drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 Red Hat
   4  * Copyright (C) 2015 Sony Mobile Communications Inc.
   5  * Author: Werner Johansson <werner.johansson@sonymobile.com>
   6  *
   7  * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
   8  */
   9
  10 #include <linux/delay.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/regulator/consumer.h>
  14
  15 #include <video/mipi_display.h>
  16
  17 #include <drm/drm_crtc.h>
  18 #include <drm/drm_device.h>
  19 #include <drm/drm_mipi_dsi.h>
  20 #include <drm/drm_panel.h>
  21
  22 /*
  23  * When power is turned off to this panel a minimum off time of 500ms has to be
  24  * observed before powering back on as there's no external reset pin. Keep
  25  * track of earliest wakeup time and delay subsequent prepare call accordingly
  26  */
  27 #define MIN_POFF_MS (500)
  28
  29 struct wuxga_nt_panel {
  30         struct drm_panel base;
  31         struct mipi_dsi_device *dsi;
  32
  33         struct regulator *supply;
  34
  35         bool prepared;
  36         bool enabled;
  37
  38         ktime_t earliest_wake;
  39
  40         const struct drm_display_mode *mode;
  41 };
  42
  43 static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
  44 {
  45         return container_of(panel, struct wuxga_nt_panel, base);
  46 }
  47
  48 static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
  49 {
  50         return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
  51 }
  52
  53 static int wuxga_nt_panel_disable(struct drm_panel *panel)
  54 {
  55         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
  56         int mipi_ret, bl_ret = 0;
  57
  58         if (!wuxga_nt->enabled)
  59                 return 0;
  60
  61         mipi_ret = mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
  62
  63         wuxga_nt->enabled = false;
  64
  65         return mipi_ret ? mipi_ret : bl_ret;
  66 }
  67
  68 static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
  69 {
  70         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
  71
  72         if (!wuxga_nt->prepared)
  73                 return 0;
  74
  75         regulator_disable(wuxga_nt->supply);
  76         wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
  77         wuxga_nt->prepared = false;
  78
  79         return 0;
  80 }
  81
  82 static int wuxga_nt_panel_prepare(struct drm_panel *panel)
  83 {
  84         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
  85         int ret;
  86         s64 enablewait;
  87
  88         if (wuxga_nt->prepared)
  89                 return 0;
  90
  91         /*
  92          * If the user re-enabled the panel before the required off-time then
  93          * we need to wait the remaining period before re-enabling regulator
  94          */
  95         enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
  96
  97         /* Sanity check, this should never happen */
  98         if (enablewait > MIN_POFF_MS)
  99                 enablewait = MIN_POFF_MS;
 100
 101         if (enablewait > 0)
 102                 msleep(enablewait);
 103
 104         ret = regulator_enable(wuxga_nt->supply);
 105         if (ret < 0)
 106                 return ret;
 107
 108         /*
 109          * A minimum delay of 250ms is required after power-up until commands
 110          * can be sent
 111          */
 112         msleep(250);
 113
 114         ret = wuxga_nt_panel_on(wuxga_nt);
 115         if (ret < 0) {
 116                 dev_err(panel->dev, "failed to set panel on: %d\n", ret);
 117                 goto poweroff;
 118         }
 119
 120         wuxga_nt->prepared = true;
 121
 122         return 0;
 123
 124 poweroff:
 125         regulator_disable(wuxga_nt->supply);
 126
 127         return ret;
 128 }
 129
 130 static int wuxga_nt_panel_enable(struct drm_panel *panel)
 131 {
 132         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
 133
 134         if (wuxga_nt->enabled)
 135                 return 0;
 136
 137         wuxga_nt->enabled = true;
 138
 139         return 0;
 140 }
 141
 142 static const struct drm_display_mode default_mode = {
 143         .clock = 164402,
 144         .hdisplay = 1920,
 145         .hsync_start = 1920 + 152,
 146         .hsync_end = 1920 + 152 + 52,
 147         .htotal = 1920 + 152 + 52 + 20,
 148         .vdisplay = 1200,
 149         .vsync_start = 1200 + 24,
 150         .vsync_end = 1200 + 24 + 6,
 151         .vtotal = 1200 + 24 + 6 + 48,
