linux-kernel - Re: [PATCH V4 03/18] gpio: tegra: use resume

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Message-ID: <CACRpkda0=HeRco8kExdf6TmiLOnCec3Ek06s-MdjNJvVGw3ZNQ@mail.gmail.com>
Date:   Tue, 25 Jun 2019 15:38:29 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Sowjanya Komatineni <skomatineni@...dia.com>
Cc:     "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Stefan Agner <stefan@...er.ch>,
        Mark Rutland <mark.rutland@....com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        jckuo@...dia.com, Joseph Lo <josephl@...dia.com>, talho@...dia.com,
        linux-tegra@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mikko Perttunen <mperttunen@...dia.com>, spatra@...dia.com,
        Rob Herring <robh+dt@...nel.org>,
        Dmitry Osipenko <digetx@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH V4 03/18] gpio: tegra: use resume_noirq for tegra gpio resume

On Mon, Jun 24, 2019 at 5:03 AM Sowjanya Komatineni
<skomatineni@...dia.com> wrote:

> During SC7 resume, PARKED bit clear from the pinmux registers may
> cause a glitch on the GPIO lines.
>
> So, Tegra GPIOs restore should happen prior to restoring Tegra pinmux
> to keep the GPIO lines in a known good state prior to clearing PARKED
> bit.
>
> This patch has fix for this by moving Tegra GPIOs restore to happen
> very early than pinctrl resume.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>

Can this patch be applied in isolation from the other patches?

WOuld be nice to have at least Thierry's ACK on it before I
apply it.

Yours,
Linus Walleij