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@xxxxxxxxxx>
Tested-by: Peter Geis <pgwipeout@xxxxxxxxx>
Tested-by: Jasper Korten <jja2000@xxxxxxxxx>
Tested-by: David Heidelberg <david@xxxxxxx>
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
arch/arm/mach-tegra/pm.c | 14 ++++++++++++++
arch/arm/mach-tegra/pm.h | 5 +++++
2 files changed, 19 insertions(+)
diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index 3cab81b82866..f5ff3dd1dd81 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -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
diff --git a/arch/arm/mach-tegra/pm.h b/arch/arm/mach-tegra/pm.h
index 569151b3edc0..9a790f00237f 100644
--- a/arch/arm/mach-tegra/pm.h
+++ b/arch/arm/mach-tegra/pm.h
@@ -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_ */
--
2.24.0