 152 };
 153
 154 static int wuxga_nt_panel_get_modes(struct drm_panel *panel,
 155                                     struct drm_connector *connector)
 156 {
 157         struct drm_display_mode *mode;
 158
 159         mode = drm_mode_duplicate(connector->dev, &default_mode);
 160         if (!mode) {
 161                 dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
 162                         default_mode.hdisplay, default_mode.vdisplay,
 163                         drm_mode_vrefresh(&default_mode));
 164                 return -ENOMEM;
 165         }
 166
 167         drm_mode_set_name(mode);
 168
 169         drm_mode_probed_add(connector, mode);
 170
 171         connector->display_info.width_mm = 217;
 172         connector->display_info.height_mm = 136;
 173
 174         return 1;
 175 }
 176
 177 static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
 178         .disable = wuxga_nt_panel_disable,
 179         .unprepare = wuxga_nt_panel_unprepare,
 180         .prepare = wuxga_nt_panel_prepare,
 181         .enable = wuxga_nt_panel_enable,
 182         .get_modes = wuxga_nt_panel_get_modes,
 183 };
 184
 185 static const struct of_device_id wuxga_nt_of_match[] = {
 186         { .compatible = "panasonic,vvx10f034n00", },
 187         { }
 188 };
 189 MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
 190
 191 static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
 192 {
 193         struct device *dev = &wuxga_nt->dsi->dev;
 194         int ret;
 195
 196         wuxga_nt->mode = &default_mode;
 197
 198         wuxga_nt->supply = devm_regulator_get(dev, "power");
 199         if (IS_ERR(wuxga_nt->supply))
 200                 return PTR_ERR(wuxga_nt->supply);
 201
 202         drm_panel_init(&wuxga_nt->base, &wuxga_nt->dsi->dev,
 203                        &wuxga_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);
 204
 205         ret = drm_panel_of_backlight(&wuxga_nt->base);
 206         if (ret)
 207                 return ret;
 208
 209         drm_panel_add(&wuxga_nt->base);
 210
 211         return 0;
 212 }
 213
 214 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
 215 {
 216         if (wuxga_nt->base.dev)
 217                 drm_panel_remove(&wuxga_nt->base);
 218 }
 219
 220 static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
 221 {
 222         struct wuxga_nt_panel *wuxga_nt;
 223         int ret;
 224
 225         dsi->lanes = 4;
 226         dsi->format = MIPI_DSI_FMT_RGB888;
 227         dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
 228                         MIPI_DSI_MODE_VIDEO_HSE |
 229                         MIPI_DSI_CLOCK_NON_CONTINUOUS |
 230                         MIPI_DSI_MODE_LPM;
 231
 232         wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
 233         if (!wuxga_nt)
 234                 return -ENOMEM;
 235
 236         mipi_dsi_set_drvdata(dsi, wuxga_nt);
 237
 238         wuxga_nt->dsi = dsi;
 239
 240         ret = wuxga_nt_panel_add(wuxga_nt);
 241         if (ret < 0)
 242                 return ret;
 243
 244         return mipi_dsi_attach(dsi);
 245 }
 246
 247 static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
 248 {
 249         struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
 250         int ret;
 251
 252         ret = drm_panel_disable(&wuxga_nt->base);
 253         if (ret < 0)
 254                 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
 255
 256         ret = mipi_dsi_detach(dsi);
 257         if (ret < 0)
 258                 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
 259
 260         wuxga_nt_panel_del(wuxga_nt);
 261
 262         return 0;
 263 }
 264
 265 static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
 266 {
 267         struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
 268
 269         drm_panel_disable(&wuxga_nt->base);
 270 }
 271
 272 static struct mipi_dsi_driver wuxga_nt_panel_driver = {
 273         .driver = {
 274                 .name = "panel-panasonic-vvx10f034n00",
 275                 .of_match_table = wuxga_nt_of_match,
 276         },
 277         .probe = wuxga_nt_panel_probe,
 278         .remove = wuxga_nt_panel_remove,
 279         .shutdown = wuxga_nt_panel_shutdown,
 280 };
 281 module_mipi_dsi_driver(wuxga_nt_panel_driver);
 282
 283 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
 284 MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
 285 MODULE_LICENSE("GPL v2");