Re: [PATCH v24 04/10] soc: mediatek: add mtk_mmsys_update_bits API

[Matthias Brugger]

On 22/06/2022 15:08, Nancy.Lin wrote:
> Add mtk_mmsys_update_bits API. Simplify code for update  mmsys reg.
> It is a preparation for adding support for mmsys config API.
>
> Signed-off-by: Nancy.Lin <nancy.lin@xxxxxxxxxxxx>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
> Reviewed-by: CK Hu <ck.hu@xxxxxxxxxxxx>
> Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
> Tested-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>
> ---
>   drivers/soc/mediatek/mtk-mmsys.c | 37 +++++++++++++-------------------
>   1 file changed, 15 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
> index a74c86197d6a..ca5bf07114fa 100644
> --- a/drivers/soc/mediatek/mtk-mmsys.c
> +++ b/drivers/soc/mediatek/mtk-mmsys.c
> @@ -192,22 +192,27 @@ static int mtk_mmsys_find_match_drvdata(struct mtk_mmsys *mmsys,
>   	return -EINVAL;
>   }
>   
> +static void mtk_mmsys_update_bits(struct mtk_mmsys *mmsys, u32 offset, u32 mask, u32 val)
> +{
> +	u32 tmp;
> +
> +	tmp = readl_relaxed(mmsys->regs + offset);
> +	tmp = (tmp & ~mask) | val;
> +	writel_relaxed(tmp, mmsys->regs + offset);
> +}
> +
>   void mtk_mmsys_ddp_connect(struct device *dev,
>   			   enum mtk_ddp_comp_id cur,
>   			   enum mtk_ddp_comp_id next)
>   {
>   	struct mtk_mmsys *mmsys = dev_get_drvdata(dev);
>   	const struct mtk_mmsys_routes *routes = mmsys->data->routes;
> -	u32 reg;
>   	int i;
>   
>   	for (i = 0; i < mmsys->data->num_routes; i++)
> -		if (cur == routes[i].from_comp && next == routes[i].to_comp) {
> -			reg = readl_relaxed(mmsys->regs + routes[i].addr);
> -			reg &= ~routes[i].mask;
> -			reg |= routes[i].val;
> -			writel_relaxed(reg, mmsys->regs + routes[i].addr);
> -		}
> +		if (cur == routes[i].from_comp && next == routes[i].to_comp)
> +			mtk_mmsys_update_bits(mmsys, routes[i].addr, routes[i].mask,
> +					      routes[i].val);
>   }
>   EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_connect);
>   
> @@ -217,15 +222,11 @@ void mtk_mmsys_ddp_disconnect(struct device *dev,
>   {
>   	struct mtk_mmsys *mmsys = dev_get_drvdata(dev);
>   	const struct mtk_mmsys_routes *routes = mmsys->data->routes;
> -	u32 reg;
>   	int i;
>   
>   	for (i = 0; i < mmsys->data->num_routes; i++)
> -		if (cur == routes[i].from_comp && next == routes[i].to_comp) {
> -			reg = readl_relaxed(mmsys->regs + routes[i].addr);
> -			reg &= ~routes[i].mask;
> -			writel_relaxed(reg, mmsys->regs + routes[i].addr);
> -		}
> +		if (cur == routes[i].from_comp && next == routes[i].to_comp)
> +			mtk_mmsys_update_bits(mmsys, routes[i].addr, routes[i].mask, 0);
>   }
>   EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_disconnect);
>   
> @@ -234,18 +235,10 @@ static int mtk_mmsys_reset_update(struct reset_controller_dev *rcdev, unsigned l
>   {
>   	struct mtk_mmsys *mmsys = container_of(rcdev, struct mtk_mmsys, rcdev);
>   	unsigned long flags;
> -	u32 reg;
>   
>   	spin_lock_irqsave(&mmsys->lock, flags);
>   
> -	reg = readl_relaxed(mmsys->regs + mmsys->data->sw0_rst_offset);
> -
> -	if (assert)
> -		reg &= ~BIT(id);
> -	else
> -		reg |= BIT(id);
> -
> -	writel_relaxed(reg, mmsys->regs + mmsys->data->sw0_rst_offset);
> +	mtk_mmsys_update_bits(mmsys, mmsys->data->sw0_rst_offset, BIT(id), assert ? 0 : BIT(id));

Let's be this a normal if (assert) else but calling mtk_mmsys_update_bits().

Other then that patch looks good.

Matthias

>   
>   	spin_unlock_irqrestore(&mmsys->lock, flags);
>