linux-kernel - Re: [PATCH 13/18] drm/mediatek: add ddp write register common api

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Date:   Thu, 27 Dec 2018 12:26:22 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Yongqiang Niu <yongqiang.niu@...iatek.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH 13/18] drm/mediatek: add ddp write register common api

Hi, Yongqiang:

On Mon, 2018-12-24 at 16:08 +0800, Yongqiang Niu wrote:
> This patch add ddp write register common api
> 

I could not see anywhere you use these function. If the function is
useless, drop this patch.

Regards,
CK

> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 24 ++++++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  9 +++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index a97e27b..1c0f9cc 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -84,6 +84,30 @@
>  #define DITHER_ADD_LSHIFT_G(x)			(((x) & 0x7) << 4)
>  #define DITHER_ADD_RSHIFT_G(x)			(((x) & 0x7) << 0)
>  
> +void mtk_ddp_write(unsigned int value, struct mtk_ddp_comp *comp,
> +		   unsigned int offset)
> +{
> +	writel(value, comp->regs + offset);
> +}
> +
> +void mtk_ddp_write_relaxed(unsigned int value,
> +			   struct mtk_ddp_comp *comp,
> +			   unsigned int offset)
> +{
> +	writel_relaxed(value, comp->regs + offset);
> +}
> +
> +void mtk_ddp_write_mask(unsigned int value,
> +			struct mtk_ddp_comp *comp,
> +			unsigned int offset,
> +			unsigned int mask)
> +{
> +	unsigned int tmp = readl(comp->regs + offset);
> +
> +	tmp = (tmp & ~mask) | (value & mask);
> +	writel(tmp, comp->regs + offset);
> +}
> +
>  void mtk_dither_set(struct mtk_ddp_comp *comp, unsigned int bpc,
>  		    unsigned int CFG)
>  {
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index f2ab0b3..b908172 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -189,5 +189,14 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *comp_node,
>  void mtk_ddp_comp_unregister(struct drm_device *drm, struct mtk_ddp_comp *comp);
>  void mtk_dither_set(struct mtk_ddp_comp *comp, unsigned int bpc,
>  		    unsigned int CFG);
> +void mtk_ddp_write(unsigned int value, struct mtk_ddp_comp *comp,
> +		   unsigned int offset);
> +void mtk_ddp_write_relaxed(unsigned int value,
> +			   struct mtk_ddp_comp *comp,
> +			   unsigned int offset);
> +void mtk_ddp_write_mask(unsigned int value,
> +			struct mtk_ddp_comp *comp,
> +			unsigned int offset,
> +			unsigned int mask);
>  
>  #endif /* MTK_DRM_DDP_COMP_H */