linux-kernel - Re: [PATCH 2/2] drm/meson: fix G12A primary plane disabling

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Date:   Thu, 06 Jun 2019 10:30:11 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        dri-devel@...ts.freedesktop.org
Cc:     linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: Re: [PATCH 2/2] drm/meson: fix G12A primary plane disabling

Neil Armstrong <narmstrong@...libre.com> writes:

> The G12A Primary plane was disabled by writing in the OSD1 configuration
> registers, but this caused the plane blender to stall instead of continuing
> blended only the overlay plane.

grammar nit: "...instead of continuing to blend only the overlay plane."

> Fix this by disabling the OSD1 plane in the blender registers, and also
> enabling it back using the same register.
>
> Fixes: 490f50c109d1 ("drm/meson: Add G12A support for OSD1 Plane")
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>

Reviewed-by: Kevin Hilman <khilman@...libre.com>

As noted elsewhere, this driver is also full of magic constants used in
register writes which makes reviewing this kind of change for
correctness that much more difficult, but since that's already been
pointed out elsewhere, and it's already on your TODO list, it should not
block this important fix.

Kevin