linux-kernel - Re: [PATCH RFC v7 07/10] drm/atomic: Loosen FB atomic checks

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Date:   Tue, 5 Dec 2023 09:39:02 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Jessica Zhang <quic_jesszhan@...cinc.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        quic_abhinavk@...cinc.com, ppaalanen@...il.com,
        contact@...rsion.fr, laurent.pinchart@...asonboard.com,
        sebastian.wick@...hat.com, ville.syrjala@...ux.intel.com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        wayland-devel@...ts.freedesktop.org
Subject: Re: [PATCH RFC v7 07/10] drm/atomic: Loosen FB atomic checks

Hi,

On Fri, Oct 27, 2023 at 03:32:57PM -0700, Jessica Zhang wrote:
> Loosen the requirements for atomic and legacy commit so that, in cases
> where pixel_source != FB, the commit can still go through.
> 
> This includes adding framebuffer NULL checks in other areas to account for
> FB being NULL when non-FB pixel sources are enabled.
> 
> To disable a plane, the pixel_source must be NONE or the FB must be NULL
> if pixel_source == FB.
> 
> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>

This breaks some plane kunit tests we have:

See https://lore.kernel.org/dri-devel/20231204173536.51003-1-naresh.kamboju@linaro.org/

Maxime

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