kernel/drivers/video/fbdev/omap2/dss/display.c

   1 /*
   2  * linux/drivers/video/omap2/dss/display.c
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
   6  *
   7  * Some code and ideas taken from drivers/video/omap/ driver
   8  * by Imre Deak.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along with
  20  * this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #define DSS_SUBSYS_NAME "DISPLAY"
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/of.h>
  30
  31 #include <video/omapdss.h>
  32 #include "dss.h"
  33 #include "dss_features.h"
  34
  35 void omapdss_default_get_resolution(struct omap_dss_device *dssdev,
  36                         u16 *xres, u16 *yres)
  37 {
  38         *xres = dssdev->panel.timings.x_res;
  39         *yres = dssdev->panel.timings.y_res;
  40 }
  41 EXPORT_SYMBOL(omapdss_default_get_resolution);
  42
  43 int omapdss_default_get_recommended_bpp(struct omap_dss_device *dssdev)
  44 {
  45         switch (dssdev->type) {
  46         case OMAP_DISPLAY_TYPE_DPI:
  47                 if (dssdev->phy.dpi.data_lines == 24)
  48                         return 24;
  49                 else
  50                         return 16;
  51
  52         case OMAP_DISPLAY_TYPE_DBI:
  53                 if (dssdev->ctrl.pixel_size == 24)
  54                         return 24;
  55                 else
  56                         return 16;
  57         case OMAP_DISPLAY_TYPE_DSI:
  58                 if (dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt) > 16)
  59                         return 24;
  60                 else
  61                         return 16;
  62         case OMAP_DISPLAY_TYPE_VENC:
  63         case OMAP_DISPLAY_TYPE_SDI:
  64         case OMAP_DISPLAY_TYPE_HDMI:
  65         case OMAP_DISPLAY_TYPE_DVI:
  66                 return 24;
  67         default:
  68                 BUG();
  69                 return 0;
  70         }
  71 }
  72 EXPORT_SYMBOL(omapdss_default_get_recommended_bpp);
  73
  74 void omapdss_default_get_timings(struct omap_dss_device *dssdev,
  75                 struct omap_video_timings *timings)
  76 {
  77         *timings = dssdev->panel.timings;
  78 }
  79 EXPORT_SYMBOL(omapdss_default_get_timings);
  80
  81 int dss_suspend_all_devices(void)
  82 {
  83         struct omap_dss_device *dssdev = NULL;
  84
  85         for_each_dss_dev(dssdev) {
  86                 if (!dssdev->driver)
  87                         continue;
  88
  89                 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
  90                         dssdev->driver->disable(dssdev);
  91                         dssdev->activate_after_resume = true;
  92                 } else {
  93                         dssdev->activate_after_resume = false;
  94                 }
  95         }
  96
  97         return 0;
  98 }
  99
 100 int dss_resume_all_devices(void)
 101 {
 102         struct omap_dss_device *dssdev = NULL;
 103
 104         for_each_dss_dev(dssdev) {
 105                 if (!dssdev->driver)
 106                         continue;
 107
 108                 if (dssdev->activate_after_resume) {
 109                         dssdev->driver->enable(dssdev);
 110                         dssdev->activate_after_resume = false;
 111                 }
 112         }
 113
 114         return 0;
 115 }
 116
 117 void dss_disable_all_devices(void)
 118 {
 119         struct omap_dss_device *dssdev = NULL;
 120
 121         for_each_dss_dev(dssdev) {
 122                 if (!dssdev->driver)
 123                         continue;
 124
 125                 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 126                         dssdev->driver->disable(dssdev);
 127         }
 128 }
 129
 130 static LIST_HEAD(panel_list);
 131 static DEFINE_MUTEX(panel_list_mutex);
 132 static int disp_num_counter;
 133
 134 int omapdss_register_display(struct omap_dss_device *dssdev)
 135 {
 136         struct omap_dss_driver *drv = dssdev->driver;
 137         int id;
 138
 139         /*
 140          * Note: this presumes all the displays are either using DT or non-DT,
 141          * which normally should be the case. This also presumes that all
 142          * displays either have an DT alias, or none has.
