drivers/gpu/drm/panel/panel-seiko-43wvf1g.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2017 NXP Semiconductors.
   4  * Author: Marco Franchi <marco.franchi@nxp.com>
   5  *
   6  * Based on Panel Simple driver by Thierry Reding <treding@nvidia.com>
   7  */
   8
   9 #include <linux/backlight.h>
  10 #include <linux/delay.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regulator/consumer.h>
  15
  16 #include <video/display_timing.h>
  17 #include <video/videomode.h>
  18
  19 #include <drm/drm_crtc.h>
  20 #include <drm/drm_device.h>
  21 #include <drm/drm_panel.h>
  22
  23 struct seiko_panel_desc {
  24         const struct drm_display_mode *modes;
  25         unsigned int num_modes;
  26         const struct display_timing *timings;
  27         unsigned int num_timings;
  28
  29         unsigned int bpc;
  30
  31         /**
  32          * @width: width (in millimeters) of the panel's active display area
  33          * @height: height (in millimeters) of the panel's active display area
  34          */
  35         struct {
  36                 unsigned int width;
  37                 unsigned int height;
  38         } size;
  39
  40         u32 bus_format;
  41         u32 bus_flags;
  42 };
  43
  44 struct seiko_panel {
  45         struct drm_panel base;
  46         bool prepared;
  47         bool enabled;
  48         const struct seiko_panel_desc *desc;
  49         struct backlight_device *backlight;
  50         struct regulator *dvdd;
  51         struct regulator *avdd;
  52 };
  53
  54 static inline struct seiko_panel *to_seiko_panel(struct drm_panel *panel)
  55 {
  56         return container_of(panel, struct seiko_panel, base);
  57 }
  58
  59 static int seiko_panel_get_fixed_modes(struct seiko_panel *panel,
  60                                        struct drm_connector *connector)
  61 {
  62         struct drm_display_mode *mode;
  63         unsigned int i, num = 0;
  64
  65         if (!panel->desc)
  66                 return 0;
  67
  68         for (i = 0; i < panel->desc->num_timings; i++) {
  69                 const struct display_timing *dt = &panel->desc->timings[i];
  70                 struct videomode vm;
  71
  72                 videomode_from_timing(dt, &vm);
  73                 mode = drm_mode_create(connector->dev);
  74                 if (!mode) {
  75                         dev_err(panel->base.dev, "failed to add mode %ux%u\n",
  76                                 dt->hactive.typ, dt->vactive.typ);
  77                         continue;
  78                 }
  79
  80                 drm_display_mode_from_videomode(&vm, mode);
  81
  82                 mode->type |= DRM_MODE_TYPE_DRIVER;
  83
  84                 if (panel->desc->num_timings == 1)
  85                         mode->type |= DRM_MODE_TYPE_PREFERRED;
  86
  87                 drm_mode_probed_add(connector, mode);
  88                 num++;
  89         }
  90
  91         for (i = 0; i < panel->desc->num_modes; i++) {
  92                 const struct drm_display_mode *m = &panel->desc->modes[i];
  93
  94                 mode = drm_mode_duplicate(connector->dev, m);
  95                 if (!mode) {
  96                         dev_err(panel->base.dev, "failed to add mode %ux%u@%u\n",
  97                                 m->hdisplay, m->vdisplay, m->vrefresh);
  98                         continue;
  99                 }
 100
 101                 mode->type |= DRM_MODE_TYPE_DRIVER;
 102
 103                 if (panel->desc->num_modes == 1)
 104                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 105
 106                 drm_mode_set_name(mode);
 107
 108                 drm_mode_probed_add(connector, mode);
 109                 num++;
 110         }
 111
 112         connector->display_info.bpc = panel->desc->bpc;
 113         connector->display_info.width_mm = panel->desc->size.width;
 114         connector->display_info.height_mm = panel->desc->size.height;
 115         if (panel->desc->bus_format)
 116                 drm_display_info_set_bus_formats(&connector->display_info,
