linux-kernel - Re: [PATCH v2 05/12] drm/rockchip: vop2: Set YUV/RGB overlay mode

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Message-ID: <20231127141632.GF977968@pengutronix.de>
Date:   Mon, 27 Nov 2023 15:16:32 +0100
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     Andy Yan <andyshrk@....com>
Cc:     heiko@...ech.de, hjc@...k-chips.com,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, sebastian.reichel@...labora.com,
        kever.yang@...k-chips.com, chris.obbard@...labora.com,
        Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH v2 05/12] drm/rockchip: vop2: Set YUV/RGB overlay mode

On Wed, Nov 22, 2023 at 08:54:38PM +0800, Andy Yan wrote:
> From: Andy Yan <andy.yan@...k-chips.com>
> 
> Set overlay mode register according to the
> output mode is yuv or rgb.
> 
> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
> ---
> 
> (no changes since v1)
> 
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.h  |  1 +
>  drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 19 ++++++++++++++++---
>  2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> index 3d8ab2defa1b..7a58c5c9d4ec 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> @@ -51,6 +51,7 @@ struct rockchip_crtc_state {
>  	u32 bus_format;
>  	u32 bus_flags;
>  	int color_space;
> +	bool yuv_overlay;

This struct already contains a bool type variable. Please add this one
next to it to keep the struct size smaller.

>  };
>  #define to_rockchip_crtc_state(s) \
>  		container_of(s, struct rockchip_crtc_state, base)
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> index a019cc9bbd54..b32a291c5caa 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> @@ -1612,6 +1612,8 @@ static void vop2_crtc_atomic_enable(struct drm_crtc *crtc,
>  
>  	vop2->enable_count++;
>  
> +	vcstate->yuv_overlay = is_yuv_output(vcstate->bus_format);
> +
>  	vop2_crtc_enable_irq(vp, VP_INT_POST_BUF_EMPTY);
>  
>  	polflags = 0;
> @@ -1639,7 +1641,7 @@ static void vop2_crtc_atomic_enable(struct drm_crtc *crtc,
>  	if (vop2_output_uv_swap(vcstate->bus_format, vcstate->output_mode))
>  		dsp_ctrl |= RK3568_VP_DSP_CTRL__DSP_RB_SWAP;
>  
> -	if (is_yuv_output(vcstate->bus_format))
> +	if (vcstate->yuv_overlay)
>  		dsp_ctrl |= RK3568_VP_DSP_CTRL__POST_DSP_OUT_R2Y;
>  
>  	vop2_dither_setup(crtc, &dsp_ctrl);
> @@ -1948,10 +1950,12 @@ static void vop2_setup_layer_mixer(struct vop2_video_port *vp)
>  	u16 hdisplay;
>  	u32 bg_dly;
>  	u32 pre_scan_dly;
> +	u32 ovl_ctrl;
>  	int i;
>  	struct vop2_video_port *vp0 = &vop2->vps[0];
>  	struct vop2_video_port *vp1 = &vop2->vps[1];
>  	struct vop2_video_port *vp2 = &vop2->vps[2];
> +	struct rockchip_crtc_state *vcstate = to_rockchip_crtc_state(vp->crtc.state);
>  
>  	adjusted_mode = &vp->crtc.state->adjusted_mode;
>  	hsync_len = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
> @@ -1964,7 +1968,14 @@ static void vop2_setup_layer_mixer(struct vop2_video_port *vp)
>  	pre_scan_dly = ((bg_dly + (hdisplay >> 1) - 1) << 16) | hsync_len;
>  	vop2_vp_write(vp, RK3568_VP_PRE_SCAN_HTIMING, pre_scan_dly);
>  
> -	vop2_writel(vop2, RK3568_OVL_CTRL, 0);
> +	ovl_ctrl = vop2_readl(vop2, RK3568_OVL_CTRL);
> +	if (vcstate->yuv_overlay)
> +		ovl_ctrl |= BIT(vp->id);
> +	else
> +		ovl_ctrl &= ~BIT(vp->id);

Some

#define RK3568_OVL_CTRL__YUV_MODE(vp)	BIT(vp)

Would be nice.

> +
> +	vop2_writel(vop2, RK3568_OVL_CTRL, ovl_ctrl);

Is it necessary to write this register twice?

> +
>  	port_sel = vop2_readl(vop2, RK3568_OVL_PORT_SEL);
>  	port_sel &= RK3568_OVL_PORT_SEL__SEL_PORT;
>  
> @@ -2036,9 +2047,11 @@ static void vop2_setup_layer_mixer(struct vop2_video_port *vp)
>  		layer_sel |= RK3568_OVL_LAYER_SEL__LAYER(nlayer + ofs, 5);
>  	}
>  
> +	ovl_ctrl |= RK3568_OVL_CTRL__LAYERSEL_REGDONE_IMD;
> +
>  	vop2_writel(vop2, RK3568_OVL_LAYER_SEL, layer_sel);
>  	vop2_writel(vop2, RK3568_OVL_PORT_SEL, port_sel);
> -	vop2_writel(vop2, RK3568_OVL_CTRL, RK3568_OVL_CTRL__LAYERSEL_REGDONE_IMD);
> +	vop2_writel(vop2, RK3568_OVL_CTRL, ovl_ctrl);

Sascha

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