linux-kernel - Re: [PATCH] drm/msm/mdp5: Fix wait-for-commit for cmd panels

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Date:   Sun, 31 Jan 2021 17:53:30 -0500
From:   Brian Masney <masneyb@...tation.org>
To:     Iskren Chernev <iskren.chernev@...il.com>
Cc:     Rob Clark <robdclark@...il.com>,
        ~postmarketos/upstreaming@...ts.sr.ht, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Emil Velikov <emil.velikov@...labora.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Lee Jones <lee.jones@...aro.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/mdp5: Fix wait-for-commit for cmd panels

On Wed, Jan 27, 2021 at 05:24:40PM +0200, Iskren Chernev wrote:
> Before the offending commit in msm_atomic_commit_tail wait_flush was
> called once per frame, after the commit was submitted. After it
> wait_flush is also called at the beginning to ensure previous
> potentially async commits are done.
> 
> For cmd panels the source of wait_flush is a ping-pong irq notifying
> a completion. The completion needs to be notified with complete_all so
> multiple waiting parties (new async committers) can proceed.
> 
> Signed-off-by: Iskren Chernev <iskren.chernev@...il.com>
> Suggested-by: Rob Clark <robdclark@...il.com>
> Fixes: 2d99ced787e3d ("drm/msm: async commit support")

Nice job tracking down this fix!

Reviewed-by: Brian Masney <masneyb@...tation.org>
Tested-by: Brian Masney <masneyb@...tation.org>