On 17/04/17 14:10, Haibo Chen wrote:
> Currently for DDR50 card, it need tuning in default. We meet tuning fail
> issue for DDR50 card and some data CRC error when DDR50 sd card works.
>
> This is because the default pad I/O drive strength can't make sure DDR50
> card work stable. So increase the pad I/O drive strength for DDR50 card,
> and use pins_100mhz.
>
> Tested-and-reported-by: Tim Harvey <tharvey@xxxxxxxxxxxxx>
> Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v4.4+
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-esdhc-imx.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index cf666a0..abad67a 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -830,6 +830,7 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
>
> switch (uhs) {
> case MMC_TIMING_UHS_SDR50:
> + case MMC_TIMING_UHS_DDR50:
> pinctrl = imx_data->pins_100mhz;
> break;
> case MMC_TIMING_UHS_SDR104:
>
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