drivers/video/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
  30 #include <video/omapdss.h>
  31 #include "dss.h"
  32 #include "dss_features.h"
  33
  34 void omapdss_default_get_resolution(struct omap_dss_device *dssdev,
  35                         u16 *xres, u16 *yres)
  36 {
  37         *xres = dssdev->panel.timings.x_res;
  38         *yres = dssdev->panel.timings.y_res;
  39 }
  40 EXPORT_SYMBOL(omapdss_default_get_resolution);
  41
  42 int omapdss_default_get_recommended_bpp(struct omap_dss_device *dssdev)
  43 {
  44         switch (dssdev->type) {
  45         case OMAP_DISPLAY_TYPE_DPI:
  46                 if (dssdev->phy.dpi.data_lines == 24)
  47                         return 24;
  48                 else
  49                         return 16;
  50
  51         case OMAP_DISPLAY_TYPE_DBI:
  52                 if (dssdev->ctrl.pixel_size == 24)
  53                         return 24;
  54                 else
  55                         return 16;
  56         case OMAP_DISPLAY_TYPE_DSI:
  57                 if (dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt) > 16)
  58                         return 24;
  59                 else
  60                         return 16;
  61         case OMAP_DISPLAY_TYPE_VENC:
  62         case OMAP_DISPLAY_TYPE_SDI:
  63         case OMAP_DISPLAY_TYPE_HDMI:
  64         case OMAP_DISPLAY_TYPE_DVI:
  65                 return 24;
  66         default:
  67                 BUG();
  68                 return 0;
  69         }
  70 }
  71 EXPORT_SYMBOL(omapdss_default_get_recommended_bpp);
  72
  73 void omapdss_default_get_timings(struct omap_dss_device *dssdev,
  74                 struct omap_video_timings *timings)
  75 {
  76         *timings = dssdev->panel.timings;
  77 }
  78 EXPORT_SYMBOL(omapdss_default_get_timings);
  79
  80 int dss_suspend_all_devices(void)
  81 {
  82         struct omap_dss_device *dssdev = NULL;
  83
  84         for_each_dss_dev(dssdev) {
  85                 if (!dssdev->driver)
  86                         continue;
  87
  88                 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
  89                         dssdev->driver->disable(dssdev);
  90                         dssdev->activate_after_resume = true;
  91                 } else {
  92                         dssdev->activate_after_resume = false;
  93                 }
  94         }
  95
  96         return 0;
  97 }
  98
  99 int dss_resume_all_devices(void)
 100 {
 101         struct omap_dss_device *dssdev = NULL;
 102
 103         for_each_dss_dev(dssdev) {
 104                 if (!dssdev->driver)
 105                         continue;
 106
 107                 if (dssdev->activate_after_resume) {
 108                         dssdev->driver->enable(dssdev);
 109                         dssdev->activate_after_resume = false;
 110                 }
 111         }
 112
 113         return 0;
 114 }
 115
 116 void dss_disable_all_devices(void)
 117 {
 118         struct omap_dss_device *dssdev = NULL;
 119
 120         for_each_dss_dev(dssdev) {
 121                 if (!dssdev->driver)
 122                         continue;
 123
 124                 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 125                         dssdev->driver->disable(dssdev);
 126         }
 127 }
 128
 129 static LIST_HEAD(panel_list);
 130 static DEFINE_MUTEX(panel_list_mutex);
 131 static int disp_num_counter;
 132
 133 int omapdss_register_display(struct omap_dss_device *dssdev)
 134 {
 135         struct omap_dss_driver *drv = dssdev->driver;
 136
 137         snprintf(dssdev->alias, sizeof(dssdev->alias),
 138                         "display%d", disp_num_counter++);
 139
 140         if (drv && drv->get_resolution == NULL)
 141                 drv->get_resolution = omapdss_default_get_resolution;
 142         if (drv && drv->get_recommended_bpp == NULL)
 143                 drv->get_recommended_bpp = omapdss_default_get_recommended_bpp;
 144         if (drv && drv->get_timings == NULL)
 145                 drv->get_timings = omapdss_default_get_timings;
 146
 147         mutex_lock(&panel_list_mutex);
 148         list_add_tail(&dssdev->panel_list, &panel_list);
 149         mutex_unlock(&panel_list_mutex);
 150         return 0;
 151 }
 152 EXPORT_SYMBOL(omapdss_register_display);
 153
 154 void omapdss_unregister_display(struct omap_dss_device *dssdev)
 155 {
 156         mutex_lock(&panel_list_mutex);
 157         list_del(&dssdev->panel_list);
 158         mutex_unlock(&panel_list_mutex);
 159 }
 160 EXPORT_SYMBOL(omapdss_unregister_display);
 161
 162 struct omap_dss_device *omap_dss_get_device(struct omap_dss_device *dssdev)
 163 {
 164         if (!try_module_get(dssdev->owner))
 165                 return NULL;
 166
 167         if (get_device(dssdev->dev) == NULL) {
 168                 module_put(dssdev->owner);
 169                 return NULL;
 170         }
 171
 172         return dssdev;
 173 }
 174 EXPORT_SYMBOL(omap_dss_get_device);
 175
 176 void omap_dss_put_device(struct omap_dss_device *dssdev)
 177 {
 178         put_device(dssdev->dev);
 179         module_put(dssdev->owner);
 180 }
 181 EXPORT_SYMBOL(omap_dss_put_device);
 182
 183 /*
 184  * ref count of the found device is incremented.
