linux-kernel - Re: [PATCH] drm: vc4: Fix pixel-wrap issue with DVP teardown

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Message-ID: <20210706092543.ek2by2utlc75bhl5@gilmour>
Date:   Tue, 6 Jul 2021 11:25:43 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Emma Anholt <emma@...olt.net>, Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dom Cobley <dom@...pberrypi.com>
Subject: Re: [PATCH] drm: vc4: Fix pixel-wrap issue with DVP teardown

On Mon, Jun 28, 2021 at 03:05:33PM +0200, Maxime Ripard wrote:
> From: Tim Gover <tim.gover@...pberrypi.com>
> 
> Adjust the DVP enable/disable sequence to avoid a pixel getting stuck
> in an internal, non resettable FIFO within PixelValve when changing
> HDMI resolution.
> 
> The blank pixels features of the DVP can prevent signals back to
> pixelvalve causing it to not clear the FIFO. Adjust the ordering
> and timing of operations to ensure the clear signal makes it through to
> pixelvalve.
> 
> Signed-off-by: Tim Gover <tim.gover@...pberrypi.com>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

Applied

Maxime

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