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authorYangbo Lu <yangbo.lu@nxp.com>2018-11-23 11:15:36 +0800
committerUlf Hansson <ulf.hansson@linaro.org>2018-12-17 08:26:24 +0100
commit58d0bf843b49fa99588ac9f85178bd8dfd651b53 (patch)
tree47e17dc86549e7b6876cea4f028d4d4f99e5a70e /drivers/mmc
parent6079e63cdeac804bbf3ee7301d447812e5b81d84 (diff)
downloadlinux-58d0bf843b49fa99588ac9f85178bd8dfd651b53.tar.bz2
mmc: sdhci-of-esdhc: temporary fixup for eMMC HS400 issue
Currently only LX2160A eSDHC supports eMMC HS400. According to a large number of tests, eMMC HS400 failed to work at 150MHz, and for a few boards failed to work at 175MHz. But eMMC HS400 worked fine on 200MHz. We hadn't found the root cause but setting eSDHC_DLLCFG0[DLL_FREQ_SEL] = 0 using slow delay chain seemed to resovle this issue. Let's use this as fixup for now. Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci-of-esdhc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index b73d75251f8a..b93a4556ac8c 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -623,7 +623,9 @@ static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
esdhc_clock_enable(host, true);
temp = sdhci_readl(host, ESDHC_DLLCFG0);
- temp |= ESDHC_DLL_ENABLE | ESDHC_DLL_FREQ_SEL;
+ temp |= ESDHC_DLL_ENABLE;
+ if (host->mmc->actual_clock == MMC_HS200_MAX_DTR)
+ temp |= ESDHC_DLL_FREQ_SEL;
sdhci_writel(host, temp, ESDHC_DLLCFG0);
temp = sdhci_readl(host, ESDHC_TBCTL);
sdhci_writel(host, temp | ESDHC_HS400_WNDW_ADJUST, ESDHC_TBCTL);