Commit 58d0bf84 authored by Yangbo Lu's avatar Yangbo Lu Committed by Ulf Hansson
Browse files

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: default avatarYangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 6079e63c

drivers/mmc/host/sdhci-of-esdhc.c

+3 −1
Original line number Diff line number Diff line
@@ -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);