0xa4, 0xb8, 0xb0, 0xbf, 0x00, 0x80, 0x00, 0xb8, 0xb6, 80 0xaa, 0xbc, 0x00, 0x9a, 0x00, 0xb0, 0xb5, 0xab, 0xbd, 0x00, 0xa0 }, 81 { 0xf9, 0x00, 0xa8, 0xb8, 0xae, 0xbe, 0x00, 0x84, 0x00, 0xb9, 0xb7, 82 0xa8, 0xbc, 0x00, 0x9d, 0x00, 0xb2, 0xb5, 0xaa, 0xbc, 0x00, 0xa4 }, 83 { 0xf9, 0x00, 0xa9, 0xb6, 0xad, 0xbf, 0x00, 0x86, 0x00, 0xb8, 0xb5, 84 0xa8, 0xbc, 0x00, 0xa0, 0x00, 0xb3, 0xb3, 0xa9, 0xbc, 0x00, 0xa7 }, 85 { 0xf9, 0x00, 0xa9, 0xb7, 0xae, 0xbd, 0x00, 0x89, 0x00, 0xb7, 0xb6, 86 0xa8, 0xba, 0x00, 0xa4, 0x00, 0xb1, 0xb4, 0xaa, 0xbb, 0x00, 0xaa }, 87 { 0xf9, 0x00, 0xa7, 0xb4, 0xae, 0xbf, 0x00, 0x91, 0x00, 0xb2, 0xb4, 88 0xaa, 0xbb, 0x00, 0xac, 0x00, 0xb3, 0xb1, 0xaa, 0xbc, 0x00, 0xb3 }, 89 }; 90 91 struct ld9040 { 92 struct device *dev; 93 struct drm_panel panel; 94 95 struct regulator_bulk_data supplies[2]; 96 struct gpio_desc *reset_gpio; 97 u32 power_on_delay; 98 u32 reset_delay; 99 struct videomode vm; 100 u32 width_mm; 101 u32 height_mm; 102 103 int brightness; 104 105 /* This field is tested by functions directly accessing bus before 106 * transfer, transfer is skipped if it is set. In case of transfer 107 * failure or unexpected response the field is set to error value. 108 * Such construct allows to eliminate many checks in higher level 109 * functions. 110 */ 111 int error; 112 }; 113 114 static inline struct ld9040 *panel_to_ld9040(struct drm_panel *panel) 115 { 116 return container_of(panel, struct ld9040, panel); 117 } 118 119 static int ld9040_clear_error(struct ld9040 *ctx) 120 { 121 int ret = ctx->error; 122 123 ctx->error = 0; 124 return ret; 125 } 126 127 static int ld9040_spi_write_word(struct ld9040 *ctx, u16 data) 128 { 129 struct spi_device *spi = to_spi_device(ctx->dev); 130 struct spi_transfer xfer = { 131 .len = 2, 132 .tx_buf = &data, 133 }; 134 struct spi_message msg; 135 136 spi_message_init(&msg); 137 spi_message_add_tail(&xfer, &msg); 138 139 return spi_sync(spi, &msg); 140 } 141 142 static void ld9040_dcs_write(struct ld9040 *ctx, const u8 *data, size_t len) 143 { 144 int ret = 0; 145 146 if (ctx->error < 0 || len == 0) 147 return; 148 149 dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data); 150 ret = ld9040_spi_write_word(ctx, *data); 151 152 while (!ret && --len) { 153 ++data; 154 ret = ld9040_spi_write_word(ctx, *data | 0x100); 155 } 156 157 if (ret) { 158 dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret, 159 (int)len, data); 160 ctx->error = ret; 161 } 162 163 usleep_range(300, 310); 164 } 165 166 #define ld9040_dcs_write_seq_static(ctx, seq...) \ 167 ({\ 168 static const u8 d[] = { seq };\ 169 ld9040_dcs_write(ctx, d, ARRAY_SIZE(d));\ 170 }) 171 172 static void ld9040_brightness_set(struct ld9040 *ctx) 173 { 174 ld9040_dcs_write(ctx, ld9040_gammas[ctx->brightness], 175 ARRAY_SIZE(ld9040_gammas[ctx->brightness])); 176 177 ld9040_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x02, 0x5a); 178 } 179 180 static void ld9040_init(struct ld9040 *ctx) 181 { 182 ld9040_dcs_write_seq_static(ctx, MCS_USER_SETTING, 0x5a, 0x5a); 183 ld9040_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION, 184 0x05, 0x65, 0x96, 0x71, 0x7d, 0x19, 0x3b, 0x0d, 185 0x19, 0x7e, 0x0d, 0xe2, 0x00, 0x00, 0x7e, 0x7d, 186 0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02); 187 ld9040_dcs_write_seq_static(ctx, MCS_DISPCTL, 188 0x02, 0x08, 0x08, 0x10, 0x10); 189 ld9040_dcs_write_seq_static(ctx, MCS_MANPWR, 0x04); 190 ld9040_dcs_write_seq_static(ctx, MCS_POWER_CTRL, 191 0x0a, 0x87, 0x25, 0x6a, 0x44, 0x02, 0x88); 192 ld9040_dcs_write_seq_static(ctx, MCS_ELVSS_ON, 0x0d, 0x00, 0x16); 193 ld9040_dcs_write_seq_static(ctx, MCS_GTCON, 0x09, 0x00, 0x00); 194 ld9040_brightness_set(ctx); 195 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE); 196 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON); 197 } 198 199 static int ld9040_power_on(struct ld9040 *ctx) 200 { 201 int ret; 202 203 ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 204 if (ret < 0) 205 return ret; 206 207 msleep(ctx->power_on_delay); 208 gpiod_set_value(ctx->reset_gpio, 0); 209 msleep(ctx->reset_delay); 210 gpiod_set_value(ctx->reset_gpio, 1); 211 msleep(ctx->reset_delay); 212 213 return 0; 214 } 215 216 static int ld9040_power_off(struct ld9040 *ctx) 217 { 218 