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

   1 /*
   2  * Copyright (C) 2015 Red Hat
   3  * Copyright (C) 2015 Sony Mobile Communications Inc.
   4  * Author: Werner Johansson <werner.johansson@sonymobile.com>
   5  *
   6  * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published by
  10  * the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/backlight.h>
  22 #include <linux/module.h>
  23 #include <linux/of.h>
  24 #include <linux/regulator/consumer.h>
  25
  26 #include <drm/drmP.h>
  27 #include <drm/drm_crtc.h>
  28 #include <drm/drm_mipi_dsi.h>
  29 #include <drm/drm_panel.h>
  30
  31 #include <video/mipi_display.h>
  32
  33 /*
  34  * When power is turned off to this panel a minimum off time of 500ms has to be
  35  * observed before powering back on as there's no external reset pin. Keep
  36  * track of earliest wakeup time and delay subsequent prepare call accordingly
  37  */
  38 #define MIN_POFF_MS (500)
  39
  40 struct wuxga_nt_panel {
  41         struct drm_panel base;
  42         struct mipi_dsi_device *dsi;
  43
  44         struct backlight_device *backlight;
  45         struct regulator *supply;
  46
  47         bool prepared;
  48         bool enabled;
  49
  50         ktime_t earliest_wake;
  51
  52         const struct drm_display_mode *mode;
  53 };
  54
  55 static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
  56 {
  57         return container_of(panel, struct wuxga_nt_panel, base);
  58 }
  59
  60 static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
  61 {
  62         struct mipi_dsi_device *dsi = wuxga_nt->dsi;
  63         int ret;
  64
  65         ret = mipi_dsi_turn_on_peripheral(dsi);
  66         if (ret < 0)
  67                 return ret;
  68
  69         return 0;
  70 }
  71
  72 static int wuxga_nt_panel_disable(struct drm_panel *panel)
  73 {
  74         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
  75
  76         if (!wuxga_nt->enabled)
  77                 return 0;
  78
  79         mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
  80
  81         if (wuxga_nt->backlight) {
  82                 wuxga_nt->backlight->props.power = FB_BLANK_POWERDOWN;
  83                 wuxga_nt->backlight->props.state |= BL_CORE_FBBLANK;
  84                 backlight_update_status(wuxga_nt->backlight);
  85         }
  86
  87         wuxga_nt->enabled = false;
  88
  89         return 0;
  90 }
  91
  92 static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
  93 {
  94         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
  95
  96         if (!wuxga_nt->prepared)
  97                 return 0;
  98
  99         regulator_disable(wuxga_nt->supply);
 100         wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
 101         wuxga_nt->prepared = false;
 102
 103         return 0;
 104 }
 105
 106 static int wuxga_nt_panel_prepare(struct drm_panel *panel)
 107 {
 108         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
 109         int ret;
 110         s64 enablewait;
 111
 112         if (wuxga_nt->prepared)
 113                 return 0;
 114
 115         /*
 116          * If the user re-enabled the panel before the required off-time then
 117          * we need to wait the remaining period before re-enabling regulator
 118          */
 119         enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
 120
 121         /* Sanity check, this should never happen */
 122         if (enablewait > MIN_POFF_MS)
 123                 enablewait = MIN_POFF_MS;
 124
 125         if (enablewait > 0)
 126                 msleep(enablewait);
 127
 128         ret = regulator_enable(wuxga_nt->supply);
 129         if (ret < 0)
 130                 return ret;
 131
 132         /*
 133          * A minimum delay of 250ms is required after power-up until commands
 134          * can be sent
 135          */
 136         msleep(250);
 137
 138         ret = wuxga_nt_panel_on(wuxga_nt);
 139         if (ret < 0) {
 140                 dev_err(panel->dev, "failed to set panel on: %d\n", ret);
 141                 goto poweroff;
 142         }
 143
 144         wuxga_nt->prepared = true;
 145
 146         return 0;
 147
 148 poweroff:
 149         regulator_disable(wuxga_nt->supply);
 150
 151         return ret;
 152 }
 153
 154 static int wuxga_nt_panel_enable(struct drm_panel *panel)
 155 {
 156         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
 157
 158         if (wuxga_nt->enabled)
 159                 return 0;
 160
 161         if (wuxga_nt->backlight) {
 162                 wuxga_nt->backlight->props.power = FB_BLANK_UNBLANK;
 163                 wuxga_nt->backlight->props.state &= ~BL_CORE_FBBLANK;
 164                 backlight_update_status(wuxga_nt->backlight);
 165         }
 166
 167         wuxga_nt->enabled = true;
 168
 169         return 0;
 170 }
 171
 172 static const struct drm_display_mode default_mode = {
 173         .clock = 164402,
 174         .hdisplay = 1920,
 175         .hsync_start = 1920 + 152,
 176         .hsync_end = 1920 + 152 + 52,
 177         .htotal = 1920 + 152 + 52 + 20,
