linux-kernel - Re: [PATCH v8 02/21] pinctrl: tegra: Add write barrier after all pinctrl register writes

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Date:   Fri, 9 Aug 2019 14:39:31 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com,
        linus.walleij@...aro.org, stefan@...er.ch, mark.rutland@....com
Cc:     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,
        devicetree@...r.kernel.org, rjw@...ysocki.net,
        viresh.kumar@...aro.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v8 02/21] pinctrl: tegra: Add write barrier after all
 pinctrl register writes

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@...dia.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@...il.com>