linux-kernel - Re: [PATCH v7 4/6] drm: Refuse to async flip with atomic prop changes

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Message-ID: <Bi9El_nuZXA997YlVyCzD5s7KfP820IVUuYiB69mgXnjQbfCgOucCBe6aKvSFrMzB_9DwxO2lli_MqLzMuGZ-rmrRp57vePsTwUarEweLJs=@emersion.fr>
Date:   Mon, 23 Oct 2023 08:27:17 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Michel Dänzer <michel.daenzer@...lbox.org>
Cc:     André Almeida <andrealmeid@...lia.com>,
        pierre-eric.pelloux-prayer@....com,
        'Marek Olšák' <maraeo@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        Pekka Paalanen <ppaalanen@...il.com>,
        dri-devel@...ts.freedesktop.org, kernel-dev@...lia.com,
        alexander.deucher@....com, hwentlan@....com,
        christian.koenig@....com, joshua@...ggi.es
Subject: Re: [PATCH v7 4/6] drm: Refuse to async flip with atomic prop changes

On Sunday, October 22nd, 2023 at 12:12, Michel Dänzer <michel.daenzer@...lbox.org> wrote:

> On 10/17/23 14:16, Simon Ser wrote:
> 
> > After discussing with André it seems like we missed a plane type check
> > here. We need to make sure FB_ID changes are only allowed on primary
> > planes.
> 
> Can you elaborate why that's needed?

Current drivers are in general not prepared to perform async page-flips
on planes other than primary. For instance I don't think i915 has logic
to perform async page-flip on an overlay plane FB_ID change.