linux-kernel - Re: [PATCH] drm/meson: Reduce the FIFO lines held when AFBC is not used

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Date:   Mon, 19 Dec 2022 14:39:25 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Carlo Caione <ccaione@...libre.com>
Cc:     David Airlie <airlied@...il.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Kevin Hilman <khilman@...libre.com>,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] drm/meson: Reduce the FIFO lines held when AFBC is not
 used

On 19/12/2022 12:00, Martin Blumenstingl wrote:
> Hi Carlo,
> 
> On Mon, Dec 19, 2022 at 9:43 AM Carlo Caione <ccaione@...libre.com> wrote:
>>
>> Having a bigger number of FIFO lines held after vsync is only useful to
>> SoCs using AFBC to give time to the AFBC decoder to be reset, configured
>> and enabled again.
>>
>> For SoCs not using AFBC this, on the contrary, is causing on some
>> displays issues and a few pixels vertical offset in the displayed image.
> On the 32-bit SoCs (for which VPU support is not upstream yet) it has
> caused screen tearing instead of shifting the image.
> 
>> Conditionally increase the number of lines held after vsync only for
>> SoCs using AFBC, leaving the default value for all the others.
> That was also my approach (for a not-yet-upstream patch).
> Since it's affecting already supported SoCs I suggest adding
> "Fixed-by: 24e0d4058eff ..." (maybe Neil can do so when he agrees and
> is applying the patch).
> 
> Acked-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>


Yep I'll add the Fixes tag when applying

Thank Carlo !

Acked-by: Neil Armstrong <neil.armstrong@...aro.org>