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ARM: tegra: Add tegra_pm_park_secondary_cpu()

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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>
This commit is contained in:
Dmitry Osipenko 2020-02-25 01:40:42 +03:00 committed by Thierry Reding
parent df25e55488
commit 859a6f6ee1
2 changed files with 19 additions and 0 deletions
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14
arch/arm/mach-tegra/pm.c
View file

@ -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

5
arch/arm/mach-tegra/pm.h
View file

@ -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_ */