 117                                                  &panel->desc->bus_format, 1);
 118         connector->display_info.bus_flags = panel->desc->bus_flags;
 119
 120         return num;
 121 }
 122
 123 static int seiko_panel_disable(struct drm_panel *panel)
 124 {
 125         struct seiko_panel *p = to_seiko_panel(panel);
 126
 127         if (!p->enabled)
 128                 return 0;
 129
 130         if (p->backlight) {
 131                 p->backlight->props.power = FB_BLANK_POWERDOWN;
 132                 p->backlight->props.state |= BL_CORE_FBBLANK;
 133                 backlight_update_status(p->backlight);
 134         }
 135
 136         p->enabled = false;
 137
 138         return 0;
 139 }
 140
 141 static int seiko_panel_unprepare(struct drm_panel *panel)
 142 {
 143         struct seiko_panel *p = to_seiko_panel(panel);
 144
 145         if (!p->prepared)
 146                 return 0;
 147
 148         regulator_disable(p->avdd);
 149
 150         /* Add a 100ms delay as per the panel datasheet */
 151         msleep(100);
 152
 153         regulator_disable(p->dvdd);
 154
 155         p->prepared = false;
 156
 157         return 0;
 158 }
 159
 160 static int seiko_panel_prepare(struct drm_panel *panel)
 161 {
 162         struct seiko_panel *p = to_seiko_panel(panel);
 163         int err;
 164
 165         if (p->prepared)
 166                 return 0;
 167
 168         err = regulator_enable(p->dvdd);
 169         if (err < 0) {
 170                 dev_err(panel->dev, "failed to enable dvdd: %d\n", err);
 171                 return err;
 172         }
 173
 174         /* Add a 100ms delay as per the panel datasheet */
 175         msleep(100);
 176
 177         err = regulator_enable(p->avdd);
 178         if (err < 0) {
 179                 dev_err(panel->dev, "failed to enable avdd: %d\n", err);
 180                 goto disable_dvdd;
 181         }
 182
 183         p->prepared = true;
 184
 185         return 0;
 186
 187 disable_dvdd:
 188         regulator_disable(p->dvdd);
 189         return err;
 190 }
 191
 192 static int seiko_panel_enable(struct drm_panel *panel)
 193 {
 194         struct seiko_panel *p = to_seiko_panel(panel);
 195
 196         if (p->enabled)
 197                 return 0;
 198
 199         if (p->backlight) {
 200                 p->backlight->props.state &= ~BL_CORE_FBBLANK;
 201                 p->backlight->props.power = FB_BLANK_UNBLANK;
 202                 backlight_update_status(p->backlight);
 203         }
 204
 205         p->enabled = true;
 206
 207         return 0;
 208 }
 209
 210 static int seiko_panel_get_modes(struct drm_panel *panel,
 211                                  struct drm_connector *connector)
 212 {
 213         struct seiko_panel *p = to_seiko_panel(panel);
 214
 215         /* add hard-coded panel modes */
 216         return seiko_panel_get_fixed_modes(p, connector);
 217 }
 218
 219 static int seiko_panel_get_timings(struct drm_panel *panel,
 220                                     unsigned int num_timings,
 221                                     struct display_timing *timings)
 222 {
 223         struct seiko_panel *p = to_seiko_panel(panel);
 224         unsigned int i;
 225
 226         if (p->desc->num_timings < num_timings)
 227                 num_timings = p->desc->num_timings;
 228
 229         if (timings)
 230                 for (i = 0; i < num_timings; i++)
 231                         timings[i] = p->desc->timings[i];
 232
 233         return p->desc->num_timings;
 234 }
 235
 236 static const struct drm_panel_funcs seiko_panel_funcs = {
 237         .disable = seiko_panel_disable,
 238         .unprepare = seiko_panel_unprepare,
 239         .prepare = seiko_panel_prepare,
 240         .enable = seiko_panel_enable,
 241         .get_modes = seiko_panel_get_modes,
 242         .get_timings = seiko_panel_get_timings,
 243 };
 244
 245 static int seiko_panel_probe(struct device *dev,
 246                                         const struct seiko_panel_desc *desc)
 247 {
