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Fix wrong sdhci host control register read and write 

The patch fixes the improper read and write of sdhci
host control register for sdma transfer.

The problem comes when reading and writing 1 byte long
host control register with the sdhci_readl() and
sdhci_writel(). The misuse of these functions overwrite
the value of the next registers which are in 4 bytes boundary.

This patch replaces four byte register read/write functions
with one byte read/write ones. Beside, it eliminates
unnecessary bit operation. i.e. or-ing zero against a variable.

Signed-off-by: Juhyun (Justin) Oh <Juhyun_Oh@sigmadesigns.com>
This commit is contained in:
Juhyun \(Justin\) Oh 2013-09-13 18:06:00 +00:00 committed by Pantelis Antoniou
parent e8232fea41
commit 2c011847c1
1 changed files with 2 additions and 3 deletions
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5
drivers/mmc/sdhci.c
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@ -68,10 +68,9 @@ static int sdhci_transfer_data(struct sdhci_host *host, struct mmc_data *data,
unsigned int stat, rdy, mask, timeout, block = 0;
#ifdef CONFIG_MMC_SDMA
unsigned char ctrl;
ctrl = sdhci_readl(host, SDHCI_HOST_CONTROL);
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
ctrl &= ~SDHCI_CTRL_DMA_MASK;
ctrl |= SDHCI_CTRL_SDMA;
sdhci_writel(host, ctrl, SDHCI_HOST_CONTROL);
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
#endif
timeout = 1000000;