[U-Boot] [PATCH 01/13] mmc: tmio: Simplify pinmux handling

[Masahiro Yamada]

On Thu, Nov 1, 2018 at 2:21 AM Marek Vasut <marek.vasut at gmail.com> wrote:
>
> The SD UHS SDR12, SDR25, SDR50, SDR104, DDR50 and MMC HS200, HS400
> modes all use 1.8V signaling, while all the legacy modes use 3.3V
> signaling. While there are extra modes which use 1.2V signaling,
> the existing hardware does not support those.
>
> Simplify the pinmux such that 3.3V signaling implies legacy mode
> pinmux and the rest implies UHS mode pinmux. This prevents the
> massive case statement from growing further. Moreover, it fixes
> an edge case where during SD 1.8V switch, the bus mode is still
> set to default while the signaling is already set to 1.8V, which
> results in an attempt to communicate with a 1.8V card using pins
> in 3.3V mode and thus communication failure.
>
> Signed-off-by: Marek Vasut <marek.vasut+renesas at gmail.com>
> Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
> ---
>  drivers/mmc/tmio-common.c | 22 +++-------------------
>  1 file changed, 3 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/mmc/tmio-common.c b/drivers/mmc/tmio-common.c
> index 138de59470..5f927c6150 100644
> --- a/drivers/mmc/tmio-common.c
> +++ b/drivers/mmc/tmio-common.c
> @@ -622,26 +622,10 @@ static void tmio_sd_set_pins(struct udevice *dev)
>  #endif
>
>  #ifdef CONFIG_PINCTRL
> -       switch (mmc->selected_mode) {
> -       case MMC_LEGACY:
> -       case SD_LEGACY:
> -       case MMC_HS:
> -       case SD_HS:
> -       case MMC_HS_52:
> -       case MMC_DDR_52:
> -               pinctrl_select_state(dev, "default");
> -               break;
> -       case UHS_SDR12:
> -       case UHS_SDR25:
> -       case UHS_SDR50:
> -       case UHS_DDR50:
> -       case UHS_SDR104:
> -       case MMC_HS_200:
> +       if (mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
>                 pinctrl_select_state(dev, "state_uhs");
> -               break;
> -       default:
> -               break;
> -       }
> +       else
> +               pinctrl_select_state(dev, "default");
>  #endif
>  }


Looks a nice clean-up
although the current code is already screwed up, I guess.

"state_uhs" is Renesas-specific DT binding
while it is sitting in the common code.





--
Best Regards
Masahiro Yamada