linux-kernel - Re: [PATCH v5 01/20] drm/panel: panel-simple: Add missing pm_runtime

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Message-ID: <CAD=FV=UX683grZ=poTwKXxSqYBCLdLAOCxOPhE_xVVgKbe36Mw@mail.gmail.com>
Date:   Thu, 29 Apr 2021 18:24:55 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>, Wolfram Sang <wsa@...nel.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        Rob Clark <robdclark@...omium.org>,
        Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Steev Klimaszewski <steev@...i.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 01/20] drm/panel: panel-simple: Add missing
 pm_runtime_disable() calls

Hi,

On Thu, Apr 29, 2021 at 5:58 PM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> On Fri, Apr 23, 2021 at 6:59 PM Douglas Anderson <dianders@...omium.org> wrote:
>
> > In commit 3235b0f20a0a ("drm/panel: panel-simple: Use runtime pm to
> > avoid excessive unprepare / prepare") we started using pm_runtime, but
> > my patch neglected to add the proper pm_runtime_disable(). Doh! Add
> > them now.
> >
> > Fixes: 3235b0f20a0a ("drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare")
> > Reported-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
>
> This patch as such:
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
>
> Notice however: you turn on pm runtime pm_runtime_enable()
> in panel_simple_probe() but are you ever turning it off in
> panel_simple_remove()?
>
> I think pm_runtime_disable(); need to be added there?

I'm a bit confused. You're saying that I need to add
pm_runtime_disable() to panel_simple_remove()? Doesn't this patch do
that? This patch adds two calls to pm_runtime_disable(). One of those
is in the probe error path and the other one is in
panel_simple_remove().

-Doug