linux-kernel - Re: [PATCH v2] drm/msm: Fix a6xx GMU shutdown sequence

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Message-ID: <CAD=FV=U7iWY1z5mwS0FyHyAA5EoFkAYzL-HKRaFMbRkMu6ffkg@mail.gmail.com>
Date:   Thu, 6 Feb 2020 11:12:23 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     Jordan Crouse <jcrouse@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Sean Paul <sean@...rly.run>,
        Sharat Masetty <smasetty@...eaurora.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v2] drm/msm: Fix a6xx GMU shutdown sequence

Hi,

On Wed, Feb 5, 2020 at 1:00 PM Rob Clark <robdclark@...il.com> wrote:
>
> On Wed, Feb 5, 2020 at 12:48 PM Jordan Crouse <jcrouse@...eaurora.org> wrote:
> >
> > Commit e812744c5f95 ("drm: msm: a6xx: Add support for A618") missed
> > updating the VBIF flush in a6xx_gmu_shutdown and instead
> > inserted the new sequence into a6xx_pm_suspend along with a redundant
> > GMU idle.
> >
> > Move a6xx_bus_clear_pending_transactions to a6xx_gmu.c and use it in
> > the appropriate place in the shutdown routine and remove the redundant
> > idle call.
> >
> > v2: Remove newly unused variable that was triggering a warning
> >
> > Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
>
> Reviewed-by: Rob Clark <robdclark@...il.com>

Without this patch I'm seeing some really bad behavior where the whole
system will pause for a bit, especially if it has been idle.  After
this patch things are much better.  Thus:

Fixes: e812744c5f95 ("drm: msm: a6xx: Add support for A618")
Tested-by: Douglas Anderson <dianders@...omium.org>

-Doug