 178         .vdisplay = 1200,
 179         .vsync_start = 1200 + 24,
 180         .vsync_end = 1200 + 24 + 6,
 181         .vtotal = 1200 + 24 + 6 + 48,
 182         .vrefresh = 60,
 183 };
 184
 185 static int wuxga_nt_panel_get_modes(struct drm_panel *panel)
 186 {
 187         struct drm_display_mode *mode;
 188
 189         mode = drm_mode_duplicate(panel->drm, &default_mode);
 190         if (!mode) {
 191                 dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
 192                                 default_mode.hdisplay, default_mode.vdisplay,
 193                                 default_mode.vrefresh);
 194                 return -ENOMEM;
 195         }
 196
 197         drm_mode_set_name(mode);
 198
 199         drm_mode_probed_add(panel->connector, mode);
 200
 201         panel->connector->display_info.width_mm = 217;
 202         panel->connector->display_info.height_mm = 136;
 203
 204         return 1;
 205 }
 206
 207 static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
 208         .disable = wuxga_nt_panel_disable,
 209         .unprepare = wuxga_nt_panel_unprepare,
 210         .prepare = wuxga_nt_panel_prepare,
 211         .enable = wuxga_nt_panel_enable,
 212         .get_modes = wuxga_nt_panel_get_modes,
 213 };
 214
 215 static const struct of_device_id wuxga_nt_of_match[] = {
 216         { .compatible = "panasonic,vvx10f034n00", },
 217         { }
 218 };
 219 MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
 220
 221 static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
 222 {
 223         struct device *dev = &wuxga_nt->dsi->dev;
 224         struct device_node *np;
 225         int ret;
 226
 227         wuxga_nt->mode = &default_mode;
 228
 229         wuxga_nt->supply = devm_regulator_get(dev, "power");
 230         if (IS_ERR(wuxga_nt->supply))
 231                 return PTR_ERR(wuxga_nt->supply);
 232
 233         np = of_parse_phandle(dev->of_node, "backlight", 0);
 234         if (np) {
 235                 wuxga_nt->backlight = of_find_backlight_by_node(np);
 236                 of_node_put(np);
 237
 238                 if (!wuxga_nt->backlight)
 239                         return -EPROBE_DEFER;
 240         }
 241
 242         drm_panel_init(&wuxga_nt->base);
 243         wuxga_nt->base.funcs = &wuxga_nt_panel_funcs;
 244         wuxga_nt->base.dev = &wuxga_nt->dsi->dev;
 245
 246         ret = drm_panel_add(&wuxga_nt->base);
 247         if (ret < 0)
 248                 goto put_backlight;
 249
 250         return 0;
 251
 252 put_backlight:
 253         if (wuxga_nt->backlight)
 254                 put_device(&wuxga_nt->backlight->dev);
 255
 256         return ret;
 257 }
 258
 259 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
 260 {
 261         if (wuxga_nt->base.dev)
 262                 drm_panel_remove(&wuxga_nt->base);
 263
 264         if (wuxga_nt->backlight)
 265                 put_device(&wuxga_nt->backlight->dev);
 266 }
 267
 268 static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
 269 {
 270         struct wuxga_nt_panel *wuxga_nt;
 271         int ret;
 272
 273         dsi->lanes = 4;
 274         dsi->format = MIPI_DSI_FMT_RGB888;
 275         dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
 276                         MIPI_DSI_MODE_VIDEO_HSE |
 277                         MIPI_DSI_CLOCK_NON_CONTINUOUS |
 278                         MIPI_DSI_MODE_LPM;
 279
 280         wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
 281         if (!wuxga_nt)
 282                 return -ENOMEM;
 283
 284         mipi_dsi_set_drvdata(dsi, wuxga_nt);
 285
 286         wuxga_nt->dsi = dsi;
 287
 288         ret = wuxga_nt_panel_add(wuxga_nt);
 289         if (ret < 0)
 290                 return ret;
 291
 292         return mipi_dsi_attach(dsi);
 293 }
 294
 295 static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
 296 {
 297         struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
 298         int ret;
 299
 300         ret = wuxga_nt_panel_disable(&wuxga_nt->base);
 301         if (ret < 0)
 302                 dev_err(&dsi->dev, "failed to disable panel: %d\n", 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_detach(&wuxga_nt->base);
 309         wuxga_nt_panel_del(wuxga_nt);
 310
 311         return 0;
 312 }
 313
 314 static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
 315 {
 316         struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
 317
 318         wuxga_nt_panel_disable(&wuxga_nt->base);
 319 }
 320
 321 static struct mipi_dsi_driver wuxga_nt_panel_driver = {
 322         .driver = {
 323                 .name = "panel-panasonic-vvx10f034n00",
 324                 .of_match_table = wuxga_nt_of_match,
 325         },
 326         .probe = wuxga_nt_panel_probe,
 327         .remove = wuxga_nt_panel_remove,
 328         .shutdown = wuxga_nt_panel_shutdown,
 329 };
 330 module_mipi_dsi_driver(wuxga_nt_panel_driver);
 331
 332 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
 333 MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
 334 MODULE_LICENSE("GPL v2");