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         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         regulator_disable(ctx->iovcc);
 108         regulator_disable(ctx->vdd);
 109
 110         ctx->prepared = false;
 111
 112         return 0;
 113 }
 114
 115 static int kd35t133_prepare(struct drm_panel *panel)
 116 {
 117         struct kd35t133 *ctx = panel_to_kd35t133(panel);
 118         struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 119         int ret;
 120
 121         if (ctx->prepared)
 122                 return 0;
 123
 124         dev_dbg(ctx->dev, "Resetting the panel\n");
 125         ret = regulator_enable(ctx->vdd);
 126         if (ret < 0) {
 127                 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
 128                 return ret;
 129         }
 130
 131         ret = regulator_enable(ctx->iovcc);
 132         if (ret < 0) {
 133                 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
 134                 goto disable_vdd;
 135         }
 136
 137         msleep(20);
 138
 139         gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 140         usleep_range(10, 20);
 141         gpiod_set_value_cansleep(ctx->reset_gpio, 0);
 142
 143         msleep(20);
 144
 145         ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 146         if (ret < 0) {
 147                 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
 148                 goto disable_iovcc;
 149         }
 150
 151         msleep(250);
 152
 153         ret = kd35t133_init_sequence(ctx);
 154         if (ret < 0) {
 155                 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
 156                 goto disable_iovcc;
 157         }
 158
 159         ret = mipi_dsi_dcs_set_display_on(dsi);
 160         if (ret < 0) {
 161                 dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
 162                 goto disable_iovcc;
 163         }
 164
 165         msleep(50);
 166
 167         ctx->prepared = true;
 168
 169         return 0;
 170
 171 disable_iovcc:
 172         regulator_disable(ctx->iovcc);
 173 disable_vdd:
 174         regulator_disable(ctx->vdd);
 175         return ret;
 176 }
 177
 178 static const struct drm_display_mode default_mode = {
 179         .hdisplay       = 320,
 180         .hsync_start    = 320 + 130,
 181         .hsync_end      = 320 + 130 + 4,
 182         .htotal         = 320 + 130 + 4 + 130,
 183         .vdisplay       = 480,
 184         .vsync_start    = 480 + 2,
 185         .vsync_end      = 480 + 2 + 1,
 186         .vtotal         = 480 + 2 + 1 + 2,
 187         .clock          = 17000,
 188         .width_mm       = 42,
 189         .height_mm      = 82,
 190 };
 191
 192 static int kd35t133_get_modes(struct drm_panel *panel,
 193                                 struct drm_connector *connector)
 194 {
 195         struct kd35t133 *ctx = panel_to_kd35t133(panel);
 196         struct drm_display_mode *mode;
 197
 198         mode = drm_mode_duplicate(connector->dev, &default_mode);
 199         if (!mode) {
 200                 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
 201                         default_mode.hdisplay, default_mode.vdisplay,
 202                         drm_mode_vrefresh(&default_mode));
 203                 return -ENOMEM;
 204         }
 205
 206         drm_mode_set_name(mode);
 207
 208         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 209         connector->display_info.width_mm = mode->width_mm;
 210         connector->display_info.height_mm = mode->height_mm;
 211         drm_mode_probed_add(connector, mode);
 212         /*
 213          * TODO: Remove once all drm drivers call
 214          * drm_connector_set_orientation_from_panel()
 215          */
 216         drm_connector_set_panel_orientation(connector, ctx->orientation);
 217
 218         return 1;
 219 }
 220
 221 static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel)
 222 {
 223         struct kd35t133 *ctx = panel_to_kd35t133(panel);
 224
 225         return ctx->orientation;
 226 }
 227
 228 static const struct drm_panel_funcs kd35t133_funcs = {
 229         .unprepare      = kd35t133_unprepare,
 230         .prepare        = kd35t133_prepare,
 231         .get_modes      = kd35t133_get_modes,
 232         .get_orientation = kd35t133_get_orientation,
 233 };
 234
 235 static int kd35t133_probe(struct mipi_dsi_device *dsi)
 236 {
 237         struct device *dev = &dsi->dev;
 238         struct kd35t133 *ctx;
 239         int ret;
 240
 241         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 242         if (!ctx)
 243                 return -ENOMEM;
 244
 245         ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 246         if (IS_ERR(ctx->reset_gpio)) {
 247                 dev_err(dev, "cannot get reset gpio\n");
 248                 return PTR_ERR(ctx->reset_gpio);
 249         }
 250
 251         ctx->vdd = devm_regulator_get(dev, "vdd");
 252         if (IS_ERR(ctx->vdd)) {
 253                 ret = PTR_ERR(ctx->vdd);
 254                 if (ret != -EPROBE_DEFER)
 255                         dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
 256                 return ret;
 257         }
 258
 259         ctx->iovcc = devm_regulator_get(dev, "iovcc");
 260         if (IS_ERR(ctx->iovcc)) {
 261                 ret = PTR_ERR(ctx->iovcc);
 262                 if (ret != -EPROBE_DEFER)
 263                         dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
 264                 return ret;
 265         }
 266
 267         ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
 268         if (ret < 0) {
 269                 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
 270                 return ret;
 271         }
 272
 273         mipi_dsi_set_drvdata(dsi, ctx);
 274
 275         ctx->dev = dev;
 276
 277         dsi->lanes = 1;
 278         dsi->format = MIPI_DSI_FMT_RGB888;
 279         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
 280                           MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET |
 281                           MIPI_DSI_CLOCK_NON_CONTINUOUS;
 282
 283         drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
 284                        DRM_MODE_CONNECTOR_DSI);
 285
 286         ret = drm_panel_of_backlight(&ctx->panel);
 287         if (ret)
 288                 return ret;
 289
 290         drm_panel_add(&ctx->panel);
 291
 292         ret = mipi_dsi_attach(dsi);
 293         if (ret < 0) {
 294                 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
 295                 drm_panel_remove(&ctx->panel);
 296                 return ret;
 297         }
 298
 299         return 0;
 300 }
 301
 302 static void kd35t133_shutdown(struct mipi_dsi_device *dsi)
 303 {
 304         struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
 305         int ret;
 306
 307         ret = drm_panel_unprepare(&ctx->panel);
 308         if (ret < 0)
 309                 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
 310
 311         ret = drm_panel_disable(&ctx->panel);
 312         if (ret < 0)
 313                 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
 314 }
 315
 316 static void kd35t133_remove(struct mipi_dsi_device *dsi)
 317 {
 318         struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
 319         int ret;
 320
 321         kd35t133_shutdown(dsi);
 322
 323         ret = mipi_dsi_detach(dsi);
 324         if (ret < 0)
 325                 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
 326
 327         drm_panel_remove(&ctx->panel);
 328 }
 329
 330 static const struct of_device_id kd35t133_of_match[] = {
 331         { .compatible = "elida,kd35t133" },
 332         { /* sentinel */ }
 333 };
 334 MODULE_DEVICE_TABLE(of, kd35t133_of_match);
 335
 336 static struct mipi_dsi_driver kd35t133_driver = {
 337         .driver = {
 338                 .name = "panel-elida-kd35t133",
 339                 .of_match_table = kd35t133_of_match,
 340         },
 341         .probe  = kd35t133_probe,
 342         .remove = kd35t133_remove,
 343         .shutdown = kd35t133_shutdown,
 344 };
 345 module_mipi_dsi_driver(kd35t133_driver);
 346
 347 MODULE_AUTHOR("Heiko Stuebner <[email protected]>");
 348 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
 349 MODULE_LICENSE("GPL v2");