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Date:   Thu, 12 Jul 2018 19:06:25 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     wens@...e.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, paul.kocialkowski@...tlin.com
Subject: Re: [PATCH v2] drm/sun4i: Implement zpos for DE2

On Fri, Jul 06, 2018 at 06:47:32PM +0200, Jernej Skrabec wrote:
> Initial implementation of DE2 planes only supported fixed zpos.
> 
> Expand implementation with configurable zpos property.
> 
> Implementation background:
> Channel in DE2 driver represents one DRM plane, whereas pipe is just
> mapped channel to known Z position. Pipe 0 will always be at the bottom,
> pipe 1 just above pipe 0 and so on. If, for example, channel 1 is mapped
> at pipe 0 and channel 0 at pipe 1, whatever is on channel 0 will appear
> on top.
> 
> Before this commit, channel id was used for addressing channel related
> registers (prefixed with SUN8I_MIXER_CHAN_UI_ or SUN8I_MIXER_CHAN_VI_)
> and pipe registers (prefixed with SUN8I_MIXER_BLEND_). Additionally,
> register SUN8I_MIXER_BLEND_ROUTE, which takes care for mapping channels
> to pipes had fixed value. It mapped channel 0 to pipe 0, 1 to 1 and so
> on. Consequence of all that was fixed Z order of planes.
> 
> With this commit, pipe registers are using zpos property as index and
> channel related registers still use channel id as index. Pipe mapping
> register is now set dynamically too and pipe enable register is rebuild
> every time to make sure only active pipes are enabled.
> 
> Testing was done to confirm that there is no issues if bottom plane
> contains pixels with alpha value < 0xff and if it doesn't whole screen.
> 
> Tested-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>

Applied, thanks!
Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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