linux-kernel - Re: [PATCH 06/10] drm/sun4i: Allow VI layers to be primary planes

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Date:   Mon, 11 Apr 2022 17:48:57 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Chen-Yu Tsai <wens@...e.org>, Maxime Ripard <mripard@...nel.org>,
        Samuel Holland <samuel@...lland.org>
Cc:     Samuel Holland <samuel@...lland.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 06/10] drm/sun4i: Allow VI layers to be primary planes

Dne ponedeljek, 11. april 2022 ob 06:34:18 CEST je Samuel Holland napisal(a):
> D1's mixer 1 has no UI layers, only a single VI layer. That means the
> mixer can only be used if the primary plane comes from this VI layer.
> Add the code to handle this case, setting the mixer's global registers
> in the same way as when the primary plane comes from a UI layer.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
> 
>  drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 36 +++++++++++++++++++++++++-
>  1 file changed, 35 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c b/drivers/gpu/drm/sun4i/
sun8i_vi_layer.c
> index bb7c43036dfa..86212cb2098c 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> @@ -146,6 +146,36 @@ static int sun8i_vi_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");
> +	}
> +

Above code doesn't really belong to layer management and actually cause an 
issue when primary plane is reconfigured to cover only part of display. It 
should be executed at mode set time. I already wrote patches for that. Feel 
free to reuse them:

https://github.com/jernejsk/linux-1/commit/
bddb61cfa9c8ab70f5af6ed384fc7ffe159ac064
https://github.com/jernejsk/linux-1/commit/
3320184b88df81b7d3d2b375db899442e1085519
https://github.com/jernejsk/linux-1/commit/
05a04d721ae31dbff0432606892ec94b6a63b8bc

FWIW, I have other clean ups stacked here: https://github.com/jernejsk/
linux-1/commits/hdmi-yuv420

Best regards,
Jernej

>  	/* Set height and width */
>  	DRM_DEBUG_DRIVER("Layer source offset X: %d Y: %d\n",
>  			 (state->src.x1 >> 16) & ~(format->hsub - 
1),
> @@ -542,6 +572,7 @@ struct sun8i_vi_layer *sun8i_vi_layer_init_one(struct 
drm_device *drm,
>  					       struct 
sun8i_mixer *mixer,
>  					       int index)
>  {
> +	enum drm_plane_type type = DRM_PLANE_TYPE_OVERLAY;
>  	u32 supported_encodings, supported_ranges;
>  	unsigned int plane_cnt, format_count;
>  	struct sun8i_vi_layer *layer;
> @@ -560,12 +591,15 @@ struct sun8i_vi_layer *sun8i_vi_layer_init_one(struct 
drm_device *drm,
>  		format_count = ARRAY_SIZE(sun8i_vi_layer_formats);
>  	}
>  
> +	if (!mixer->cfg->ui_num && index == 0)
> +		type = DRM_PLANE_TYPE_PRIMARY;
> +
>  	/* possible crtcs are set later */
>  	ret = drm_universal_plane_init(drm, &layer->plane, 0,
>  				       &sun8i_vi_layer_funcs,
>  				       formats, format_count,
>  				       sun8i_layer_modifiers,
> -				       DRM_PLANE_TYPE_OVERLAY, 
NULL);
> +				       type, NULL);
>  	if (ret) {
>  		dev_err(drm->dev, "Couldn't initialize layer\n");
>  		return ERR_PTR(ret);
> -- 
> 2.35.1
> 
>