linux-kernel - Re: [PATCH 4/4] mcpm: exynos: populate suspend and powered

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Date:	Tue, 22 Apr 2014 12:51:06 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Chander Kashyap <chander.kashyap@...aro.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
CC:	lorenzo.pieralisi@....com, rjw@...ysocki.net,
	kgene.kim@...sung.com, Chander Kashyap <k.chander@...sung.com>
Subject: Re: [PATCH 4/4] mcpm: exynos: populate suspend and powered_up callbacks

On 04/21/2014 01:49 PM, Chander Kashyap wrote:
> In order to support cpuidle through mcpm, suspend and powered-up
> callbacks are required in mcpm platform code.
> Hence populate the same callbacks.
>
> Signed-off-by: Chander Kashyap <chander.kashyap@...aro.org>
> Signed-off-by: Chander Kashyap <k.chander@...sung.com>
> ---
>   arch/arm/mach-exynos/mcpm-exynos.c |   53 ++++++++++++++++++++++++++++++++++++
>   1 file changed, 53 insertions(+)
>
> diff --git a/arch/arm/mach-exynos/mcpm-exynos.c b/arch/arm/mach-exynos/mcpm-exynos.c
> index 46d4968..16af0bd 100644
> --- a/arch/arm/mach-exynos/mcpm-exynos.c
> +++ b/arch/arm/mach-exynos/mcpm-exynos.c
> @@ -318,10 +318,63 @@ static int exynos_power_down_finish(unsigned int cpu, unsigned int cluster)
>   	return 0; /* success: the CPU is halted */
>   }
>
> +static void enable_coherency(void)
> +{
> +	unsigned long v, u;
> +
> +	asm volatile(
> +		"mrc	p15, 0, %0, c1, c0, 1\n"
> +		"orr	%0, %0, %2\n"
> +		"ldr	%1, [%3]\n"
> +		"and	%1, %1, #0\n"
> +		"orr	%0, %0, %1\n"
> +		"mcr	p15, 0, %0, c1, c0, 1\n"
> +		: "=&r" (v), "=&r" (u)
> +		: "Ir" (0x40), "Ir" (S5P_INFORM0)
> +		: "cc");
> +}

Shouldn't this function to be used from hotplug.c also ?

> +
> +void exynos_powered_up(void)
> +{
> +	unsigned int mpidr, cpu, cluster;
> +
> +	mpidr = read_cpuid_mpidr();
> +	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
> +	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
> +
> +	arch_spin_lock(&bl_lock);
> +	if (cpu_use_count[cpu][cluster] == 0)
> +		cpu_use_count[cpu][cluster] = 1;
> +	arch_spin_unlock(&bl_lock);
> +}
> +
> +static void exynos_suspend(u64 residency)
> +{
> +	unsigned int mpidr, cpunr;
> +
> +	mpidr = read_cpuid_mpidr();
> +	cpunr = enynos_pmu_cpunr(mpidr);

*enynos*_pmu_cpunr ?

> +
> +	__raw_writel(virt_to_phys(mcpm_entry_point), REG_ENTRY_ADDR);
> +
> +	exynos_power_down();
> +
> +	/*
> +	 * Execution reaches here only if cpu did not power down.
> +	 * Hence roll back the changes done in exynos_power_down function.
> +	*/
> +	__raw_writel(EXYNOS_CORE_LOCAL_PWR_EN,
> +			EXYNOS_ARM_CORE_CONFIGURATION(cpunr));

Why don't you use the functions defined in the

patch 5/5 arm: exynos: Add MCPM call-back functions

exynos_core_power_control() ?

> +	set_cr(get_cr() | CR_C);
> +	enable_coherency();
> +}
> +
>   static const struct mcpm_platform_ops exynos_power_ops = {
>   	.power_up		= exynos_power_up,
>   	.power_down		= exynos_power_down,
>   	.power_down_finish	= exynos_power_down_finish,
> +	.suspend		= exynos_suspend,
> +	.powered_up		= exynos_powered_up,
>   };
>
>   static void __init exynos_mcpm_usage_count_init(void)
>


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