[PATCH 14/23] mmc: sdhci-esdhci-imx: disable DLL delay line settings explicitly

[Adrian Hunter]

On 15/04/16 20:29, Dong Aisheng wrote:
> From: Dong Aisheng <aisheng.dong at freescale.com>
> 
> 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 at nxp.com>

Acked-by: Adrian Hunter <adrian.hunter at intel.com>

> ---
>  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)
>