target/linux/omap/patches-3.18/0343-video-da8xx-fb-Add-API-to-register-wait-for-vsync-ca.patch

   1 From 9a1a810516ae9cb3259b898b6879901c5b44fa90 Mon Sep 17 00:00:00 2001
   2 From: Prathap M S <msprathap@ti.com>
   3 Date: Mon, 2 Sep 2013 12:05:23 +0530
   4 Subject: [PATCH 343/752] video: da8xx-fb: Add API to register wait for vsync
   5  callback
   6
   7 This patch adds APIs to register and unregister wait for vsync callback.
   8 This is derived from commit id 2d44302545da24fd22912d964102bc31a7489e97
   9 This commit id was part of 3.2 kernel sources.
  10
  11 Signed-off-by: Prathap M S <msprathap@ti.com>
  12 ---
  13  drivers/video/fbdev/da8xx-fb.c |   33 +++++++++++++++++++++++++++++++++
  14  include/video/da8xx-fb.h       |    4 ++++
  15  2 files changed, 37 insertions(+)
  16
  17 --- a/drivers/video/fbdev/da8xx-fb.c
  18 +++ b/drivers/video/fbdev/da8xx-fb.c
  19 @@ -197,6 +197,9 @@ static struct fb_fix_screeninfo da8xx_fb
  20         .accel = FB_ACCEL_NONE
  21  };
  22
  23 +static vsync_callback_t vsync_cb_handler;
  24 +static void *vsync_cb_arg;
  25 +
  26  static struct fb_videomode known_lcd_panels[] = {
  27         /* Sharp LCD035Q3DG01 */
  28         [0] = {
  29 @@ -830,6 +833,32 @@ static int lcd_init(struct da8xx_fb_par
  30         return 0;
  31  }
  32
  33 +int register_vsync_cb(vsync_callback_t handler, void *arg, int idx)
  34 +{
  35 +       if ((vsync_cb_handler == NULL) && (vsync_cb_arg == NULL)) {
  36 +               vsync_cb_arg = arg;
  37 +               vsync_cb_handler = handler;
  38 +       } else {
  39 +               return -EEXIST;
  40 +       }
  41 +
  42 +       return 0;
  43 +}
  44 +EXPORT_SYMBOL(register_vsync_cb);
  45 +
  46 +int unregister_vsync_cb(vsync_callback_t handler, void *arg, int idx)
  47 +{
  48 +       if ((vsync_cb_handler == handler) && (vsync_cb_arg == arg)) {
  49 +               vsync_cb_handler = NULL;
  50 +               vsync_cb_arg = NULL;
  51 +       } else {
  52 +               return -ENXIO;
  53 +       }
  54 +
  55 +       return 0;
  56 +}
  57 +EXPORT_SYMBOL(unregister_vsync_cb);
  58 +
  59  /* IRQ handler for version 2 of LCDC */
  60  static irqreturn_t lcdc_irq_handler_rev02(int irq, void *arg)
  61  {
  62 @@ -867,6 +896,8 @@ static irqreturn_t lcdc_irq_handler_rev0
  63                                    LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
  64                         par->vsync_flag = 1;
  65                         wake_up_interruptible(&par->vsync_wait);
  66 +                       if (vsync_cb_handler)
  67 +                               vsync_cb_handler(vsync_cb_arg);
  68                 }
  69
  70                 if (stat & LCD_END_OF_FRAME1) {
  71 @@ -942,6 +973,8 @@ static irqreturn_t lcdc_irq_handler_rev0
  72                                    LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
  73                         par->vsync_flag = 1;
  74                         wake_up_interruptible(&par->vsync_wait);
  75 +                       if (vsync_cb_handler)
  76 +                               vsync_cb_handler(vsync_cb_arg);
  77                 }
  78         }
  79
  80 --- a/include/video/da8xx-fb.h
  81 +++ b/include/video/da8xx-fb.h
  82 @@ -91,5 +91,9 @@ struct lcd_sync_arg {
  83  /* Proprietary FB_SYNC_ flags */
  84  #define FB_SYNC_CLK_INVERT 0x40000000
  85
  86 +typedef void (*vsync_callback_t)(void *arg);
  87 +int register_vsync_cb(vsync_callback_t handler, void *arg, int idx);
  88 +int unregister_vsync_cb(vsync_callback_t handler, void *arg, int idx);
  89 +
  90  #endif  /* ifndef DA8XX_FB_H */
  91