drivers/gpu/drm/panel/panel-elida-kd35t133.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Elida kd35t133 5.5" MIPI-DSI panel driver
   4  * Copyright (C) 2020 Theobroma Systems Design und Consulting GmbH
   5  *
   6  * based on
   7  *
   8  * Rockteck jh057n00900 5.5" MIPI-DSI panel driver
   9  * Copyright (C) Purism SPC 2019
  10  */
  11
  12 #include <linux/delay.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/media-bus-format.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/regulator/consumer.h>
  18
  19 #include <video/display_timing.h>
  20 #include <video/mipi_display.h>
  21
  22 #include <drm/drm_mipi_dsi.h>
  23 #include <drm/drm_modes.h>
  24 #include <drm/drm_panel.h>
  25
  26 /* Manufacturer specific Commands send via DSI */
  27 #define KD35T133_CMD_INTERFACEMODECTRL          0xb0
  28 #define KD35T133_CMD_FRAMERATECTRL              0xb1
  29 #define KD35T133_CMD_DISPLAYINVERSIONCTRL       0xb4
  30 #define KD35T133_CMD_DISPLAYFUNCTIONCTRL        0xb6
  31 #define KD35T133_CMD_POWERCONTROL1              0xc0
  32 #define KD35T133_CMD_POWERCONTROL2              0xc1
  33 #define KD35T133_CMD_VCOMCONTROL                0xc5
  34 #define KD35T133_CMD_POSITIVEGAMMA              0xe0
  35 #define KD35T133_CMD_NEGATIVEGAMMA              0xe1
  36 #define KD35T133_CMD_SETIMAGEFUNCTION           0xe9
  37 #define KD35T133_CMD_ADJUSTCONTROL3             0xf7
  38
  39 struct kd35t133 {
  40         struct device *dev;
  41         struct drm_panel panel;
  42         struct gpio_desc *reset_gpio;
  43         struct regulator *vdd;
  44         struct regulator *iovcc;
  45         bool prepared;
  46 };
  47
  48 static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
  49 {
  50         return container_of(panel, struct kd35t133, panel);
  51 }
  52
  53 #define dsi_dcs_write_seq(dsi, cmd, seq...) do {                        \
  54                 static const u8 b[] = { cmd, seq };                     \
  55                 int ret;                                                \
  56                 ret = mipi_dsi_dcs_write_buffer(dsi, b, ARRAY_SIZE(b)); \
  57                 if (ret < 0)                                            \
  58                         return ret;                                     \
  59         } while (0)
  60
  61 static int kd35t133_init_sequence(struct kd35t133 *ctx)
  62 {
  63         struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
  64         struct device *dev = ctx->dev;
  65
  66         /*
  67          * Init sequence was supplied by the panel vendor with minimal
  68          * documentation.
  69          */
  70         dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA,
  71                           0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
  72                           0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
  73         dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA,
  74                           0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
  75                           0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
  76         dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
  77         dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41);
  78         dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
  79         dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
  80         dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
  81         dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
  82         dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0);
  83         dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
  84         dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
  85                           0x20, 0x02);
  86         dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
  87         dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3,
  88                           0xa9, 0x51, 0x2c, 0x82);
  89         mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
  90
  91         dev_dbg(dev, "Panel init sequence done\n");
  92         return 0;
  93 }
  94
  95 static int kd35t133_unprepare(struct drm_panel *panel)
  96 {
  97         struct kd35t133 *ctx = panel_to_kd35t133(panel);
  98         struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
  99         int ret;
 100
 101         if (!ctx->prepared)
 102                 return 0;
 103
 104         ret = mipi_dsi_dcs_set_display_off(dsi);
 105         if (ret < 0)
 106                 dev_err(ctx->dev, "failed to set display off: %d\n", ret);
 107
 108         ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
 109         if (ret < 0) {
 110                 dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret);
 111                 return ret;
 112         }
 113
 114         regulator_disable(ctx->iovcc);
 115         regulator_disable(ctx->vdd);
 116
 117         ctx->prepared = false;
 118
 119         return 0;
 120 }
 121
 122 static int kd35t133_prepare(struct drm_panel *panel)
 123 {
 124         struct kd35t133 *ctx = panel_to_kd35t133(panel);
 125         struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 126         int ret;
 127
 128         if (ctx->prepared)
 129                 return 0;
 130
 131         dev_dbg(ctx->dev, "Resetting the panel\n");
 132         ret = regulator_enable(ctx->vdd);
 133         if (ret < 0) {
 134                 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
 135                 return ret;
 136         }
 137
 138         ret = regulator_enable(ctx->iovcc);
 139         if (ret < 0) {
 140                 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
 141                 goto disable_vdd;
 142         }
 143
 144         msleep(20);
 145
 146         gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 147         usleep_range(10, 20);
 148         gpiod_set_value_cansleep(ctx->reset_gpio, 0);
 149
 150         msleep(20);
 151
 152         ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 153         if (ret < 0) {
 154                 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
 155                 goto disable_iovcc;
