drivers/gpu/drm/omapdrm/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 static LIST_HEAD(panel_list);
  82 static DEFINE_MUTEX(panel_list_mutex);
  83 static int disp_num_counter;
  84
  85 int omapdss_register_display(struct omap_dss_device *dssdev)
  86 {
  87         struct omap_dss_driver *drv = dssdev->driver;
  88         int id;
  89
  90         /*
  91          * Note: this presumes all the displays are either using DT or non-DT,
  92          * which normally should be the case. This also presumes that all
  93          * displays either have an DT alias, or none has.
  94          */
  95
  96         if (dssdev->dev->of_node) {
  97                 id = of_alias_get_id(dssdev->dev->of_node, "display");
  98
  99                 if (id < 0)
 100                         id = disp_num_counter++;
 101         } else {
 102                 id = disp_num_counter++;
 103         }
 104
 105         snprintf(dssdev->alias, sizeof(dssdev->alias), "display%d", id);
 106
 107         /* Use 'label' property for name, if it exists */
 108         if (dssdev->dev->of_node)
 109                 of_property_read_string(dssdev->dev->of_node, "label",
 110                         &dssdev->name);
 111
 112         if (dssdev->name == NULL)
 113                 dssdev->name = dssdev->alias;
 114
 115         if (drv && drv->get_resolution == NULL)
 116                 drv->get_resolution = omapdss_default_get_resolution;
 117         if (drv && drv->get_recommended_bpp == NULL)
 118                 drv->get_recommended_bpp = omapdss_default_get_recommended_bpp;
 119         if (drv && drv->get_timings == NULL)
 120                 drv->get_timings = omapdss_default_get_timings;
 121
 122         mutex_lock(&panel_list_mutex);
 123         list_add_tail(&dssdev->panel_list, &panel_list);
 124         mutex_unlock(&panel_list_mutex);
 125         return 0;
 126 }
 127 EXPORT_SYMBOL(omapdss_register_display);
 128
 129 void omapdss_unregister_display(struct omap_dss_device *dssdev)
 130 {
 131         mutex_lock(&panel_list_mutex);
 132         list_del(&dssdev->panel_list);
 133         mutex_unlock(&panel_list_mutex);
 134 }
 135 EXPORT_SYMBOL(omapdss_unregister_display);
 136
 137 struct omap_dss_device *omap_dss_get_device(struct omap_dss_device *dssdev)
 138 {
 139         if (!try_module_get(dssdev->owner))
 140                 return NULL;
 141
 142         if (get_device(dssdev->dev) == NULL) {
 143                 module_put(dssdev->owner);
 144                 return NULL;
 145         }
 146
 147         return dssdev;
 148 }
 149 EXPORT_SYMBOL(omap_dss_get_device);
 150
 151 void omap_dss_put_device(struct omap_dss_device *dssdev)
 152 {
 153         put_device(dssdev->dev);
 154         module_put(dssdev->owner);
 155 }
 156 EXPORT_SYMBOL(omap_dss_put_device);
 157
 158 /*
 159  * ref count of the found device is incremented.
 160  * ref count of from-device is decremented.
