linux-kernel - Re: [PATCH 09/18] drm/mediatek: add component DITHER

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Message-ID: <1545815599.20265.3.camel@mtksdaap41>
Date:   Wed, 26 Dec 2018 17:13:19 +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 09/18] drm/mediatek: add component DITHER

Hi, Yongqiang:

On Mon, 2018-12-24 at 16:08 +0800, Yongqiang Niu wrote:
> This patch add component DITHER
> 

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 32 +++++++++++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  2 ++
>  2 files changed, 34 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 63f4b1e..a97e27b 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -47,6 +47,12 @@
>  #define CCORR_RELAY_MODE			BIT(0)
>  #define DISP_CCORR_SIZE				0x0030
>  
> +#define DISP_DITHER_EN				0x0000
> +#define DITHER_EN				BIT(0)
> +#define DISP_DITHER_CFG                        0x0020
> +#define DITHER_RELAY_MODE			BIT(0)
> +#define DISP_DITHER_SIZE			0x0030
> +
>  #define DISP_GAMMA_EN				0x0000
>  #define DISP_GAMMA_CFG				0x0020
>  #define DISP_GAMMA_SIZE				0x0030
> @@ -155,6 +161,24 @@ static void mtk_ccorr_stop(struct mtk_ddp_comp *comp)
>  	writel_relaxed(0x0, comp->regs + DISP_CCORR_EN);
>  }
>  
> +static void mtk_dither_config(struct mtk_ddp_comp *comp, unsigned int w,
> +			      unsigned int h, unsigned int vrefresh,
> +			      unsigned int bpc)
> +{
> +	writel(h << 16 | w, comp->regs + DISP_DITHER_SIZE);
> +	writel(DITHER_RELAY_MODE, comp->regs + DISP_DITHER_CFG);
> +}
> +
> +static void mtk_dither_start(struct mtk_ddp_comp *comp)
> +{
> +	writel(DITHER_EN, comp->regs + DISP_DITHER_EN);
> +}
> +
> +static void mtk_dither_stop(struct mtk_ddp_comp *comp)
> +{
> +	writel_relaxed(0x0, comp->regs + DISP_DITHER_EN);
> +}
> +
>  static void mtk_gamma_config(struct mtk_ddp_comp *comp, unsigned int w,
>  			     unsigned int h, unsigned int vrefresh,
>  			     unsigned int bpc)
> @@ -209,6 +233,12 @@ static void mtk_gamma_set(struct mtk_ddp_comp *comp,
>  	.stop = mtk_ccorr_stop,
>  };
>  
> +static const struct mtk_ddp_comp_funcs ddp_dither = {
> +	.config = mtk_dither_config,
> +	.start = mtk_dither_start,
> +	.stop = mtk_dither_stop,
> +};
> +
>  static const struct mtk_ddp_comp_funcs ddp_gamma = {
>  	.gamma_set = mtk_gamma_set,
>  	.config = mtk_gamma_config,
> @@ -233,6 +263,7 @@ static void mtk_gamma_set(struct mtk_ddp_comp *comp,
>  	[MTK_DISP_CCORR] = "ccorr",
>  	[MTK_DISP_AAL] = "aal",
>  	[MTK_DISP_GAMMA] = "gamma",
> +	[MTK_DISP_DITHER] = "dither",
>  	[MTK_DISP_UFOE] = "ufoe",
>  	[MTK_DSI] = "dsi",
>  	[MTK_DPI] = "dpi",
> @@ -255,6 +286,7 @@ struct mtk_ddp_comp_match {
>  	[DDP_COMPONENT_CCORR]	= { MTK_DISP_CCORR,	0, &ddp_ccorr },
>  	[DDP_COMPONENT_COLOR0]	= { MTK_DISP_COLOR,	0, NULL },
>  	[DDP_COMPONENT_COLOR1]	= { MTK_DISP_COLOR,	1, NULL },
> +	[DDP_COMPONENT_DITHER]	= { MTK_DISP_DITHER,	0, &ddp_dither },
>  	[DDP_COMPONENT_DPI0]	= { MTK_DPI,		0, NULL },
>  	[DDP_COMPONENT_DPI1]	= { MTK_DPI,		1, NULL },
>  	[DDP_COMPONENT_DSI0]	= { MTK_DSI,		0, NULL },
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index 6905647..b0064c52 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -29,6 +29,7 @@ enum mtk_ddp_comp_type {
>  	MTK_DISP_WDMA,
>  	MTK_DISP_COLOR,
>  	MTK_DISP_CCORR,
> +	MTK_DISP_DITHER,
>  	MTK_DISP_AAL,
>  	MTK_DISP_GAMMA,
>  	MTK_DISP_UFOE,
> @@ -48,6 +49,7 @@ enum mtk_ddp_comp_id {
>  	DDP_COMPONENT_CCORR,
>  	DDP_COMPONENT_COLOR0,
>  	DDP_COMPONENT_COLOR1,
> +	DDP_COMPONENT_DITHER,
>  	DDP_COMPONENT_DPI0,
>  	DDP_COMPONENT_DPI1,
>  	DDP_COMPONENT_DSI0,