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| author | Shawn Guo <shawn.guo@linaro.org> | 2011-11-10 16:39:32 +0800 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2011-11-11 16:53:35 +0100 |
| commit | f750ba9b8db2a926c315ccfa9e95d12fe4590a22 (patch) | |
| tree | 1bdd2ce107b6a39b4797dab955a003e7a9c1e0ba /drivers | |
| parent | 1b929995ebc0f00cc56ddc14cf75a875f4d565d6 (diff) | |
| download | linux-f750ba9b8db2a926c315ccfa9e95d12fe4590a22.tar.bz2 | |
arm/imx: fix imx6q mmc error when mounting rootfs
The following error is seen in some case when mounting rootfs from
SD/MMC cards.
Waiting for root device /dev/mmcblk0p1...
mmc1: host does not support reading read-only switch. assuming write-enable.
mmc1: new high speed SDHC card at address b368
mmcblk0: mmc1:b368 SDC 3.74 GiB
mmcblk0: p1
mmc1: Timeout waiting for hardware interrupt.
mmcblk0: error -110 transferring data, sector 3678224, nr 40, cmd response 0x900, card status 0xc00
end_request: I/O error, dev mmcblk0, sector 3678225
Buffer I/O error on device mmcblk0p1, logical block 458754
lost page write due to I/O error on mmcblk0p1
This patch fixes the problem by lowering the usdhc clock and correcting
watermark configuration.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Chris Ball <cjb@laptop.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/sdhci-esdhc-imx.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index ae57769ba50d..4b976f00ea85 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -32,6 +32,7 @@ /* VENDOR SPEC register */ #define SDHCI_VENDOR_SPEC 0xC0 #define SDHCI_VENDOR_SPEC_SDIO_QUIRK 0x00000002 +#define SDHCI_WTMK_LVL 0x44 #define SDHCI_MIX_CTRL 0x48 /* @@ -476,6 +477,13 @@ static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev) if (is_imx53_esdhc(imx_data)) imx_data->flags |= ESDHC_FLAG_MULTIBLK_NO_INT; + /* + * The imx6q ROM code will change the default watermark level setting + * to something insane. Change it back here. + */ + if (is_imx6q_usdhc(imx_data)) + writel(0x08100810, host->ioaddr + SDHCI_WTMK_LVL); + boarddata = &imx_data->boarddata; if (sdhci_esdhc_imx_probe_dt(pdev, boarddata) < 0) { if (!host->mmc->parent->platform_data) { |