target/linux/s3c24xx/patches/0244-fix-suspend-backlight-timing-gta01.patch.patch

   1 From 26a1d7115299dcb17a9e9effc780ceba58afa91b Mon Sep 17 00:00:00 2001
   2 From: Mike Westerhof <mwester@dls.net>
   3 Date: Sun, 10 Aug 2008 09:13:46 +0100
   4 Subject: [PATCH] fix-suspend-backlight-timing-gta01.patch
   5
   6     This patch adds the gta01 backlight callback that defers the
   7     restoring of the backlight until after the jbt driver has
   8     resumed.  This doesn't eliminate the flashing of the LCD on
   9     the gta01, but it reduces it considerably.
  10
  11 Signed-off-by: Mike Westerhof <mwester@dls.net>
  12 ---
  13  arch/arm/mach-s3c2410/mach-gta01.c   |    9 ++++++++-
  14  drivers/video/backlight/gta01_bl.c   |   15 ++++++++++++++-
  15  include/asm-arm/arch-s3c2410/gta01.h |    4 ++++
  16  3 files changed, 26 insertions(+), 2 deletions(-)
  17
  18 diff --git a/arch/arm/mach-s3c2410/mach-gta01.c b/arch/arm/mach-s3c2410/mach-gta01.c
  19 index f3f87cf..9e42df0 100644
  20 --- a/arch/arm/mach-s3c2410/mach-gta01.c
  21 +++ b/arch/arm/mach-s3c2410/mach-gta01.c
  22 @@ -507,14 +507,20 @@ static struct s3c2410_ts_mach_info gta01_ts_cfg = {
  23
  24  /* SPI */
  25
  26 -void gta01_jbt6k74_reset(int devidx, int level)
  27 +static void gta01_jbt6k74_reset(int devidx, int level)
  28  {
  29         /* empty place holder; gta01 does not yet use this */
  30         printk(KERN_DEBUG "gta01_jbt6k74_reset\n");
  31  }
  32
  33 +static void gta01_jbt6k74_resuming(int devidx)
  34 +{
  35 +       gta01bl_deferred_resume();
  36 +}
  37 +
  38  const struct jbt6k74_platform_data gta01_jbt6k74_pdata = {
  39         .reset          = gta01_jbt6k74_reset,
  40 +       .resuming       = gta01_jbt6k74_resuming,
  41  };
  42
  43  static struct spi_board_info gta01_spi_board_info[] = {
  44 @@ -584,6 +590,7 @@ static struct gta01bl_machinfo backlight_machinfo = {
  45         .default_intensity      = 1,
  46         .max_intensity          = 1,
  47         .limit_mask             = 1,
  48 +       .defer_resume_backlight = 1,
  49  };
  50
  51  static struct resource gta01_bl_resources[] = {
  52 diff --git a/drivers/video/backlight/gta01_bl.c b/drivers/video/backlight/gta01_bl.c
  53 index 301ec9c..34c19c8 100644
  54 --- a/drivers/video/backlight/gta01_bl.c
  55 +++ b/drivers/video/backlight/gta01_bl.c
  56 @@ -57,6 +57,8 @@ struct gta01bl_data {
  57
  58  static struct gta01bl_data gta01bl;
  59
  60 +static int gta01bl_defer_resume_backlight;
  61 +
  62  #define GTA01BL_SUSPENDED     0x01
  63  #define GTA01BL_BATTLOW       0x02
  64
  65 @@ -132,10 +134,12 @@ static int gta01bl_suspend(struct platform_device *dev, pm_message_t state)
  66  {
  67         gta01bl_flags |= GTA01BL_SUSPENDED;
  68         gta01bl_send_intensity(gta01_backlight_device);
  69 +       neo1973_gpb_setpin(GTA01_GPIO_BACKLIGHT, 0);
  70 +       s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
  71         return 0;
  72  }
  73
  74 -static int gta01bl_resume(struct platform_device *dev)
  75 +void gta01bl_deferred_resume(void)
  76  {
  77         mutex_lock(&gta01bl.mutex);
  78         gta01bl_init_hw();
  79 @@ -143,6 +147,13 @@ static int gta01bl_resume(struct platform_device *dev)
  80
  81         gta01bl_flags &= ~GTA01BL_SUSPENDED;
  82         gta01bl_send_intensity(gta01_backlight_device);
  83 +}
  84 +EXPORT_SYMBOL_GPL(gta01bl_deferred_resume);
  85 +
  86 +static int gta01bl_resume(struct platform_device *dev)
  87 +{
  88 +       if (! gta01bl_defer_resume_backlight)
  89 +               gta01bl_deferred_resume();
  90         return 0;
  91  }
  92  #else
  93 @@ -199,6 +210,8 @@ static int __init gta01bl_probe(struct platform_device *pdev)
  94         if (!machinfo->limit_mask)
  95                 machinfo->limit_mask = -1;
  96
  97 +       gta01bl_defer_resume_backlight = machinfo->defer_resume_backlight;
  98 +
  99         gta01_backlight_device = backlight_device_register("gta01-bl",
 100                                                            &pdev->dev, NULL,
 101                                                            &gta01bl_ops);
 102 diff --git a/include/asm-arm/arch-s3c2410/gta01.h b/include/asm-arm/arch-s3c2410/gta01.h
 103 index 1cc2099..989aa55 100644
 104 --- a/include/asm-arm/arch-s3c2410/gta01.h
 105 +++ b/include/asm-arm/arch-s3c2410/gta01.h
 106 @@ -12,10 +12,14 @@
 107  #define GTA01Bv4_SYSTEM_REV    0x00000240
 108
 109  /* Backlight */
 110 +
 111 +extern void gta01bl_deferred_resume(void);
 112 +
 113  struct gta01bl_machinfo {
 114         unsigned int default_intensity;
 115         unsigned int max_intensity;
 116         unsigned int limit_mask;
 117 +       unsigned int defer_resume_backlight;
 118  };
 119
 120  /* Definitions common to all revisions */
 121 --
 122 1.5.6.3
 123