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SubjectRe: [PATCH v28 05/11] soc: mediatek: refine code to use mtk_mmsys_update_bits API
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On 07/11/2022 08:22, Nancy.Lin wrote:
> Simplify code for update mmsys reg.
>
> Signed-off-by: Nancy.Lin <nancy.lin@mediatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> Reviewed-by: CK Hu <ck.hu@mediatek.com>
> Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> Tested-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
> Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
> ---
> drivers/soc/mediatek/mtk-mmsys.c | 45 ++++++++++++--------------------
> 1 file changed, 16 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
> index 9a327eb5d9d7..73c8bd27e6ae 100644
> --- a/drivers/soc/mediatek/mtk-mmsys.c
> +++ b/drivers/soc/mediatek/mtk-mmsys.c
> @@ -99,22 +99,27 @@ struct mtk_mmsys {
> struct reset_controller_dev rcdev;
> };
>
> +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 & mask);

I'm not sure about the change in the implementation of mtk_mmsys_update_bits().
Nicolas tried to explain it to me on IRC but I wasn't totally convincing. As we
have to go for at least another round of this patches, I'd like to get a clear
understanding while it is needed that val bits are set to 1 in the mask.

Regards,
Matthias

> + 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);
>
> @@ -124,27 +129,14 @@ 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);
>
> -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_dpi_fmt_config(struct device *dev, u32 val)
> {
> if (val)
> @@ -161,18 +153,13 @@ 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);
> + mtk_mmsys_update_bits(mmsys, mmsys->data->sw0_rst_offset, BIT(id), 0);
> 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), BIT(id));
>
> spin_unlock_irqrestore(&mmsys->lock, flags);
>

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