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authoryangbo lu <yangbo.lu@freescale.com>2015-10-16 10:44:03 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2015-10-26 18:00:15 +0300
commit9e4703df3aa9829a84d6ccf19c6062ba19a8de71 (patch)
treeceb3c9d5b61e1710ef4f4eb97e1b60c88d594414 /drivers/mmc
parenta599579ee8e32daebdfa4d97b24389c680ef5789 (diff)
downloadlinux-9e4703df3aa9829a84d6ccf19c6062ba19a8de71.tar.xz
mmc: sdhci-of-esdhc: avoid writing power control register
The eSDHC doesn't have a standard power control register, so when writing this register in stack we should do nothing to avoid incorrect operation. Signed-off-by: Yangbo Lu <yangbo.lu@freescale.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci-of-esdhc.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 7b9282b6eac9..90e94a028a49 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -183,6 +183,12 @@ static u32 esdhc_writeb_fixup(struct sdhci_host *host,
int shift = (spec_reg & 0x3) * 8;
/*
+ * eSDHC doesn't have a standard power control register, so we do
+ * nothing here to avoid incorrect operation.
+ */
+ if (spec_reg == SDHCI_POWER_CONTROL)
+ return old_value;
+ /*
* "DMA select" location is offset 0x28 in SD specification, but on
* P5020 or P3041, it's located at 0x29.
*/