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[v2,7/9] mmc: sdhci-esdhc-imx: correct pre_div for imx6q

Message ID 1379070698-7344-8-git-send-email-b29396@freescale.com (mailing list archive)
State New, archived
Headers show

Commit Message

Aisheng Dong Sept. 13, 2013, 11:11 a.m. UTC 
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>
---
 drivers/mmc/host/sdhci-esdhc-imx.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index ed00d6d..fe48ec3 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);