linux-kernel - Re: [PATCH 5/8] ARM: Exynos: use generic cpufreq driver for Exynos5420

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Date:	Wed, 22 Apr 2015 10:13:30 +0200
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:	Thomas Abraham <thomas.ab@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Mike Turquette <mturquette@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Kevin Hilman <khilman@...aro.org>,
	Heiko Stuebner <heiko@...ech.de>, linux-pm@...r.kernel.org,
	Tomasz Figa <tomasz.figa@...il.com>,
	linux-kernel@...r.kernel.org, Chanwoo Choi <cw00.choi@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 5/8] ARM: Exynos: use generic cpufreq driver for Exynos5420

Hi Bartlomiej,

> From: Thomas Abraham <thomas.ab@...sung.com>
> 
> The new CPU clock type allows the use of generic arm_big_little_dt
> cpufreq driver for Exynos5420.
> 
> Changes by Bartlomiej:
> - split Exynos5420 support from the original patch
> - disable cpufreq if big.LITTLE switcher support is enabled
> 
> Cc: Tomasz Figa <tomasz.figa@...il.com>
> Cc: Kukjin Kim <kgene.kim@...sung.com>
> Cc: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> Signed-off-by: Thomas Abraham <thomas.ab@...sung.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
>  arch/arm/mach-exynos/exynos.c |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/mach-exynos/exynos.c
> b/arch/arm/mach-exynos/exynos.c index 4b03a32..11ac7fb 100644
> --- a/arch/arm/mach-exynos/exynos.c
> +++ b/arch/arm/mach-exynos/exynos.c
> @@ -207,6 +207,13 @@ struct cpufreq_dt_platform_data cpufreq_dt_pd = {
>  static const struct of_device_id exynos_cpufreq_matches[] = {
>  	{ .compatible = "samsung,exynos4210", .data = "cpufreq-dt" },
>  	{ .compatible = "samsung,exynos5250", .data = "cpufreq-dt" },
> +/*
> + * FIXME: When big.LITTLE switcher is enabled system lockups during
> + * ondemand governor stress testing (observed on ODROID-XU3 board).
> + */
> +#ifndef CONFIG_BL_SWITCHER
> +	{ .compatible = "samsung,exynos5420", .data =
> "arm-bL-cpufreq-dt" }, +#endif
>  	{ /* sentinel */ }
>  };
>  

Reviewed-by: Lukasz Majewski <l.majewski@...sung.com>

-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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