 143          */
 144
 145         if (dssdev->dev->of_node) {
 146                 id = of_alias_get_id(dssdev->dev->of_node, "display");
 147
 148                 if (id < 0)
 149                         id = disp_num_counter++;
 150         } else {
 151                 id = disp_num_counter++;
 152         }
 153
 154         snprintf(dssdev->alias, sizeof(dssdev->alias), "display%d", id);
 155
 156         /* Use 'label' property for name, if it exists */
 157         if (dssdev->dev->of_node)
 158                 of_property_read_string(dssdev->dev->of_node, "label",
 159                         &dssdev->name);
 160
 161         if (dssdev->name == NULL)
 162                 dssdev->name = dssdev->alias;
 163
 164         if (drv && drv->get_resolution == NULL)
 165                 drv->get_resolution = omapdss_default_get_resolution;
 166         if (drv && drv->get_recommended_bpp == NULL)
 167                 drv->get_recommended_bpp = omapdss_default_get_recommended_bpp;
 168         if (drv && drv->get_timings == NULL)
 169                 drv->get_timings = omapdss_default_get_timings;
 170
 171         mutex_lock(&panel_list_mutex);
 172         list_add_tail(&dssdev->panel_list, &panel_list);
 173         mutex_unlock(&panel_list_mutex);
 174         return 0;
 175 }
 176 EXPORT_SYMBOL(omapdss_register_display);
 177
 178 void omapdss_unregister_display(struct omap_dss_device *dssdev)
 179 {
 180         mutex_lock(&panel_list_mutex);
 181         list_del(&dssdev->panel_list);
 182         mutex_unlock(&panel_list_mutex);
 183 }
 184 EXPORT_SYMBOL(omapdss_unregister_display);
 185
 186 struct omap_dss_device *omap_dss_get_device(struct omap_dss_device *dssdev)
 187 {
 188         if (!try_module_get(dssdev->owner))
 189                 return NULL;
 190
 191         if (get_device(dssdev->dev) == NULL) {
 192                 module_put(dssdev->owner);
 193                 return NULL;
 194         }
 195
 196         return dssdev;
 197 }
 198 EXPORT_SYMBOL(omap_dss_get_device);
 199
 200 void omap_dss_put_device(struct omap_dss_device *dssdev)
 201 {
 202         put_device(dssdev->dev);
 203         module_put(dssdev->owner);
 204 }
 205 EXPORT_SYMBOL(omap_dss_put_device);
 206
 207 /*
 208  * ref count of the found device is incremented.
 209  * ref count of from-device is decremented.
