Commit de0a0dec authored Dec 27, 2018 by BOUGH CHEN Committed by Ulf Hansson Feb 25, 2019

mmc: sdhci-esdhc-imx: fix HS400 timing issue



Now tuning reset will be done when the timing is MMC_TIMING_LEGACY/
MMC_TIMING_MMC_HS/MMC_TIMING_SD_HS. But for timing MMC_TIMING_MMC_HS,
we can not do tuning reset, otherwise HS400 timing is not right.

Here is the process of init HS400, first finish tuning in HS200 mode,
then switch to HS mode and 8 bit DDR mode, finally switch to HS400
mode. If we do tuning reset in HS mode, this will cause HS400 mode
lost the tuning setting, which will cause CRC error.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Cc: stable@vger.kernel.org # v4.12+
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Fixes: d9370424 ("mmc: sdhci-esdhc-imx: reset tuning circuit when power on mmc card")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

parent de3e1dd0

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

+1 −0

Original line number	Diff line number	Diff line
		@@ -993,6 +993,7 @@ static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
		case MMC_TIMING_UHS_SDR25:
		case MMC_TIMING_UHS_SDR50:
		case MMC_TIMING_UHS_SDR104:
		case MMC_TIMING_MMC_HS:
		case MMC_TIMING_MMC_HS200:
		writel(m, host->ioaddr + ESDHC_MIX_CTRL);
		break;

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