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mmc: sdhci-esdhc-imx: correct pre_div for imx6q 

According to spec, the pre_div for imx6q should be 1, or the biggest
clock rate we can get is a half of host clock rate.  This may cause
we can not get the proper clock rate as we want.  e.g. if the desired
clock is 200Mhz, however, the host clock is 200Mhz too, then it causes
the actual clock we get is 100Mhz due to pre_div is 2.

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 2013-09-13 19:11:36 +08:00 committed by Chris Ball
parent ad93220de7
commit 5f7886c5ef
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -510,6 +510,9 @@ static inline void esdhc_pltfm_set_clock(struct sdhci_host *host,
goto out;
}
if (is_imx6q_usdhc(imx_data))
pre_div = 1;
temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
| ESDHC_CLOCK_MASK);