[PATCH v3 1/3] mmc: core: switch to 1V8 or 1V2 for hs400es mode

[Ulf Hansson]

On 30 September 2016 at 08:18, Shawn Lin <shawn.lin at rock-chips.com> wrote:
> When introducing hs400es, I didn't notice that we haven't
> switched voltage to 1V2 or 1V8 for it. That happens to work
> as the first controller claiming to support hs400es, arasan(5.1),
> which is designed to only support 1V8. So the voltage is fixed to 1V8.
> But it actually is wrong, and will not fit for other host controllers.
> Let's fix it.
>
> Fixes: commit 81ac2af65793ecf ("mmc: core: implement enhanced strobe support")
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
>
> Reviewed-by: Douglas Anderson <dianders at chromium.org>

Thanks, applied for fixes!

Kind regards
Uffe

> ---
>
> Changes in v3:
> - add Doug's tag
>
> Changes in v2:
> - fix copy-paste error, mea culpa
>
>  drivers/mmc/core/mmc.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 3486bc7..f4ed5ac 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1263,6 +1263,16 @@ static int mmc_select_hs400es(struct mmc_card *card)
>                 goto out_err;
>         }
>
> +       if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
> +               err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
> +
> +       if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
> +               err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
> +
> +       /* If fails try again during next card power cycle */
> +       if (err)
> +               goto out_err;
> +
>         err = mmc_select_bus_width(card);
>         if (err < 0)
>                 goto out_err;
> --
> 2.3.7
>
>
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