linux-kernel - Re: [PATCH v4 2/2] drm/sun4i: Use CRTC size instead of primary plane size as mixer frame

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Message-ID: <2057488.cpEgfWUaUY@kista>
Date:   Mon, 31 May 2021 19:43:42 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-kernel@...r.kernel.org,
        Roman Stratiienko <r.stratiienko@...il.com>, megous@...ous.com
Cc:     mripard@...nel.org, wens@...e.org, linux-sunxi@...glegroups.com,
        dri-devel@...ts.freedesktop.org,
        Roman Stratiienko <r.stratiienko@...il.com>
Subject: Re: [PATCH v4 2/2] drm/sun4i: Use CRTC size instead of primary plane size as mixer frame

Hi!

General note, you should send Allwinner specific patches to linux-
sunxi@...ts.linux.dev too. It's already in MAINTAINERS, but probably it's not 
yet propagated in all trees.

Dne petek, 28. maj 2021 ob 22:30:36 CEST je Roman Stratiienko napisal(a):
> Fixes corrupted display picture when primary plane isn't full-screen.

You should expand this a bit more. Most importantly why this fixes a bug? Rule 
of thumb - if you used word "fix" in commit message, most of the time you 
should add Fixes tag too.

> 
> Signed-off-by: Roman Stratiienko <r.stratiienko@...il.com>
> ---
>  drivers/gpu/drm/sun4i/sun8i_mixer.c    | 28 ++++++++++++++++++++++++
>  drivers/gpu/drm/sun4i/sun8i_ui_layer.c | 30 --------------------------
>  2 files changed, 28 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/
sun8i_mixer.c
> index 5b42cf25cc86..810c731566c0 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
> @@ -248,6 +248,33 @@ int sun8i_mixer_drm_format_to_hw(u32 format, u32 
*hw_format)
>  	return -EINVAL;
>  }
>  
> +static void sun8i_mode_set(struct sunxi_engine *engine,
> +			   struct drm_display_mode *mode)
> +{
> +	u32 size = SUN8I_MIXER_SIZE(mode->crtc_hdisplay, mode-
>crtc_vdisplay);

CRTC variants are not appropriate here. These are adjusted for interlacing and 
other stuff. This is important during TCON configuration, not here. Just drop 
"crtc_" prefix.

Best regards,
Jernej

> +	struct sun8i_mixer *mixer = engine_to_sun8i_mixer(engine);
> +	u32 bld_base = sun8i_blender_base(mixer);
> +	u32 val;
> +
> +	DRM_DEBUG_DRIVER("Mode change, updating global size W: %u H: %u\n",
> +			 mode->crtc_hdisplay, mode->crtc_vdisplay);
> +	regmap_write(mixer->engine.regs, SUN8I_MIXER_GLOBAL_SIZE, size);
> +	regmap_write(mixer->engine.regs,
> +		     SUN8I_MIXER_BLEND_OUTSIZE(bld_base), size);
> +
> +	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> +		val = SUN8I_MIXER_BLEND_OUTCTL_INTERLACED;
> +	else
> +		val = 0;
> +
> +	regmap_update_bits(mixer->engine.regs,
> +			   SUN8I_MIXER_BLEND_OUTCTL(bld_base),
> +			   SUN8I_MIXER_BLEND_OUTCTL_INTERLACED,
> +			   val);
> +	DRM_DEBUG_DRIVER("Switching display mixer interlaced mode %s\n",
> +			 val ? "on" : "off");
> +}
> +
>  static void sun8i_mixer_commit(struct sunxi_engine *engine)
>  {
>  	DRM_DEBUG_DRIVER("Committing changes\n");
> @@ -301,6 +328,7 @@ static struct drm_plane **sun8i_layers_init(struct 
drm_device *drm,
>  static const struct sunxi_engine_ops sun8i_engine_ops = {
>  	.commit		= sun8i_mixer_commit,
>  	.layers_init	= sun8i_layers_init,
> +	.mode_set	= sun8i_mode_set,
>  };
>  
>  static const struct regmap_config sun8i_mixer_regmap_config = {
> diff --git a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c b/drivers/gpu/drm/sun4i/
sun8i_ui_layer.c
> index 0db164a774a1..d66fff582278 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
> @@ -120,36 +120,6 @@ static int sun8i_ui_layer_update_coord(struct 
sun8i_mixer *mixer, int channel,
>  	insize = SUN8I_MIXER_SIZE(src_w, src_h);
>  	outsize = SUN8I_MIXER_SIZE(dst_w, dst_h);
>  
> -	if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
> -		bool interlaced = false;
> -		u32 val;
> -
> -		DRM_DEBUG_DRIVER("Primary layer, updating global size 
W: %u H: %u\n",
> -				 dst_w, dst_h);
> -		regmap_write(mixer->engine.regs,
> -			     SUN8I_MIXER_GLOBAL_SIZE,
> -			     outsize);
> -		regmap_write(mixer->engine.regs,
> -			     SUN8I_MIXER_BLEND_OUTSIZE(bld_base), 
outsize);
> -
> -		if (state->crtc)
> -			interlaced = state->crtc->state-
>adjusted_mode.flags
> -				& DRM_MODE_FLAG_INTERLACE;
> -
> -		if (interlaced)
> -			val = SUN8I_MIXER_BLEND_OUTCTL_INTERLACED;
> -		else
> -			val = 0;
> -
> -		regmap_update_bits(mixer->engine.regs,
> -				   
SUN8I_MIXER_BLEND_OUTCTL(bld_base),
> -				   
SUN8I_MIXER_BLEND_OUTCTL_INTERLACED,
> -				   val);
> -
> -		DRM_DEBUG_DRIVER("Switching display mixer interlaced 
mode %s\n",
> -				 interlaced ? "on" : "off");
> -	}
> -
>  	/* Set height and width */
>  	DRM_DEBUG_DRIVER("Layer source offset X: %d Y: %d\n",
>  			 state->src.x1 >> 16, state->src.y1 >> 16);
>