linux-kernel - Re: [v3] drm/bridge: ti-sn65dsi86: ensure bridge suspend happens during PM sleep

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Date:   Wed, 10 Jun 2020 11:57:55 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Harigovindan P <harigovi@...eaurora.org>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Rob Clark <robdclark@...il.com>,
        Sean Paul <seanpaul@...omium.org>,
        "Kristian H. Kristensen" <hoegsberg@...omium.org>,
        Kalyan Thota <kalyan_t@...eaurora.org>, nganji@...eaurora.org,
        Sam Ravnborg <sam@...nborg.org>,
        Stephen Boyd <swboyd@...omium.org>
Subject: Re: [v3] drm/bridge: ti-sn65dsi86: ensure bridge suspend happens
 during PM sleep

Hi,

On Tue, Jun 9, 2020 at 5:05 AM Harigovindan P <harigovi@...eaurora.org> wrote:
>
> ti-sn65dsi86 bridge is enumerated as a runtime device. When
> suspend is triggered, PM core adds a refcount on all the
> devices and calls device suspend, since usage count is
> already incremented, runtime suspend will not be called
> and it kept the bridge regulators and gpios ON which resulted
> in platform not entering into XO shutdown.

The "XO shutdown" concept is a very Qualcomm-specific concept but this
bridge chip could be used on any board.  ...but I think it's fine to
leave it as-is since the meaning is clear enough.


> Add changes to force suspend on the runtime device during pm sleep.
>
> Signed-off-by: Harigovindan P <harigovi@...eaurora.org>
> ---
>
> Changes in v2:
>         - Include bridge name in the commit message and
>         remove dependent patchwork link from the commit
>         text as bridge is independent of OEM(Stephen Boyd)
>
> Changes in v3:
>         - Updating changelog to explain the need for patch
>
>  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 2 ++
>  1 file changed, 2 insertions(+)

Note that it's generally considered nice to CC folks who commented on
previous versions of the patch since they are folks who are almost
certainly interested in it.  In this case that would be me and Stephen
Boyd.

You could also, in theory, carry Stephen's Reviewed-by patch from v1
since you have fixed the subject as he requested and you have now also
fixed the commit message to have some details.

Reviewed-by: Douglas Anderson <dianders@...omium.org>