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From ca19d156400f817960efe0d14680324b2ea34171 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Wed, 3 Sep 2008 19:39:47 +0800
Subject: [PATCH] fix-glamo-idleclock-around-suspend.patch
Possible implementation of SD Card corruption workaround reported here
https://docs.openmoko.org/trac/ticket/1802#comment:5
Signed-off-by: Andy Green <andy@openmoko.com>
---
drivers/mfd/glamo/glamo-mci.c | 31 ++++++++++++++++++++++++++++++-
1 files changed, 30 insertions(+), 1 deletions(-)
diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
index 577021e..3eece08 100644
--- a/drivers/mfd/glamo/glamo-mci.c
+++ b/drivers/mfd/glamo/glamo-mci.c
@@ -99,6 +99,8 @@ module_param(sd_drive, int, 0644);
static int sd_idleclk = 0; /* disallow idle clock by default */
module_param(sd_idleclk, int, 0644);
+/* used to stash real idleclk state in suspend: we force it to run in there */
+static int suspend_sd_idleclk;
unsigned char CRC7(u8 * pu8, int cnt)
@@ -947,6 +949,27 @@ static int glamo_mci_suspend(struct platform_device *dev, pm_message_t state)
struct glamo_mci_host *host = mmc_priv(mmc);
int ret;
+ /*
+ * possible workaround for SD corruption during suspend - resume
+ * make sure the clock was running during suspend and consequently
+ * resume
+ */
+ if (host->pdata->glamo_mci_use_slow)
+ if ((host->pdata->glamo_mci_use_slow)())
+ __glamo_mci_fix_card_div(host, host->clk_div *
+ sd_slow_ratio);
+ else
+ __glamo_mci_fix_card_div(host, host->clk_div);
+ else
+ __glamo_mci_fix_card_div(host, host->clk_div);
+
+ /* we are going to do more commands to override this in
+ * mmc_suspend_host(), so we need to change sd_idleclk for the
+ * duration as well
+ */
+ suspend_sd_idleclk = sd_idleclk;
+ sd_idleclk = 1;
+
host->suspending++;
if (host->pdata->mci_all_dependencies_resumed)
(host->pdata->mci_suspending)(dev);
@@ -963,6 +986,7 @@ int glamo_mci_resume(struct platform_device *dev)
{
struct mmc_host *mmc = platform_get_drvdata(dev);
struct glamo_mci_host *host = mmc_priv(mmc);
+ int ret;
if (host->pdata->mci_all_dependencies_resumed)
if (!(host->pdata->mci_all_dependencies_resumed)(dev))
@@ -970,7 +994,12 @@ int glamo_mci_resume(struct platform_device *dev)
host->suspending--;
- return mmc_resume_host(mmc);
+ ret = mmc_resume_host(mmc);
+
+ /* put sd_idleclk back to pre-suspend state */
+ sd_idleclk = suspend_sd_idleclk;
+
+ return ret;
}
EXPORT_SYMBOL_GPL(glamo_mci_resume);
--
1.5.6.5
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