Re: [PATCH] pinctrl: rockchip: fix restore error in resume

[Heiko Stübner <heiko@xxxxxxxxx>]

Am Dienstag, 23. Februar 2021, 07:48:07 CET schrieb Jianqun Xu:
> From: Wang Panzhenzhuan <randy.wang@xxxxxxxxxxxxxx>
> 
> The restore in resume should match to suspend which only set for RK3288
> SoCs pinctrl.
> 
> Fixes: 8dca933127024 ("pinctrl: rockchip: save and restore gpio6_c6 pinmux in suspend/resume")
> Reviewed-by: Jianqun Xu <jay.xu@xxxxxxxxxxxxxx>
> Signed-off-by: Wang Panzhenzhuan <randy.wang@xxxxxxxxxxxxxx>
> Signed-off-by: Jianqun Xu <jay.xu@xxxxxxxxxxxxxx>

Very good catch. Writing something to that register even on non-rk3288 socs
probably can cause strange effects.

Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx>

> ---
>  drivers/pinctrl/pinctrl-rockchip.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
> index aa1a1c850d05..53a0badc6b03 100644
> --- a/drivers/pinctrl/pinctrl-rockchip.c
> +++ b/drivers/pinctrl/pinctrl-rockchip.c
> @@ -3727,12 +3727,15 @@ static int __maybe_unused rockchip_pinctrl_suspend(struct device *dev)
>  static int __maybe_unused rockchip_pinctrl_resume(struct device *dev)
>  {
>  	struct rockchip_pinctrl *info = dev_get_drvdata(dev);
> -	int ret = regmap_write(info->regmap_base, RK3288_GRF_GPIO6C_IOMUX,
> -			       rk3288_grf_gpio6c_iomux |
> -			       GPIO6C6_SEL_WRITE_ENABLE);
> +	int ret;
>  
> -	if (ret)
> -		return ret;
> +	if (info->ctrl->type == RK3288) {
> +		ret = regmap_write(info->regmap_base, RK3288_GRF_GPIO6C_IOMUX,
> +				   rk3288_grf_gpio6c_iomux |
> +				   GPIO6C6_SEL_WRITE_ENABLE);
> +		if (ret)
> +			return ret;
> +	}
>  
>  	return pinctrl_force_default(info->pctl_dev);
>  }
>