[U-Boot] [PATCH] Fix wrong sdhci host control register read and write

[Juhyun (Justin) Oh]

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 at sigmadesigns.com>
---
 drivers/mmc/sdhci.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 4261991..9740cca 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -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;