On 15/04/16 20:29, Dong Aisheng wrote: > From: Dong Aisheng <aisheng.dong@xxxxxxxxxxxxx> > > Disable DLL delay line settings explicitly during driver initialization > in case ROM/uBoot had set an invalid delay. > e.g. MX6DL ROM has set the default delay line(DLLCTRL) to 0x1000021, > the uSDHC clock timing will become marginal when works on DDR mode > due to default delay and will possibly see CRC errors in case the board > is not perfectly designed on the eMMC chip layout. > > Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx> Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> > --- > drivers/mmc/host/sdhci-esdhc-imx.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c > index 4c28fbb..d02db66 100644 > --- a/drivers/mmc/host/sdhci-esdhc-imx.c > +++ b/drivers/mmc/host/sdhci-esdhc-imx.c > @@ -1186,6 +1186,9 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev) > */ > writel(readl(host->ioaddr + 0x6c) | BIT(7), > host->ioaddr + 0x6c); > + > + /* disable DLL_CTRL delay line settings */ > + writel(0x0, host->ioaddr + ESDHC_DLL_CTRL); > } > > if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
