linux-kernel - Re: [PATCH v3 2/2] drm/sun4i: Use CRTC size instead of PRIMARY plane size as mixer frame.

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Date:   Thu, 2 Jan 2020 11:08:32 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     roman.stratiienko@...ballogic.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jernej.skrabec@...l.net
Subject: Re: [PATCH v3 2/2] drm/sun4i: Use CRTC size instead of PRIMARY plane
 size as mixer frame.

Hi,

On Wed, Jan 01, 2020 at 10:47:50PM +0200, roman.stratiienko@...ballogic.com wrote:
> From: Roman Stratiienko <roman.stratiienko@...ballogic.com>
>
> According to DRM documentation the only difference between PRIMARY
> and OVERLAY plane is that each CRTC must have PRIMARY plane and
> OVERLAY are optional.
>
> Allow PRIMARY plane to have dimension different from full-screen.
>
> Fixes: 5bb5f5dafa1a ("drm/sun4i: Reorganize UI layer code in DE2")
> Signed-off-by: Roman Stratiienko <roman.stratiienko@...ballogic.com>

So it applies to all the 4 patches you've sent, but this lacks some
context.

There's a few questions that should be answered here:
  - Which situation is it fixing?
  - What tool / userspace stack is it fixing?
  - What happens with your fix? Do you set the plane at coordinates
    0,0 (meaning you'll crop the top-lef corner), do you center it? If
    the plane is smaller than the CTRC size, what is set on the edges?

Thanks!
Maxime

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