linux-kernel - Re: [PATCH v5 08/14] ARM: tegra: Make outer

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Message-ID: <20190930080511.GE1518582@ulmo>
Date:   Mon, 30 Sep 2019 10:05:11 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 08/14] ARM: tegra: Make outer_disable() open-coded

On Sun, Sep 29, 2019 at 08:59:46PM +0300, Dmitry Osipenko wrote:
> The outer_disable() of Tegra's suspend code is open-coded now since
> that helper produces spurious warning message about secondary CPUs being
> online. The secondaries are actually halted by the cpuidle driver on
> entering into LP2 idle-state. This fixes a storm of warnings once LP2
> idling state is enabled on Tegra30.

If the cpuidle driver halts the secondaries, shouldn't it set it offline
then so that outer_disable() can still work correctly?

Thierry

> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  arch/arm/mach-tegra/pm.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
> index 7d9ef26e52a7..16a02937d3da 100644
> --- a/arch/arm/mach-tegra/pm.c
> +++ b/arch/arm/mach-tegra/pm.c
> @@ -146,9 +146,10 @@ static int tegra_sleep_cpu(unsigned long v2p)
>  	 * if any of secondary CPU's is online and this is the LP2-idle
>  	 * code-path only for Tegra20/30.
>  	 */
> -	if (trusted_foundations_registered())
> -		outer_disable();
> -
> +#ifdef CONFIG_OUTER_CACHE
> +	if (trusted_foundations_registered() && outer_cache.disable)
> +		outer_cache.disable();
> +#endif
>  	/*
>  	 * Note that besides of setting up CPU reset vector this firmware
>  	 * call may also do the following, depending on the FW version:
> -- 
> 2.23.0
> 

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