diff options
| author | Dong Aisheng <b29396@freescale.com> | 2013-09-13 15:11:36 +0400 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-09-26 15:57:29 +0400 |
| commit | 5f7886c5ef40c79b5811f23219167096ab578a91 (patch) | |
| tree | 244f198da299cdccdb0e5aeae3f3c31a47d15fe9 /drivers/mmc/host/sdhci-esdhc-imx.c | |
| parent | ad93220de7da1f5bd8f9e4be1f1eeefba5eed0ad (diff) | |
| download | linux-5f7886c5ef40c79b5811f23219167096ab578a91.tar.xz | |
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>
Diffstat (limited to 'drivers/mmc/host/sdhci-esdhc-imx.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-esdhc-imx.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index ed00d6ddd5fd..fe48ec3323af 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -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); |