 210  */
 211 struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
 212 {
 213         struct list_head *l;
 214         struct omap_dss_device *dssdev;
 215
 216         mutex_lock(&panel_list_mutex);
 217
 218         if (list_empty(&panel_list)) {
 219                 dssdev = NULL;
 220                 goto out;
 221         }
 222
 223         if (from == NULL) {
 224                 dssdev = list_first_entry(&panel_list, struct omap_dss_device,
 225                                 panel_list);
 226                 omap_dss_get_device(dssdev);
 227                 goto out;
 228         }
 229
 230         omap_dss_put_device(from);
 231
 232         list_for_each(l, &panel_list) {
 233                 dssdev = list_entry(l, struct omap_dss_device, panel_list);
 234                 if (dssdev == from) {
 235                         if (list_is_last(l, &panel_list)) {
 236                                 dssdev = NULL;
 237                                 goto out;
 238                         }
 239
 240                         dssdev = list_entry(l->next, struct omap_dss_device,
 241                                         panel_list);
 242                         omap_dss_get_device(dssdev);
 243                         goto out;
 244                 }
 245         }
 246
 247         WARN(1, "'from' dssdev not found\n");
 248
 249         dssdev = NULL;
 250 out:
 251         mutex_unlock(&panel_list_mutex);
 252         return dssdev;
 253 }
 254 EXPORT_SYMBOL(omap_dss_get_next_device);
 255
 256 struct omap_dss_device *omap_dss_find_device(void *data,
 257                 int (*match)(struct omap_dss_device *dssdev, void *data))
 258 {
 259         struct omap_dss_device *dssdev = NULL;
 260
 261         while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
 262                 if (match(dssdev, data))
 263                         return dssdev;
 264         }
 265
 266         return NULL;
 267 }
 268 EXPORT_SYMBOL(omap_dss_find_device);
 269
 270 void videomode_to_omap_video_timings(const struct videomode *vm,
 271                 struct omap_video_timings *ovt)
 272 {
 273         memset(ovt, 0, sizeof(*ovt));
 274
 275         ovt->pixelclock = vm->pixelclock;
 276         ovt->x_res = vm->hactive;
 277         ovt->hbp = vm->hback_porch;
 278         ovt->hfp = vm->hfront_porch;
 279         ovt->hsw = vm->hsync_len;
 280         ovt->y_res = vm->vactive;
 281         ovt->vbp = vm->vback_porch;
 282         ovt->vfp = vm->vfront_porch;
 283         ovt->vsw = vm->vsync_len;
 284
 285         ovt->vsync_level = vm->flags & DISPLAY_FLAGS_VSYNC_HIGH ?
 286                 OMAPDSS_SIG_ACTIVE_HIGH :
 287                 OMAPDSS_SIG_ACTIVE_LOW;
 288         ovt->hsync_level = vm->flags & DISPLAY_FLAGS_HSYNC_HIGH ?
 289                 OMAPDSS_SIG_ACTIVE_HIGH :
 290                 OMAPDSS_SIG_ACTIVE_LOW;
 291         ovt->de_level = vm->flags & DISPLAY_FLAGS_DE_HIGH ?
 292                 OMAPDSS_SIG_ACTIVE_HIGH :
 293                 OMAPDSS_SIG_ACTIVE_LOW;
 294         ovt->data_pclk_edge = vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE ?
 295                 OMAPDSS_DRIVE_SIG_RISING_EDGE :
 296                 OMAPDSS_DRIVE_SIG_FALLING_EDGE;
 297
 298         ovt->sync_pclk_edge = ovt->data_pclk_edge;
 299 }
 300 EXPORT_SYMBOL(videomode_to_omap_video_timings);
 301
 302 void omap_video_timings_to_videomode(const struct omap_video_timings *ovt,
 303                 struct videomode *vm)
 304 {
 305         memset(vm, 0, sizeof(*vm));
 306
 307         vm->pixelclock = ovt->pixelclock;
 308
 309         vm->hactive = ovt->x_res;
 310         vm->hback_porch = ovt->hbp;
 311         vm->hfront_porch = ovt->hfp;
 312         vm->hsync_len = ovt->hsw;
 313         vm->vactive = ovt->y_res;
 314         vm->vback_porch = ovt->vbp;
 315         vm->vfront_porch = ovt->vfp;
 316         vm->vsync_len = ovt->vsw;
 317
 318         if (ovt->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 319                 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
 320         else
 321                 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
 322
 323         if (ovt->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 324                 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
 325         else
 326                 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
 327
 328         if (ovt->de_level == OMAPDSS_SIG_ACTIVE_HIGH)
 329                 vm->flags |= DISPLAY_FLAGS_DE_HIGH;
 330         else
 331                 vm->flags |= DISPLAY_FLAGS_DE_LOW;
 332
 333         if (ovt->data_pclk_edge == OMAPDSS_DRIVE_SIG_RISING_EDGE)
 334                 vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
 335         else
 336                 vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
 337 }
 338 EXPORT_SYMBOL(omap_video_timings_to_videomode);