ENGR00174311: [MX6Q]USDHC: SD3.0 card failed to work

- add auto_tune back on pretuning to improve compatibility.

Signed-off-by: Ryan QIAN <b32804@freescale.com>

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index af2c7fc4e3ab26f71a5766b0d00e1de6a2abf694..90c4b20f4f581719cfe409960dc916accd933de9 100644 (file)
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -260,6 +260,7 @@ void esdhc_prepare_tuning(struct sdhci_host *host, u32 val)
        reg = readl(host->ioaddr + SDHCI_MIX_CTRL);
        reg |= SDHCI_MIX_CTRL_EXE_TUNE | \
                SDHCI_MIX_CTRL_SMPCLK_SEL | \
+               SDHCI_MIX_CTRL_AUTO_TUNE | \
                SDHCI_MIX_CTRL_FBCLK_SEL;
        writel(reg, host->ioaddr + SDHCI_MIX_CTRL);
        writel((val << 8), host->ioaddr + SDHCI_TUNE_CTRL_STATUS);