linux-kernel - Re: [PATCH v2 02/43] drm/sun4i: frontend: Replace ARGB with XRGB as supported format

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Message-ID: <20181127083123.ok6eftf2nd4arqe5@flea>
Date:   Tue, 27 Nov 2018 09:31:23 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Chen-Yu Tsai <wens@...e.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-sunxi@...glegroups.com, Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v2 02/43] drm/sun4i: frontend: Replace ARGB with XRGB as
 supported format

On Fri, Nov 23, 2018 at 10:24:34AM +0100, Paul Kocialkowski wrote:
> The frontend documentation (for the A33) mentions that ARGB is supported
> as output, but with the alpha component always set to 0xff. In practice,
> this means that the alpha component cannot be preserved when going
> through the frontend. Since the information is lost, ARGB is not
> properly supported.
> 
> As a result, expose the matching format supported by the frontend (both
> for input and output) as XRGB instead of ARGB.
> 
> Since ARGB was the selected format for connecting the frontend to the
> backend, change it to XRGB to reflect this as well.
> 
> The A31 and A80 SoCs apparently have a bit to enable proper alpha,
> but this is not supported at this point (see the comment already in the
> code).
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

Applied, thanks!
Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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