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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Elida kd35t133 3.5" 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         enum drm_panel_orientation orientation;
  46         bool prepared;
  47 };
  48
  49 static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
  50 {
  51         return container_of(panel, struct kd35t133, panel);
  52 }
  53
  54 static int kd35t133_init_sequence(struct kd35t133 *ctx)
  55 {
  56         struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
  57         struct device *dev = ctx->dev;
  58
  59         /*
  60          * Init sequence was supplied by the panel vendor with minimal
  61          * documentation.
  62          */
  63         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA,
  64                                0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
  65                                0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
  66         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA,
  67                                0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
  68                                0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
  69         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
  70         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41);
  71         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
  72         mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
  73         mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
  74         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
  75         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0);
  76         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
  77         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
  78                                0x20, 0x02);
  79         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
  80         mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3,
  81                                0xa9, 0x51, 0x2c, 0x82);
  82         mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
  83
  84         dev_dbg(dev, "Panel init sequence done\n");
  85         return 0;
  86 }
  87
  88 static int kd35t133_unprepare(struct drm_panel *panel)
  89 {
  90         struct kd35t133 *ctx = panel_to_kd35t133(panel);
  91         struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
  92         int ret;
  93
  94         if (!ctx->prepared)
  95                 return 0;
  96
  97         ret = mipi_dsi_dcs_set_display_off(dsi);
  98         if (ret < 0)
  99                 dev_err(ctx->dev, "failed to set display off: %d\n", ret);
 100
 101         ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
 102         if (ret < 0) {
 103                 dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret);
 104                 return ret;
 105         }
 106
 107         gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 108
 109         regulator_disable(ctx->iovcc);
 110         regulator_disable(ctx->vdd);
 111
 112         ctx->prepared = false;
 113
 114         return 0;
 115 }
 116
 117 static int kd35t133_prepare(struct drm_panel *panel)
 118 {
 119         struct kd35t133 *ctx = panel_to_kd35t133(panel);
 120         struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 121         int ret;
 122
 123         if (ctx->prepared)
 124                 return 0;
 125
 126         dev_dbg(ctx->dev, "Resetting the panel\n");
 127         ret = regulator_enable(ctx->vdd);
 128         if (ret < 0) {
 129                 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
 130                 return ret;
 131         }
 132
 133         ret = regulator_enable(ctx->iovcc);
 134         if (ret < 0) {
 135                 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
 136                 goto disable_vdd;
 137         }
 138
 139         msleep(20);
 140
 141         gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 142         usleep_range(10, 20);
 143         gpiod_set_value_cansleep(ctx->reset_gpio, 0);
 144
 145         msleep(20);
 146
 147         ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 148         if (ret < 0) {
 149                 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
 150                 goto disable_iovcc;
 151         }
 152
 153         msleep(250);
 154
 155         ret = kd35t133_init_sequence(ctx);
 156         if (ret < 0) {
 157                 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
 158                 goto disable_iovcc;
 159         }
 160
 161         ret = mipi_dsi_dcs_set_display_on(dsi);
 162         if (ret < 0) {
 163                 dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
 164                 goto disable_iovcc;
 165         }
 166
 167         msleep(50);
 168
 169         ctx->prepared = true;
 170
 171         return 0;
 172
 173 disable_iovcc:
 174         regulator_disable(ctx->iovcc);
 175 disable_vdd:
 176         regulator_disable(ctx->vdd);
 177         return ret;
 178 }
 179
 180 static const struct drm_display_mode default_mode = {
 181         .hdisplay       = 320,
 182         .hsync_start    = 320 + 130,
