linux-kernel - Re: [PATCH v2 02/11] pinctrl: mediatek: paris: Fix PIN_CONFIG_BIAS

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Date:   Tue, 8 Mar 2022 16:27:14 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>,
        Sean Wang <sean.wang@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 02/11] pinctrl: mediatek: paris: Fix PIN_CONFIG_BIAS_*
 readback

Il 08/03/22 11:09, Chen-Yu Tsai ha scritto:
> When reading back pin bias settings, if the pin is not in the
> corresponding bias state, the function should return -EINVAL.
> 
> Fix this in the mediatek-paris pinctrl library so that the read back
> state is not littered with bogus a "input bias disabled" combined with
> "pull up" or "pull down" states.
> 
> Fixes: 805250982bb5 ("pinctrl: mediatek: add pinctrl-paris that implements the vendor dt-bindings")
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

> ---
>   drivers/pinctrl/mediatek/pinctrl-paris.c | 16 ++++++----------
>   1 file changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
> index f9f9110f2107..7037560ecda9 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-paris.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
> @@ -96,20 +96,16 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
>   			err = hw->soc->bias_get_combo(hw, desc, &pullup, &ret);
>   			if (err)
>   				goto out;
> +			if (ret == MTK_PUPD_SET_R1R0_00)
> +				ret = MTK_DISABLE;
>   			if (param == PIN_CONFIG_BIAS_DISABLE) {
> -				if (ret == MTK_PUPD_SET_R1R0_00)
> -					ret = MTK_DISABLE;
> +				if (ret != MTK_DISABLE)
> +					err = -EINVAL;
>   			} else if (param == PIN_CONFIG_BIAS_PULL_UP) {
> -				/* When desire to get pull-up value, return
> -				 *  error if current setting is pull-down
> -				 */
> -				if (!pullup)
> +				if (!pullup || ret == MTK_DISABLE)
>   					err = -EINVAL;
>   			} else if (param == PIN_CONFIG_BIAS_PULL_DOWN) {
> -				/* When desire to get pull-down value, return
> -				 *  error if current setting is pull-up
> -				 */
> -				if (pullup)
> +				if (pullup || ret == MTK_DISABLE)
>   					err = -EINVAL;
>   			}
>   		} else {