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mmc: sdhci-esdhc-imx: add SDHCI_TRANSFER_MODE read function 

Used to read out the correct value of SDHCI_TRANSFER_MODE register
for upper layer.

Signed-off-by: Dong Aisheng <b29396@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Dong Aisheng 2013-10-30 22:09:49 +08:00 committed by Chris Ball
parent 2b558c13df
commit 7dd109ef4f
1 changed files with 16 additions and 0 deletions
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16
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -385,6 +385,22 @@ static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
return ret;
}
if (unlikely(reg == SDHCI_TRANSFER_MODE)) {
if (esdhc_is_usdhc(imx_data)) {
u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
ret = m & ESDHC_MIX_CTRL_SDHCI_MASK;
/* Swap AC23 bit */
if (m & ESDHC_MIX_CTRL_AC23EN) {
ret &= ~ESDHC_MIX_CTRL_AC23EN;
ret |= SDHCI_TRNS_AUTO_CMD23;
}
} else {
ret = readw(host->ioaddr + SDHCI_TRANSFER_MODE);
}
return ret;
}
return readw(host->ioaddr + reg);
}