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

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Date:   Tue, 25 Jun 2019 15:40:31 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>
Cc:     jonathanh@...dia.com, tglx@...utronix.de, jason@...edaemon.net,
        marc.zyngier@....com, linus.walleij@...aro.org, stefan@...er.ch,
        mark.rutland@....com, pdeschrijver@...dia.com, pgaikwad@...dia.com,
        sboyd@...nel.org, linux-clk@...r.kernel.org,
        linux-gpio@...r.kernel.org, jckuo@...dia.com, josephl@...dia.com,
        talho@...dia.com, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, mperttunen@...dia.com,
        spatra@...dia.com, robh+dt@...nel.org, digetx@...il.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH V4 03/18] gpio: tegra: use resume_noirq for tegra gpio
 resume

On Sun, Jun 23, 2019 at 08:02:44PM -0700, Sowjanya Komatineni 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>
> ---
>  drivers/gpio/gpio-tegra.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

Acked-by: Thierry Reding <treding@...dia.com>

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