return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 219 } 220 221 static int ld9040_disable(struct drm_panel *panel) 222 { 223 return 0; 224 } 225 226 static int ld9040_unprepare(struct drm_panel *panel) 227 { 228 struct ld9040 *ctx = panel_to_ld9040(panel); 229 230 msleep(120); 231 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF); 232 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE); 233 msleep(40); 234 235 ld9040_clear_error(ctx); 236 237 return ld9040_power_off(ctx); 238 } 239 240 static int ld9040_prepare(struct drm_panel *panel) 241 { 242 struct ld9040 *ctx = panel_to_ld9040(panel); 243 int ret; 244 245 ret = ld9040_power_on(ctx); 246 if (ret < 0) 247 return ret; 248 249 ld9040_init(ctx); 250 251 ret = ld9040_clear_error(ctx); 252 253 if (ret < 0) 254 ld9040_unprepare(panel); 255 256 return ret; 257 } 258 259 static int ld9040_enable(struct drm_panel *panel) 260 { 261 return 0; 262 } 263 264 static int ld9040_get_modes(struct drm_panel *panel) 265 { 266 struct drm_connector *connector = panel->connector; 267 struct ld9040 *ctx = panel_to_ld9040(panel); 268 struct drm_display_mode *mode; 269 270 mode = drm_mode_create(connector->dev); 271 if (!mode) { 272 DRM_ERROR("failed to create a new display mode\n"); 273 return 0; 274 } 275 276 drm_display_mode_from_videomode(&ctx->vm, mode); 277 mode->width_mm = ctx->width_mm; 278 mode->height_mm = ctx->height_mm; 279 connector->display_info.width_mm = mode->width_mm; 280 connector->display_info.height_mm = mode->height_mm; 281 282 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 283 drm_mode_probed_add(connector, mode); 284 285 return 1; 286 } 287 288 static const struct drm_panel_funcs ld9040_drm_funcs = { 289 .disable = ld9040_disable, 290 .unprepare = ld9040_unprepare, 291 .prepare = ld9040_prepare, 292 .enable = ld9040_enable, 293 .get_modes = ld9040_get_modes, 294 }; 295 296 static int ld9040_parse_dt(struct ld9040 *ctx) 297 { 298 struct device *dev = ctx->dev; 299 struct device_node *np = dev->of_node; 300 int ret; 301 302 ret = of_get_videomode(np, &ctx->vm, 0); 303 if (ret < 0) 304 return ret; 305 306 of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay); 307 of_property_read_u32(np, "reset-delay", &ctx->reset_delay); 308 of_property_read_u32(np, "panel-width-mm", &ctx->width_mm); 309 of_property_read_u32(np, "panel-height-mm", &ctx->height_mm); 310 311 return 0; 312 } 313 314 static int ld9040_probe(struct spi_device *spi) 315 { 316 struct device *dev = &spi->dev; 317 struct ld9040 *ctx; 318 int ret; 319 320 ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL); 321 if (!ctx) 322 return -ENOMEM; 323 324 spi_set_drvdata(spi, ctx); 325 326 ctx->dev = dev; 327 ctx->brightness = ARRAY_SIZE(ld9040_gammas) - 1; 328 329 ret = ld9040_parse_dt(ctx); 330 if (ret < 0) 331 return ret; 332 333 ctx->supplies[0].supply = "vdd3"; 334 ctx->supplies[1].supply = "vci"; 335 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies), 336 ctx->supplies); 337 if (ret < 0) 338 return ret; 339 340 ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 341 if (IS_ERR(ctx->reset_gpio)) { 342 dev_err(dev, "cannot get reset-gpios %ld\n", 343 PTR_ERR(ctx->reset_gpio)); 344 return PTR_ERR(ctx->reset_gpio); 345 } 346 347 spi->bits_per_word = 9; 348 ret = spi_setup(spi); 349 if (ret < 0) { 350 dev_err(dev, "spi setup failed.\n"); 351 return ret; 352 } 353 354 drm_panel_init(&ctx->panel, dev, &ld9040_drm_funcs, 355 DRM_MODE_CONNECTOR_DPI); 356 357 return drm_panel_add(&ctx->panel); 358 } 359 360 static int ld9040_remove(struct spi_device *spi) 361 { 362 struct ld9040 *ctx = spi_get_drvdata(spi); 363 364 ld9040_power_off(ctx); 365 drm_panel_remove(&ctx->panel); 366 367 return 0; 368 } 369 370 static const struct of_device_id ld9040_of_match[] = { 371 { .compatible = "samsung,ld9040" }, 372 { } 373 }; 374 MODULE_DEVICE_TABLE(of, ld9040_of_match); 375 376 static struct spi_driver ld9040_driver = { 377 .probe = ld9040_probe, 378 .remove = ld9040_remove, 379 .driver = { 380 .name = "panel-samsung-ld9040", 381 .of_match_table = ld9040_of_match, 382 }, 383 }; 384 module_spi_driver(ld9040_driver); 385 386 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>"); 387 MODULE_DESCRIPTION("ld9040 LCD Driver"); 388 MODULE_LICENSE("GPL v2"); 389