From ca19d156400f817960efe0d14680324b2ea34171 Mon Sep 17 00:00:00 2001 From: Andy Green 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 --- 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