target/linux/s3c24xx/patches-2.6.26/0224-fix-glamo-mci-ensure-more-than-74-clocks-after-power.patch

   1 From 2e9349e8be6002955cb0ab6a6ed536f5f8041cba Mon Sep 17 00:00:00 2001
   2 From: Andy Green <andy@openmoko.com>
   3 Date: Fri, 25 Jul 2008 23:06:21 +0100
   4 Subject: [PATCH] fix-glamo-mci-ensure-more-than-74-clocks-after-power.patch
   5
   6 We are meant to run SD_CLK a little while after power-on for the SD
   7 Card, but with the no idle clock changes we didn't take care about it.
   8
   9 This makes us sleep a little bit before disabling clock if we just
  10 powered up the SD Card.
  11
  12 Signed-off-by: Andy Green <andy@openmoko.com>
  13 ---
  14  drivers/mfd/glamo/glamo-mci.c |    8 ++++++++
  15  1 files changed, 8 insertions(+), 0 deletions(-)
  16
  17 diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
  18 index 505be5f..0d82955 100644
  19 --- a/drivers/mfd/glamo/glamo-mci.c
  20 +++ b/drivers/mfd/glamo/glamo-mci.c
  21 @@ -684,6 +684,7 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
  22         struct glamo_mci_host *host = mmc_priv(mmc);
  23         int n = 0;
  24         int div;
  25 +       int powering = 0;
  26
  27         /* Set power */
  28         switch(ios->power_mode) {
  29 @@ -699,6 +700,7 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
  30                 glamo_engine_enable(glamo_mci_def_pdata.pglamo,
  31                                                         GLAMO_ENGINE_MMC);
  32                 glamo_mci_reset(host);
  33 +               powering = 1;
  34                 break;
  35
  36         case MMC_POWER_OFF:
  37 @@ -716,6 +718,12 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
  38         host->real_rate = __glamo_mci_set_card_clock(host, ios->clock, &div);
  39         host->clk_div = div;
  40
  41 +       /* after power-up, we are meant to give it >= 74 clocks so it can
  42 +        * initialize itself.  Doubt any modern cards need it but anyway...
  43 +        */
  44 +       if (powering)
  45 +               msleep(1);
  46 +
  47         if (!sd_idleclk)
  48                 /* stop the clock to card, because we are idle until transfer */
  49                 __glamo_mci_fix_card_div(host, -1);
  50 --
  51 1.5.6.3
  52