 161  */
 162 struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
 163 {
 164         struct list_head *l;
 165         struct omap_dss_device *dssdev;
 166
 167         mutex_lock(&panel_list_mutex);
 168
 169         if (list_empty(&panel_list)) {
 170                 dssdev = NULL;
 171                 goto out;
 172         }
 173
 174         if (from == NULL) {
 175                 dssdev = list_first_entry(&panel_list, struct omap_dss_device,
 176                                 panel_list);
 177                 omap_dss_get_device(dssdev);
 178                 goto out;
 179         }
 180
 181         omap_dss_put_device(from);
 182
 183         list_for_each(l, &panel_list) {
 184                 dssdev = list_entry(l, struct omap_dss_device, panel_list);
 185                 if (dssdev == from) {
 186                         if (list_is_last(l, &panel_list)) {
 187                                 dssdev = NULL;
 188                                 goto out;
 189                         }
 190
 191                         dssdev = list_entry(l->next, struct omap_dss_device,
 192                                         panel_list);
 193                         omap_dss_get_device(dssdev);
 194                         goto out;
 195                 }
 196         }
 197
 198         WARN(1, "'from' dssdev not found\n");
 199
 200         dssdev = NULL;
 201 out:
 202         mutex_unlock(&panel_list_mutex);
 203         return dssdev;
 204 }
 205 EXPORT_SYMBOL(omap_dss_get_next_device);
 206
 207 struct omap_dss_device *omap_dss_find_device(void *data,
 208                 int (*match)(struct omap_dss_device *dssdev, void *data))
 209 {
 210         struct omap_dss_device *dssdev = NULL;
 211
 212         while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
 213                 if (match(dssdev, data))
 214                         return dssdev;
 215         }
 216
 217         return NULL;
 218 }
 219 EXPORT_SYMBOL(omap_dss_find_device);
 220
 221 void videomode_to_omap_video_timings(const struct videomode *vm,
 222                 struct omap_video_timings *ovt)
 223 {
 224         memset(ovt, 0, sizeof(*ovt));
 225
 226         ovt->pixelclock = vm->pixelclock;
 227         ovt->x_res = vm->hactive;
 228         ovt->hbp = vm->hback_porch;
 229         ovt->hfp = vm->hfront_porch;
 230         ovt->hsw = vm->hsync_len;
 231         ovt->y_res = vm->vactive;
 232         ovt->vbp = vm->vback_porch;
 233         ovt->vfp = vm->vfront_porch;
 234         ovt->vsw = vm->vsync_len;
 235
 236         ovt->vsync_level = vm->flags & DISPLAY_FLAGS_VSYNC_HIGH ?
 237                 OMAPDSS_SIG_ACTIVE_HIGH :
 238                 OMAPDSS_SIG_ACTIVE_LOW;
 239         ovt->hsync_level = vm->flags & DISPLAY_FLAGS_HSYNC_HIGH ?
 240                 OMAPDSS_SIG_ACTIVE_HIGH :
 241                 OMAPDSS_SIG_ACTIVE_LOW;
 242         ovt->de_level = vm->flags & DISPLAY_FLAGS_DE_HIGH ?
 243                 OMAPDSS_SIG_ACTIVE_HIGH :
 244                 OMAPDSS_SIG_ACTIVE_LOW;
 245         ovt->data_pclk_edge = vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE ?
 246                 OMAPDSS_DRIVE_SIG_RISING_EDGE :
 247                 OMAPDSS_DRIVE_SIG_FALLING_EDGE;
 248
 249         ovt->sync_pclk_edge = ovt->data_pclk_edge;
 250 }
 251 EXPORT_SYMBOL(videomode_to_omap_video_timings);
 252
 253 void omap_video_timings_to_videomode(const struct omap_video_timings *ovt,
 254                 struct videomode *vm)
 255 {
 256         memset(vm, 0, sizeof(*vm));
 257
 258         vm->pixelclock = ovt->pixelclock;
 259
 260         vm->hactive = ovt->x_res;
 261         vm->hback_porch = ovt->hbp;
 262         vm->hfront_porch = ovt->hfp;
 263         vm->hsync_len = ovt->hsw;
 264         vm->vactive = ovt->y_res;
 265         vm->vback_porch = ovt->vbp;
 266         vm->vfront_porch = ovt->vfp;
 267         vm->vsync_len = ovt->vsw;
 268
 269         if (ovt->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 270                 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
 271         else
 272                 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
 273
 274         if (ovt->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 275                 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
 276         else
 277                 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
 278
 279         if (ovt->de_level == OMAPDSS_SIG_ACTIVE_HIGH)
 280                 vm->flags |= DISPLAY_FLAGS_DE_HIGH;
 281         else
 282                 vm->flags |= DISPLAY_FLAGS_DE_LOW;
 283
 284         if (ovt->data_pclk_edge == OMAPDSS_DRIVE_SIG_RISING_EDGE)
 285                 vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
 286         else
 287                 vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
 288 }
 289 EXPORT_SYMBOL(omap_video_timings_to_videomode);