linux-kernel - Re: [PATCH RFC v4 7/7] drm/msm/dpu: Use DRM solid

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Message-ID: <20230630112649.263331b4@eldfell>
Date:   Fri, 30 Jun 2023 11:26:49 +0300
From:   Pekka Paalanen <ppaalanen@...il.com>
To:     Jessica Zhang <quic_jesszhan@...cinc.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Sean Paul" <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        <quic_abhinavk@...cinc.com>, <contact@...rsion.fr>,
        <laurent.pinchart@...asonboard.com>, <sebastian.wick@...hat.com>,
        <ville.syrjala@...ux.intel.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <freedreno@...ts.freedesktop.org>,
        <wayland-devel@...ts.freedesktop.org>
Subject: Re: [PATCH RFC v4 7/7] drm/msm/dpu: Use DRM solid_fill property

On Thu, 29 Jun 2023 17:25:06 -0700
Jessica Zhang <quic_jesszhan@...cinc.com> wrote:

> Drop DPU_PLANE_COLOR_FILL_FLAG and check the DRM solid_fill property to
> determine if the plane is solid fill. In addition drop the DPU plane
> color_fill field as we can now use drm_plane_state.solid_fill instead,
> and pass in drm_plane_state.alpha to _dpu_plane_color_fill_pipe() to
> allow userspace to configure the alpha value for the solid fill color.
> 
> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 21 +++++++++++++++------
>  1 file changed, 15 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> index 4476722f03bb..11d4fb771a1f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> @@ -42,7 +42,6 @@
>  #define SHARP_SMOOTH_THR_DEFAULT	8
>  #define SHARP_NOISE_THR_DEFAULT	2
>  
> -#define DPU_PLANE_COLOR_FILL_FLAG	BIT(31)
>  #define DPU_ZPOS_MAX 255
>  
>  /*
> @@ -82,7 +81,6 @@ struct dpu_plane {
>  
>  	enum dpu_sspp pipe;
>  
> -	uint32_t color_fill;
>  	bool is_error;
>  	bool is_rt_pipe;
>  	const struct dpu_mdss_cfg *catalog;
> @@ -606,6 +604,17 @@ static void _dpu_plane_color_fill_pipe(struct dpu_plane_state *pstate,
>  	_dpu_plane_setup_scaler(pipe, fmt, true, &pipe_cfg, pstate->rotation);
>  }
>  
> +static uint32_t _dpu_plane_get_fill_color(struct drm_solid_fill solid_fill)
> +{
> +	uint32_t ret = 0;
> +
> +	ret |= ((uint8_t) solid_fill.b) << 16;
> +	ret |= ((uint8_t) solid_fill.g) << 8;
> +	ret |= ((uint8_t) solid_fill.r);

solid_fill.r, g and b are uint32_t, yes?

What's the value encoding in the UAPI? That doc was missing.

I wouldn't expect the UAPI to use 32-bit variables if it was
essentially 8-bit, so this conversion looks wrong.

Nominal color value 1.0 in u8 is 0xff. The same in u32 is probably
0xffffffff? So a simple cast to u8 won't work. You'd want to take the
upper 8 bits instead.


Thanks,
pq

> +
> +	return ret;
> +}
> +
>  /**
>   * _dpu_plane_color_fill - enables color fill on plane
>   * @pdpu:   Pointer to DPU plane object
> @@ -977,9 +986,9 @@ void dpu_plane_flush(struct drm_plane *plane)
>  	if (pdpu->is_error)
>  		/* force white frame with 100% alpha pipe output on error */
>  		_dpu_plane_color_fill(pdpu, 0xFFFFFF, 0xFF);
> -	else if (pdpu->color_fill & DPU_PLANE_COLOR_FILL_FLAG)
> -		/* force 100% alpha */
> -		_dpu_plane_color_fill(pdpu, pdpu->color_fill, 0xFF);
> +	else if (drm_plane_solid_fill_enabled(plane->state))
> +		_dpu_plane_color_fill(pdpu, _dpu_plane_get_fill_color(plane->state->solid_fill),
> +				plane->state->alpha);
>  	else {
>  		dpu_plane_flush_csc(pdpu, &pstate->pipe);
>  		dpu_plane_flush_csc(pdpu, &pstate->r_pipe);
> @@ -1024,7 +1033,7 @@ static void dpu_plane_sspp_update_pipe(struct drm_plane *plane,
>  	}
>  
>  	/* override for color fill */
> -	if (pdpu->color_fill & DPU_PLANE_COLOR_FILL_FLAG) {
> +	if (drm_plane_solid_fill_enabled(plane->state)) {
>  		_dpu_plane_set_qos_ctrl(plane, pipe, false);
>  
>  		/* skip remaining processing on color fill */
> 


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