Re: [PATCH] pinctrl: mediatek: Fix fallback behavior for bias_set_combo

[Chen-Yu Tsai <wenst@xxxxxxxxxxxx>]

On Thu, Jul 1, 2021 at 2:55 PM Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> wrote:
>
> Some pin doesn't support PUPD register, if it fails and fallbacks with
> bias_set_combo case, it will call mtk_pinconf_bias_set_pupd_r1_r0() to
> modify the PUPD pin again.
>
> Since the general bias set are either PU/PD or PULLSEL/PULLEN, try
> bias_set or bias_set_rev1 for this fallback case.
>
> Fixes: 81bd1579b43e ("pinctrl: mediatek: Fix fallback call path")
> Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
> ---
>  drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> index 5b3b048725cc8..0cdff487836fa 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> @@ -926,9 +926,12 @@ int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw,
>                         if (err)
>                                 return err;
>                 } else if (hw->soc->bias_set_combo) {
> -                       err = hw->soc->bias_set_combo(hw, desc, pullup, arg);
> -                       if (err)
> -                               return err;
> +                       err = mtk_pinconf_bias_set_rev1(hw, desc, pullup);
> +                       if (err) {
> +                               err = mtk_pinconf_bias_set(hw, desc, pullup);
> +                               if (err)
> +                                       return err;

You don't need to nest this. If mtk_pinconf_bias_set_rev1() succeeds,
err would be 0 and the following if blocks would all be skipped. So:

err = mtk_pinconf_bias_set_rev1();
if (err)
        err = mtk_pinconf_bias_set();
if (err)
        return err;

Moreover, maybe you should rework the test for hw->soc->bias_set_combo,
as it is no longer relevant to the code within the if block?


ChenYu

> +                       }
>                 } else {
>                         return -ENOTSUPP;
>                 }
> --
> 2.32.0.93.g670b81a890-goog
>
>
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