 248         struct device_node *backlight;
 249         struct seiko_panel *panel;
 250         int err;
 251
 252         panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
 253         if (!panel)
 254                 return -ENOMEM;
 255
 256         panel->enabled = false;
 257         panel->prepared = false;
 258         panel->desc = desc;
 259
 260         panel->dvdd = devm_regulator_get(dev, "dvdd");
 261         if (IS_ERR(panel->dvdd))
 262                 return PTR_ERR(panel->dvdd);
 263
 264         panel->avdd = devm_regulator_get(dev, "avdd");
 265         if (IS_ERR(panel->avdd))
 266                 return PTR_ERR(panel->avdd);
 267
 268         backlight = of_parse_phandle(dev->of_node, "backlight", 0);
 269         if (backlight) {
 270                 panel->backlight = of_find_backlight_by_node(backlight);
 271                 of_node_put(backlight);
 272
 273                 if (!panel->backlight)
 274                         return -EPROBE_DEFER;
 275         }
 276
 277         drm_panel_init(&panel->base, dev, &seiko_panel_funcs,
 278                        DRM_MODE_CONNECTOR_DPI);
 279
 280         err = drm_panel_add(&panel->base);
 281         if (err < 0)
 282                 return err;
 283
 284         dev_set_drvdata(dev, panel);
 285
 286         return 0;
 287 }
 288
 289 static int seiko_panel_remove(struct platform_device *pdev)
 290 {
 291         struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
 292
 293         drm_panel_remove(&panel->base);
 294
 295         seiko_panel_disable(&panel->base);
 296
 297         if (panel->backlight)
 298                 put_device(&panel->backlight->dev);
 299
 300         return 0;
 301 }
 302
 303 static void seiko_panel_shutdown(struct platform_device *pdev)
 304 {
 305         struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
 306
 307         seiko_panel_disable(&panel->base);
 308 }
 309
 310 static const struct display_timing seiko_43wvf1g_timing = {
 311         .pixelclock = { 33500000, 33500000, 33500000 },
 312         .hactive = { 800, 800, 800 },
 313         .hfront_porch = {  164, 164, 164 },
 314         .hback_porch = { 89, 89, 89 },
 315         .hsync_len = { 10, 10, 10 },
 316         .vactive = { 480, 480, 480 },
 317         .vfront_porch = { 10, 10, 10 },
 318         .vback_porch = { 23, 23, 23 },
 319         .vsync_len = { 10, 10, 10 },
 320         .flags = DISPLAY_FLAGS_DE_LOW,
 321 };
 322
 323 static const struct seiko_panel_desc seiko_43wvf1g = {
 324         .timings = &seiko_43wvf1g_timing,
 325         .num_timings = 1,
 326         .bpc = 8,
 327         .size = {
 328                 .width = 93,
 329                 .height = 57,
 330         },
 331         .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 332         .bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
 333 };
 334
 335 static const struct of_device_id platform_of_match[] = {
 336         {
 337                 .compatible = "sii,43wvf1g",
 338                 .data = &seiko_43wvf1g,
 339         }, {
 340                 /* sentinel */
 341         }
 342 };
 343 MODULE_DEVICE_TABLE(of, platform_of_match);
 344
 345 static int seiko_panel_platform_probe(struct platform_device *pdev)
 346 {
 347         const struct of_device_id *id;
 348
 349         id = of_match_node(platform_of_match, pdev->dev.of_node);
 350         if (!id)
 351                 return -ENODEV;
 352
 353         return seiko_panel_probe(&pdev->dev, id->data);
 354 }
 355
 356 static struct platform_driver seiko_panel_platform_driver = {
 357         .driver = {
 358                 .name = "seiko_panel",
 359                 .of_match_table = platform_of_match,
 360         },
 361         .probe = seiko_panel_platform_probe,
 362         .remove = seiko_panel_remove,
 363         .shutdown = seiko_panel_shutdown,
 364 };
 365 module_platform_driver(seiko_panel_platform_driver);
 366
 367 MODULE_AUTHOR("Marco Franchi <marco.franchi@nxp.com>");
 368 MODULE_DESCRIPTION("Seiko 43WVF1G panel driver");
 369 MODULE_LICENSE("GPL v2");