 183         .hsync_end      = 320 + 130 + 4,
 184         .htotal         = 320 + 130 + 4 + 130,
 185         .vdisplay       = 480,
 186         .vsync_start    = 480 + 2,
 187         .vsync_end      = 480 + 2 + 1,
 188         .vtotal         = 480 + 2 + 1 + 2,
 189         .clock          = 17000,
 190         .width_mm       = 42,
 191         .height_mm      = 82,
 192 };
 193
 194 static int kd35t133_get_modes(struct drm_panel *panel,
 195                                 struct drm_connector *connector)
 196 {
 197         struct kd35t133 *ctx = panel_to_kd35t133(panel);
 198         struct drm_display_mode *mode;
 199
 200         mode = drm_mode_duplicate(connector->dev, &default_mode);
 201         if (!mode) {
 202                 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
 203                         default_mode.hdisplay, default_mode.vdisplay,
 204                         drm_mode_vrefresh(&default_mode));
 205                 return -ENOMEM;
 206         }
 207
 208         drm_mode_set_name(mode);
 209
 210         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 211         connector->display_info.width_mm = mode->width_mm;
 212         connector->display_info.height_mm = mode->height_mm;
 213         drm_mode_probed_add(connector, mode);
 214
 215         return 1;
 216 }
 217
 218 static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel)
 219 {
 220         struct kd35t133 *ctx = panel_to_kd35t133(panel);
 221
 222         return ctx->orientation;
 223 }
 224
 225 static const struct drm_panel_funcs kd35t133_funcs = {
 226         .unprepare      = kd35t133_unprepare,
 227         .prepare        = kd35t133_prepare,
 228         .get_modes      = kd35t133_get_modes,
 229         .get_orientation = kd35t133_get_orientation,
 230 };
 231
 232 static int kd35t133_probe(struct mipi_dsi_device *dsi)
 233 {
 234         struct device *dev = &dsi->dev;
 235         struct kd35t133 *ctx;
 236         int ret;
 237
 238         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 239         if (!ctx)
 240                 return -ENOMEM;
 241
 242         ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 243         if (IS_ERR(ctx->reset_gpio)) {
 244                 dev_err(dev, "cannot get reset gpio\n");
 245                 return PTR_ERR(ctx->reset_gpio);
 246         }
 247
 248         ctx->vdd = devm_regulator_get(dev, "vdd");
 249         if (IS_ERR(ctx->vdd)) {
 250                 ret = PTR_ERR(ctx->vdd);
 251                 if (ret != -EPROBE_DEFER)
 252                         dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
 253                 return ret;
 254         }
 255
 256         ctx->iovcc = devm_regulator_get(dev, "iovcc");
 257         if (IS_ERR(ctx->iovcc)) {
 258                 ret = PTR_ERR(ctx->iovcc);
 259                 if (ret != -EPROBE_DEFER)
 260                         dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
 261                 return ret;
 262         }
 263
 264         ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
 265         if (ret < 0) {
 266                 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
 267                 return ret;
 268         }
 269
 270         mipi_dsi_set_drvdata(dsi, ctx);
 271
 272         ctx->dev = dev;
 273
 274         dsi->lanes = 1;
 275         dsi->format = MIPI_DSI_FMT_RGB888;
 276         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
 277                           MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET |
 278                           MIPI_DSI_CLOCK_NON_CONTINUOUS;
 279
 280         drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
 281                        DRM_MODE_CONNECTOR_DSI);
 282
 283         ret = drm_panel_of_backlight(&ctx->panel);
 284         if (ret)
 285                 return ret;
 286
 287         drm_panel_add(&ctx->panel);
 288
 289         ret = mipi_dsi_attach(dsi);
 290         if (ret < 0) {
 291                 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
 292                 drm_panel_remove(&ctx->panel);
 293                 return ret;
 294         }
 295
 296         return 0;
 297 }
 298
 299 static void kd35t133_remove(struct mipi_dsi_device *dsi)
 300 {
 301         struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
 302         int ret;
 303
 304         ret = mipi_dsi_detach(dsi);
 305         if (ret < 0)
 306                 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
 307
 308         drm_panel_remove(&ctx->panel);
 309 }
 310
 311 static const struct of_device_id kd35t133_of_match[] = {
 312         { .compatible = "elida,kd35t133" },
 313         { /* sentinel */ }
 314 };
 315 MODULE_DEVICE_TABLE(of, kd35t133_of_match);
 316
 317 static struct mipi_dsi_driver kd35t133_driver = {
 318         .driver = {
 319                 .name = "panel-elida-kd35t133",
 320                 .of_match_table = kd35t133_of_match,
 321         },
 322         .probe  = kd35t133_probe,
 323         .remove = kd35t133_remove,
 324 };
 325 module_mipi_dsi_driver(kd35t133_driver);
 326
 327 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
 328 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
 329 MODULE_LICENSE("GPL v2");