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

   1 /*
   2  * linux/drivers/video/omap2/dss/overlay.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 "OVERLAY"
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/err.h>
  28 #include <linux/sysfs.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/delay.h>
  31 #include <linux/slab.h>
  32
  33 #include <video/omapdss.h>
  34
  35 #include "dss.h"
  36 #include "dss_features.h"
  37
  38 static int num_overlays;
  39 static struct omap_overlay *overlays;
  40
  41 int omap_dss_get_num_overlays(void)
  42 {
  43         return num_overlays;
  44 }
  45 EXPORT_SYMBOL(omap_dss_get_num_overlays);
  46
  47 struct omap_overlay *omap_dss_get_overlay(int num)
  48 {
  49         if (num >= num_overlays)
  50                 return NULL;
  51
  52         return &overlays[num];
  53 }
  54 EXPORT_SYMBOL(omap_dss_get_overlay);
  55
  56 void dss_init_overlays(struct platform_device *pdev)
  57 {
  58         int i, r;
  59
  60         num_overlays = dss_feat_get_num_ovls();
  61
  62         overlays = kzalloc(sizeof(struct omap_overlay) * num_overlays,
  63                         GFP_KERNEL);
  64
  65         BUG_ON(overlays == NULL);
  66
  67         for (i = 0; i < num_overlays; ++i) {
  68                 struct omap_overlay *ovl = &overlays[i];
  69
  70                 switch (i) {
  71                 case 0:
  72                         ovl->name = "gfx";
  73                         ovl->id = OMAP_DSS_GFX;
  74                         break;
  75                 case 1:
  76                         ovl->name = "vid1";
  77                         ovl->id = OMAP_DSS_VIDEO1;
  78                         break;
  79                 case 2:
  80                         ovl->name = "vid2";
  81                         ovl->id = OMAP_DSS_VIDEO2;
  82                         break;
  83                 case 3:
  84                         ovl->name = "vid3";
  85                         ovl->id = OMAP_DSS_VIDEO3;
  86                         break;
  87                 }
  88
  89                 ovl->caps = dss_feat_get_overlay_caps(ovl->id);
  90                 ovl->supported_modes =
  91                         dss_feat_get_supported_color_modes(ovl->id);
  92
  93                 r = dss_overlay_kobj_init(ovl, pdev);
  94                 if (r)
  95                         DSSERR("failed to create sysfs file\n");
  96         }
  97 }
  98
  99 void dss_uninit_overlays(struct platform_device *pdev)
 100 {
 101         int i;
 102
 103         for (i = 0; i < num_overlays; ++i) {
 104                 struct omap_overlay *ovl = &overlays[i];
 105                 dss_overlay_kobj_uninit(ovl);
 106         }
 107
 108         kfree(overlays);
 109         overlays = NULL;
 110         num_overlays = 0;
 111 }
 112
 113 int dss_ovl_simple_check(struct omap_overlay *ovl,
 114                 const struct omap_overlay_info *info)
 115 {
 116         if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0) {
 117                 if (info->out_width != 0 && info->width != info->out_width) {
 118                         DSSERR("check_overlay: overlay %d doesn't support "
 119                                         "scaling\n", ovl->id);
 120                         return -EINVAL;
 121                 }
 122
 123                 if (info->out_height != 0 && info->height != info->out_height) {
 124                         DSSERR("check_overlay: overlay %d doesn't support "
 125                                         "scaling\n", ovl->id);
 126                         return -EINVAL;
 127                 }
 128         }
 129
 130         if ((ovl->supported_modes & info->color_mode) == 0) {
 131                 DSSERR("check_overlay: overlay %d doesn't support mode %d\n",
 132                                 ovl->id, info->color_mode);
 133                 return -EINVAL;
 134         }
 135
 136         if (info->zorder >= omap_dss_get_num_overlays()) {
 137                 DSSERR("check_overlay: zorder %d too high\n", info->zorder);
 138                 return -EINVAL;
 139         }
 140
 141         if (dss_feat_rotation_type_supported(info->rotation_type) == 0) {
 142                 DSSERR("check_overlay: rotation type %d not supported\n",
 143                                 info->rotation_type);
 144                 return -EINVAL;
 145         }
 146
 147         return 0;
 148 }
 149
 150 int dss_ovl_check(struct omap_overlay *ovl, struct omap_overlay_info *info,
 151                 const struct omap_video_timings *mgr_timings)
 152 {
 153         u16 outw, outh;
 154         u16 dw, dh;
 155
 156         dw = mgr_timings->x_res;
 157         dh = mgr_timings->y_res;
 158
 159         if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0) {
 160                 outw = info->width;
 161                 outh = info->height;
 162         } else {
 163                 if (info->out_width == 0)
 164                         outw = info->width;
 165                 else
 166                         outw = info->out_width;
 167
 168                 if (info->out_height == 0)
 169                         outh = info->height;
 170                 else
 171                         outh = info->out_height;
 172         }
 173
 174         if (dw < info->pos_x + outw) {
 175                 DSSERR("overlay %d horizontally not inside the display area "
 176                                 "(%d + %d >= %d)\n",
 177                                 ovl->id, info->pos_x, outw, dw);
 178                 return -EINVAL;
 179         }
 180
 181         if (dh < info->pos_y + outh) {
 182                 DSSERR("overlay %d vertically not inside the display area "
 183                                 "(%d + %d >= %d)\n",
 184                                 ovl->id, info->pos_y, outh, dh);
 185                 return -EINVAL;
 186         }
 187
 188         return 0;
 189 }
 190
 191 /*
 192  * Checks if replication logic should be used. Only use when overlay is in
 193  * RGB12U or RGB16 mode, and video port width interface is 18bpp or 24bpp
 194  */
 195 bool dss_ovl_use_replication(struct dss_lcd_mgr_config config,
 196                 enum omap_color_mode mode)
 197 {
 198         if (mode != OMAP_DSS_COLOR_RGB12U && mode != OMAP_DSS_COLOR_RGB16)
 199                 return false;
 200
 201         return config.video_port_width > 16;
 202 }