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