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Subject: Re: [PATCH v8 02/21] pinctrl: tegra: Add write barrier after all
 pinctrl register writes
To:     Sowjanya Komatineni <skomatineni@nvidia.com>,
        thierry.reding@gmail.com, jonathanh@nvidia.com, tglx@linutronix.de,
        jason@lakedaemon.net, marc.zyngier@arm.com,
        linus.walleij@linaro.org, stefan@agner.ch, mark.rutland@arm.com
Cc:     pdeschrijver@nvidia.com, pgaikwad@nvidia.com, sboyd@kernel.org,
        linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org,
        jckuo@nvidia.com, josephl@nvidia.com, talho@nvidia.com,
        linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
        mperttunen@nvidia.com, spatra@nvidia.com, robh+dt@kernel.org,
        devicetree@vger.kernel.org, rjw@rjwysocki.net,
        viresh.kumar@linaro.org, linux-pm@vger.kernel.org
References: <1565308020-31952-1-git-send-email-skomatineni@nvidia.com>
 <1565308020-31952-3-git-send-email-skomatineni@nvidia.com>
From:   Dmitry Osipenko <digetx@gmail.com>
Message-ID: <c71faafa-51db-f11a-1e56-c4b79a7468d1@gmail.com>
Date:   Fri, 9 Aug 2019 14:39:31 +0300
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09.08.2019 2:46, Sowjanya Komatineni пишет:
> This patch adds write barrier after all pinctrl register writes
> during resume to make sure all pinctrl changes are complete.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
>  drivers/pinctrl/tegra/pinctrl-tegra.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
> index 982ee634b3b1..f49fe29fb6df 100644
> --- a/drivers/pinctrl/tegra/pinctrl-tegra.c
> +++ b/drivers/pinctrl/tegra/pinctrl-tegra.c
> @@ -677,6 +677,8 @@ static int tegra_pinctrl_resume(struct device *dev)
>  			writel_relaxed(*backup_regs++, regs++);
>  	}
>  
> +	/* make sure all the pinmux register writes are complete */
> +	wmb();
>  	return 0;
>  }
>  
> 

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>