linux-kernel - drm/msm: 'pp done time out' errors after async commit changes

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Date:   Mon, 4 Nov 2019 19:01:29 -0500
From:   Brian Masney <masneyb@...tation.org>
To:     Rob Clark <robdclark@...omium.org>
Cc:     Sean Paul <sean@...rly.run>, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: drm/msm: 'pp done time out' errors after async commit changes

Hey Rob,

Since commit 2d99ced787e3 ("drm/msm: async commit support"), the frame
buffer console on my Nexus 5 began throwing these errors:

msm fd900000.mdss: pp done time out, lm=0

The display still works.

I see that mdp5_flush_commit() was introduced in commit 9f6b65642bd2
("drm/msm: add kms->flush_commit()") with a TODO comment and the commit
description mentions flushing registers. I assume that this is the
proper fix. If so, can you point me to where these registers are
defined and I can work on the mdp5 implementation.

Thanks,

Brian