On 19 April 2017 at 04:53, Haibo Chen <haibo.chen@xxxxxxx> 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.
>
> This fixes DDR50 card support for IMX since DDR50 tuning was enabled from
> commit 9faac7b95ea4 ("mmc: sdhci: enable tuning for DDR50")
>
> Tested-and-reported-by: Tim Harvey <tharvey@xxxxxxxxxxxxx>
> Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v4.4+
> Acked-by: Dong Aisheng <aisheng.dong@xxxxxxx>
> Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Thanks, applied for fixes!
Kind regards
Uffe
> ---
> 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:
> --
> 1.9.1
>