linux-kernel - Re: [PATCH v9 0/4] drm: Add support for atomic async page-flip

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Message-ID: <50ff86d4-5ce1-4ae5-aafb-ce3bc0069629@igalia.com>
Date:   Wed, 22 Nov 2023 17:28:35 -0300
From:   André Almeida <andrealmeid@...lia.com>
To:     Hamza Mahfooz <hamza.mahfooz@....com>
Cc:     pierre-eric.pelloux-prayer@....com,
        'Marek Olšák' <maraeo@...il.com>,
        Michel Dänzer <michel.daenzer@...lbox.org>,
        intel-gfx@...ts.freedesktop.org,
        Randy Dunlap <rdunlap@...radead.org>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        Pekka Paalanen <ppaalanen@...il.com>, kernel-dev@...lia.com,
        alexander.deucher@....com, christian.koenig@....com,
        xaver.hugl@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 0/4] drm: Add support for atomic async page-flip

Hi Hamza,

Em 22/11/2023 17:23, Hamza Mahfooz escreveu:
> Hi André,
> On 11/22/23 11:19, André Almeida wrote:
>> Hi,
>>
>> This work from me and Simon adds support for DRM_MODE_PAGE_FLIP_ASYNC 
>> through
>> the atomic API. This feature is already available via the legacy API. 
>> The use
>> case is to be able to present a new frame immediately (or as soon as
>> possible), even if after missing a vblank. This might result in 
>> tearing, but
>> it's useful when a high framerate is desired, such as for gaming.
>>
>> Differently from earlier versions, this one refuses to flip if any 
>> prop changes
>> for async flips. The idea is that the fast path of immediate page 
>> flips doesn't
>> play well with modeset changes, so only the fb_id can be changed.
>>
>> Tested with:
>>   - Intel TigerLake-LP GT2
>>   - AMD VanGogh
> 
> Have you had a chance to test this with VRR enabled? Since, I suspect
> this series might break that feature.
> 

Someone asked this question in an earlier version of this patch, and the 
result is that VRR still works as expected. You can follow the thread at 
this link:

https://lore.kernel.org/lkml/b48bd1fc-fcb0-481b-8413-9210d44d709b@igalia.com/

I should have included this note at my cover letter, my bad.

Thanks,
	André