ARM: tegra: Add tegra_pm_park_secondary_cpu() (859a6f6e) · Commits · 戴 / test

This function resembles tegra_cpu_die() of the hotplug code, but this variant is more suitable to be used for CPU PM because it's made specifically to be used by cpu_suspend(). In short this function puts secondary CPU offline, it will be used by the new CPUIDLE driver. Acked-by:

Peter De Schrijver <pdeschrijver@nvidia.com> Tested-by:

Peter Geis <pgwipeout@gmail.com> Tested-by:

Jasper Korten <jja2000@gmail.com> Tested-by:

David Heidelberg <david@ixit.cz> Tested-by:

Nicolas Chauvet <kwizart@gmail.com> Signed-off-by:

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

Thierry Reding <treding@nvidia.com>

arch/arm/mach-tegra/pm.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -436,4 +436,18 @@ void __init tegra_init_suspend(void)

		suspend_set_ops(&tegra_suspend_ops);
		}

		int tegra_pm_park_secondary_cpu(unsigned long cpu)
		{
		if (cpu > 0) {
		tegra_disable_clean_inv_dcache(TEGRA_FLUSH_CACHE_LOUIS);

		if (tegra_get_chip_id() == TEGRA20)
		tegra20_hotplug_shutdown();
		else
		tegra30_hotplug_shutdown();
		}

		return -EINVAL;
		}
		#endif

arch/arm/mach-tegra/pm.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -31,8 +31,13 @@ extern void (*tegra_tear_down_cpu)(void);

		#ifdef CONFIG_PM_SLEEP
		void tegra_init_suspend(void);
		int tegra_pm_park_secondary_cpu(unsigned long cpu);
		#else
		static inline void tegra_init_suspend(void) {}
		static inline int tegra_pm_park_secondary_cpu(unsigned long cpu)
		{
		return -ENOTSUPP;
		}
		#endif

		#endif /* _MACH_TEGRA_PM_H_ */

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