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