 185  * ref count of from-device is decremented.
 186  */
 187 struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
 188 {
 189         struct list_head *l;
 190         struct omap_dss_device *dssdev;
 191
 192         mutex_lock(&panel_list_mutex);
 193
 194         if (list_empty(&panel_list)) {
 195                 dssdev = NULL;
 196                 goto out;
 197         }
 198
 199         if (from == NULL) {
 200                 dssdev = list_first_entry(&panel_list, struct omap_dss_device,
 201                                 panel_list);
 202                 omap_dss_get_device(dssdev);
 203                 goto out;
 204         }
 205
 206         omap_dss_put_device(from);
 207
 208         list_for_each(l, &panel_list) {
 209                 dssdev = list_entry(l, struct omap_dss_device, panel_list);
 210                 if (dssdev == from) {
 211                         if (list_is_last(l, &panel_list)) {
 212                                 dssdev = NULL;
 213                                 goto out;
 214                         }
 215
 216                         dssdev = list_entry(l->next, struct omap_dss_device,
 217                                         panel_list);
 218                         omap_dss_get_device(dssdev);
 219                         goto out;
 220                 }
 221         }
 222
 223         WARN(1, "'from' dssdev not found\n");
 224
 225         dssdev = NULL;
 226 out:
 227         mutex_unlock(&panel_list_mutex);
 228         return dssdev;
 229 }
 230 EXPORT_SYMBOL(omap_dss_get_next_device);
 231
 232 struct omap_dss_device *omap_dss_find_device(void *data,
 233                 int (*match)(struct omap_dss_device *dssdev, void *data))
 234 {
 235         struct omap_dss_device *dssdev = NULL;
 236
 237         while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
 238                 if (match(dssdev, data))
 239                         return dssdev;
 240         }
 241
 242         return NULL;
 243 }
 244 EXPORT_SYMBOL(omap_dss_find_device);
 245
 246 void videomode_to_omap_video_timings(const struct videomode *vm,
 247                 struct omap_video_timings *ovt)
 248 {
 249         memset(ovt, 0, sizeof(*ovt));
 250
 251         ovt->pixel_clock = vm->pixelclock / 1000;
 252         ovt->x_res = vm->hactive;
 253         ovt->hbp = vm->hback_porch;
 254         ovt->hfp = vm->hfront_porch;
 255         ovt->hsw = vm->hsync_len;
 256         ovt->y_res = vm->vactive;
 257         ovt->vbp = vm->vback_porch;
 258         ovt->vfp = vm->vfront_porch;
 259         ovt->vsw = vm->vsync_len;
 260
 261         ovt->vsync_level = vm->flags & DISPLAY_FLAGS_VSYNC_HIGH ?
 262                 OMAPDSS_SIG_ACTIVE_HIGH :
 263                 OMAPDSS_SIG_ACTIVE_LOW;
 264         ovt->hsync_level = vm->flags & DISPLAY_FLAGS_HSYNC_HIGH ?
 265                 OMAPDSS_SIG_ACTIVE_HIGH :
 266                 OMAPDSS_SIG_ACTIVE_LOW;
 267         ovt->de_level = vm->flags & DISPLAY_FLAGS_DE_HIGH ?
 268                 OMAPDSS_SIG_ACTIVE_HIGH :
 269                 OMAPDSS_SIG_ACTIVE_LOW;
 270         ovt->data_pclk_edge = vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE ?
 271                 OMAPDSS_DRIVE_SIG_RISING_EDGE :
 272                 OMAPDSS_DRIVE_SIG_FALLING_EDGE;
 273
 274         ovt->sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES;
 275 }
 276 EXPORT_SYMBOL(videomode_to_omap_video_timings);
 277
 278 void omap_video_timings_to_videomode(const struct omap_video_timings *ovt,
 279                 struct videomode *vm)
 280 {
 281         memset(vm, 0, sizeof(*vm));
 282
 283         vm->pixelclock = ovt->pixel_clock * 1000;
 284
 285         vm->hactive = ovt->x_res;
 286         vm->hback_porch = ovt->hbp;
 287         vm->hfront_porch = ovt->hfp;
 288         vm->hsync_len = ovt->hsw;
 289         vm->vactive = ovt->y_res;
 290         vm->vback_porch = ovt->vbp;
 291         vm->vfront_porch = ovt->vfp;
 292         vm->vsync_len = ovt->vsw;
 293
 294         if (ovt->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 295                 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
 296         else
 297                 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
 298
 299         if (ovt->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 300                 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
 301         else
 302                 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
 303
 304         if (ovt->de_level == OMAPDSS_SIG_ACTIVE_HIGH)
 305                 vm->flags |= DISPLAY_FLAGS_DE_HIGH;
 306         else
 307                 vm->flags |= DISPLAY_FLAGS_DE_LOW;
 308
 309         if (ovt->data_pclk_edge == OMAPDSS_DRIVE_SIG_RISING_EDGE)
 310                 vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
 311         else
 312                 vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
 313 }
 314 EXPORT_SYMBOL(omap_video_timings_to_videomode);