From: Yangbo Lu <yangbo.lu@xxxxxxx> 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@xxxxxxx> --- Change in v5: rebase this patch drivers/mmc/host/sdhci-of-esdhc.c | 4 +++- 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 d01e527..2ade71e 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); -- 1.7.1
