From: Yangbo Lu <yangbo.lu@nxp.com>
Date: Fri, 23 Nov 2018 11:15:36 +0800
Subject: mmc: sdhci-of-esdhc: temporary fixup for eMMC HS400 issue
Git-commit: 58d0bf843b49fa99588ac9f85178bd8dfd651b53
Patch-mainline: v5.0-rc1
References: fate#326572
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>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/mmc/host/sdhci-of-esdhc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
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);
--
2.11.0