linux-kernel - Re: [PATCH v9 01/22] pinctrl: tegra: Fix write barrier placement in pmx

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Message-ID: <CACRpkdbTYON9nhrP1ritBNcm49u7-c190wL5zeufvUoGQt1jOw@mail.gmail.com>
Date:   Mon, 19 Aug 2019 00:20:01 +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>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        viresh kumar <viresh.kumar@...aro.org>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v9 01/22] pinctrl: tegra: Fix write barrier placement in pmx_writel

On Fri, Aug 16, 2019 at 9:42 PM Sowjanya Komatineni
<skomatineni@...dia.com> wrote:
>
> pmx_writel uses writel which inserts write barrier before the
> register write.
>
> This patch has fix to replace writel with writel_relaxed followed
> by a readback and memory barrier to ensure write operation is
> completed for successful pinctrl change.
>
> Acked-by: Thierry Reding <treding@...dia.com>
> Reviewed-by: Dmitry Osipenko <digetx@...il.com>
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>

Took out the previous patches and applied this instead.

Yours,
Linus Walleij