linux-kernel - Re: [PATCH 01/10] drm/sun4i: Disable frontend video channel before enabling a layer

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Date:   Fri, 23 Mar 2018 10:53:04 +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,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Sean Paul <seanpaul@...omium.org>
Subject: Re: [PATCH 01/10] drm/sun4i: Disable frontend video channel before
 enabling a layer

On Wed, Mar 21, 2018 at 04:28:55PM +0100, Paul Kocialkowski wrote:
> This adds a dedicated function for disabling the layer video channel
> from the frontend to the backend. It is called automatically on an
> atomic update, as to disable the frontend by default (it will be enabled
> later on in the atomic update if necessary).
> 
> It fixes an issue when enabling a layer that uses the frontend (e.g. for
> scaling) and then reusing the same layer without the frontend. Since the
> video channel to the frontend was never disabled, the backend was still
> trying to get data from there.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

Acked-by: Maxime Ripard <maxime.ripard@...tlin.com>

Maxime

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