linux-kernel - Re: [PATCH v3, 20/27] drm/mediatek: add background color input select function for ovl/ovl

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Message-ID: <1560488795.16718.18.camel@mtksdaap41>
Date:   Fri, 14 Jun 2019 13:06:35 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     <yongqiang.niu@...iatek.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....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 v3, 20/27] drm/mediatek: add background color input
 select function for ovl/ovl_2l

Hi, Yongqiang:

On Wed, 2019-06-05 at 19:42 +0800, yongqiang.niu@...iatek.com wrote:
> From: Yongqiang Niu <yongqiang.niu@...iatek.com>
> 
> This patch add background color input select function for ovl/ovl_2l
> 
> ovl include 4 DRAM layer and 1 background color layer
> ovl_2l include 4 DRAM layer and 1 background color layer
> DRAM layer frame buffer data from render hardware, GPU for example.
> backgournd color layer is embed in ovl/ovl_2l, we can only set
> it color, but not support DRAM frame buffer.
> 
> for ovl0->ovl0_2l direct link usecase,
> we need set ovl0_2l background color intput select from ovl0
> if render send DRAM buffer layer number <=4, all these layer read
> by ovl.
> layer0 is at the bottom of all layers.
> layer3 is at the top of all layers.
> if render send DRAM buffer layer numbfer >=4 && <=6
> ovl0 read layer0~3
> ovl0_2l read layer4~5
> layer5 is at the top ot all these layers.
> 
> the decision of how to setting ovl0/ovl0_2l read these layer data
> is controlled in mtk crtc, which will be another patch
> 
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index a0ab760..b5a9907 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -27,6 +27,8 @@
>  #define DISP_REG_OVL_EN				0x000c
>  #define DISP_REG_OVL_RST			0x0014
>  #define DISP_REG_OVL_ROI_SIZE			0x0020
> +#define DISP_REG_OVL_DATAPATH_CON		0x0024
> +#define OVL_BGCLR_SEL_IN				BIT(2)
>  #define DISP_REG_OVL_ROI_BGCLR			0x0028
>  #define DISP_REG_OVL_SRC_CON			0x002c
>  #define DISP_REG_OVL_CON(n)			(0x0030 + 0x20 * (n))
> @@ -245,6 +247,25 @@ static void mtk_ovl_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
>  		mtk_ovl_layer_on(comp, idx);
>  }
>  
> +static void mtk_ovl_bgclr_in_on(struct mtk_ddp_comp *comp,
> +				enum mtk_ddp_comp_id prev)

prev is useless, so remove it.

Regards,
CK

> +{
> +	unsigned int reg;
> +
> +	reg = readl(comp->regs + DISP_REG_OVL_DATAPATH_CON);
> +	reg = reg | OVL_BGCLR_SEL_IN;
> +	writel(reg, comp->regs + DISP_REG_OVL_DATAPATH_CON);
> +}
> +
> +static void mtk_ovl_bgclr_in_off(struct mtk_ddp_comp *comp)
> +{
> +	unsigned int reg;
> +
> +	reg = readl(comp->regs + DISP_REG_OVL_DATAPATH_CON);
> +	reg = reg & ~OVL_BGCLR_SEL_IN;
> +	writel(reg, comp->regs + DISP_REG_OVL_DATAPATH_CON);
> +}
> +
>  static const struct mtk_ddp_comp_funcs mtk_disp_ovl_funcs = {
>  	.config = mtk_ovl_config,
>  	.start = mtk_ovl_start,
> @@ -255,6 +276,8 @@ static void mtk_ovl_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
>  	.layer_on = mtk_ovl_layer_on,
>  	.layer_off = mtk_ovl_layer_off,
>  	.layer_config = mtk_ovl_layer_config,
> +	.bgclr_in_on = mtk_ovl_bgclr_in_on,
> +	.bgclr_in_off = mtk_ovl_bgclr_in_off,
>  };
>  
>  static int mtk_disp_ovl_bind(struct device *dev, struct device *master,