drivers/gpu/drm/panel/panel-samsung-ld9040.c

   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                             struct drm_connector *connector)
 266 {
 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");