linux-kernel - Re: [PATCH v8 01/21] pinctrl: tegra: Fix write barrier placement in pmx

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Message-ID: <20190812092021.GC8903@ulmo>
Date:   Mon, 12 Aug 2019 11:20:21 +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, rjw@...ysocki.net,
        viresh.kumar@...aro.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v8 01/21] pinctrl: tegra: Fix write barrier placement in
 pmx_writel

On Thu, Aug 08, 2019 at 04:46:40PM -0700, Sowjanya Komatineni wrote:
> pmx_writel uses writel which inserts write barrier before the
> register write rather.
> 
> This patch has fix to replace writel with writel_relaxed followed
> by a write barrier to ensure write operation before the barrier
> is completed for successful pinctrl change.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/pinctrl/tegra/pinctrl-tegra.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

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

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