 156         }
 157
 158         msleep(250);
 159
 160         ret = kd35t133_init_sequence(ctx);
 161         if (ret < 0) {
 162                 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
 163                 goto disable_iovcc;
 164         }
 165
 166         ret = mipi_dsi_dcs_set_display_on(dsi);
 167         if (ret < 0) {
 168                 dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
 169                 goto disable_iovcc;
 170         }
 171
 172         msleep(50);
 173
 174         ctx->prepared = true;
 175
 176         return 0;
 177
 178 disable_iovcc:
 179         regulator_disable(ctx->iovcc);
 180 disable_vdd:
 181         regulator_disable(ctx->vdd);
 182         return ret;
 183 }
 184
 185 static const struct drm_display_mode default_mode = {
 186         .hdisplay       = 320,
 187         .hsync_start    = 320 + 130,
 188         .hsync_end      = 320 + 130 + 4,
 189         .htotal         = 320 + 130 + 4 + 130,
 190         .vdisplay       = 480,
 191         .vsync_start    = 480 + 2,
 192         .vsync_end      = 480 + 2 + 1,
 193         .vtotal         = 480 + 2 + 1 + 2,
 194         .clock          = 17000,
 195         .width_mm       = 42,
 196         .height_mm      = 82,
 197 };
 198
 199 static int kd35t133_get_modes(struct drm_panel *panel,
 200                                 struct drm_connector *connector)
 201 {
 202         struct kd35t133 *ctx = panel_to_kd35t133(panel);
 203         struct drm_display_mode *mode;
 204
 205         mode = drm_mode_duplicate(connector->dev, &default_mode);
 206         if (!mode) {
 207                 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
 208                         default_mode.hdisplay, default_mode.vdisplay,
 209                         drm_mode_vrefresh(&default_mode));
 210                 return -ENOMEM;
 211         }
 212
 213         drm_mode_set_name(mode);
 214
 215         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 216         connector->display_info.width_mm = mode->width_mm;
 217         connector->display_info.height_mm = mode->height_mm;
 218         drm_mode_probed_add(connector, mode);
 219
 220         return 1;
 221 }
 222
 223 static const struct drm_panel_funcs kd35t133_funcs = {
 224         .unprepare      = kd35t133_unprepare,
 225         .prepare        = kd35t133_prepare,
 226         .get_modes      = kd35t133_get_modes,
 227 };
 228
 229 static int kd35t133_probe(struct mipi_dsi_device *dsi)
 230 {
 231         struct device *dev = &dsi->dev;
 232         struct kd35t133 *ctx;
 233         int ret;
 234
 235         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 236         if (!ctx)
 237                 return -ENOMEM;
 238
 239         ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 240         if (IS_ERR(ctx->reset_gpio)) {
 241                 dev_err(dev, "cannot get reset gpio\n");
 242                 return PTR_ERR(ctx->reset_gpio);
 243         }
 244
 245         ctx->vdd = devm_regulator_get(dev, "vdd");
 246         if (IS_ERR(ctx->vdd)) {
 247                 ret = PTR_ERR(ctx->vdd);
 248                 if (ret != -EPROBE_DEFER)
 249                         dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
 250                 return ret;
 251         }
 252
 253         ctx->iovcc = devm_regulator_get(dev, "iovcc");
 254         if (IS_ERR(ctx->iovcc)) {
 255                 ret = PTR_ERR(ctx->iovcc);
 256                 if (ret != -EPROBE_DEFER)
 257                         dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
 258                 return ret;
 259         }
 260
 261         mipi_dsi_set_drvdata(dsi, ctx);
 262
 263         ctx->dev = dev;
 264
 265         dsi->lanes = 1;
 266         dsi->format = MIPI_DSI_FMT_RGB888;
 267         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
 268                           MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET;
 269
 270         drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
 271                        DRM_MODE_CONNECTOR_DSI);
 272
 273         ret = drm_panel_of_backlight(&ctx->panel);
 274         if (ret)
 275                 return ret;
 276
 277         drm_panel_add(&ctx->panel);
 278
 279         ret = mipi_dsi_attach(dsi);
 280         if (ret < 0) {
 281                 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
 282                 drm_panel_remove(&ctx->panel);
 283                 return ret;
 284         }
 285
 286         return 0;
 287 }
 288
 289 static void kd35t133_shutdown(struct mipi_dsi_device *dsi)
 290 {
 291         struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
 292         int ret;
 293
 294         ret = drm_panel_unprepare(&ctx->panel);
 295         if (ret < 0)
 296                 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
 297
 298         ret = drm_panel_disable(&ctx->panel);
 299         if (ret < 0)
 300                 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
 301 }
 302
 303 static int kd35t133_remove(struct mipi_dsi_device *dsi)
 304 {
 305         struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
 306         int ret;
 307
 308         kd35t133_shutdown(dsi);
 309
 310         ret = mipi_dsi_detach(dsi);
 311         if (ret < 0)
 312                 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
 313
 314         drm_panel_remove(&ctx->panel);
 315
 316         return 0;
 317 }
 318
 319 static const struct of_device_id kd35t133_of_match[] = {
 320         { .compatible = "elida,kd35t133" },
 321         { /* sentinel */ }
 322 };
 323 MODULE_DEVICE_TABLE(of, kd35t133_of_match);
 324
 325 static struct mipi_dsi_driver kd35t133_driver = {
 326         .driver = {
 327                 .name = "panel-elida-kd35t133",
 328                 .of_match_table = kd35t133_of_match,
 329         },
 330         .probe  = kd35t133_probe,
 331         .remove = kd35t133_remove,
 332         .shutdown = kd35t133_shutdown,
 333 };
 334 module_mipi_dsi_driver(kd35t133_driver);
 335
 336 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
 337 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
 338 MODULE_LICENSE("GPL v2");