target/linux/s3c24xx/patches-2.6.24/1285-fix-glamo-idleclock-around-suspend.patch.patch

   1 From ca19d156400f817960efe0d14680324b2ea34171 Mon Sep 17 00:00:00 2001
   2 From: Andy Green <andy@openmoko.com>
   3 Date: Wed, 3 Sep 2008 19:39:47 +0800
   4 Subject: [PATCH] fix-glamo-idleclock-around-suspend.patch
   5
   6 Possible implementation of SD Card corruption workaround reported here
   7
   8 https://docs.openmoko.org/trac/ticket/1802#comment:5
   9
  10 Signed-off-by: Andy Green <andy@openmoko.com>
  11 ---
  12  drivers/mfd/glamo/glamo-mci.c |   31 ++++++++++++++++++++++++++++++-
  13  1 files changed, 30 insertions(+), 1 deletions(-)
  14
  15 diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
  16 index 577021e..3eece08 100644
  17 --- a/drivers/mfd/glamo/glamo-mci.c
  18 +++ b/drivers/mfd/glamo/glamo-mci.c
  19 @@ -99,6 +99,8 @@ module_param(sd_drive, int, 0644);
  20  static int sd_idleclk = 0; /* disallow idle clock by default */
  21  module_param(sd_idleclk, int, 0644);
  22
  23 +/* used to stash real idleclk state in suspend: we force it to run in there */
  24 +static int suspend_sd_idleclk;
  25
  26
  27  unsigned char CRC7(u8 * pu8, int cnt)
  28 @@ -947,6 +949,27 @@ static int glamo_mci_suspend(struct platform_device *dev, pm_message_t state)
  29         struct glamo_mci_host   *host = mmc_priv(mmc);
  30         int ret;
  31
  32 +       /*
  33 +        * possible workaround for SD corruption during suspend - resume
  34 +        * make sure the clock was running during suspend and consequently
  35 +        * resume
  36 +        */
  37 +       if (host->pdata->glamo_mci_use_slow)
  38 +               if ((host->pdata->glamo_mci_use_slow)())
  39 +                       __glamo_mci_fix_card_div(host, host->clk_div *
  40 +                                                                sd_slow_ratio);
  41 +               else
  42 +                       __glamo_mci_fix_card_div(host, host->clk_div);
  43 +       else
  44 +               __glamo_mci_fix_card_div(host, host->clk_div);
  45 +
  46 +       /* we are going to do more commands to override this in
  47 +        * mmc_suspend_host(), so we need to change sd_idleclk for the
  48 +        * duration as well
  49 +        */
  50 +       suspend_sd_idleclk = sd_idleclk;
  51 +       sd_idleclk = 1;
  52 +
  53         host->suspending++;
  54         if (host->pdata->mci_all_dependencies_resumed)
  55                 (host->pdata->mci_suspending)(dev);
  56 @@ -963,6 +986,7 @@ int glamo_mci_resume(struct platform_device *dev)
  57  {
  58         struct mmc_host *mmc = platform_get_drvdata(dev);
  59         struct glamo_mci_host   *host = mmc_priv(mmc);
  60 +       int ret;
  61
  62         if (host->pdata->mci_all_dependencies_resumed)
  63                 if (!(host->pdata->mci_all_dependencies_resumed)(dev))
  64 @@ -970,7 +994,12 @@ int glamo_mci_resume(struct platform_device *dev)
  65
  66         host->suspending--;
  67
  68 -       return mmc_resume_host(mmc);
  69 +       ret = mmc_resume_host(mmc);
  70 +
  71 +       /* put sd_idleclk back to pre-suspend state */
  72 +       sd_idleclk = suspend_sd_idleclk;
  73 +
  74 +       return ret;
  75  }
  76  EXPORT_SYMBOL_GPL(glamo_mci_resume);
  77
  78 --
  79 1.5.6.5
  80