[PATCH v3 07/13] ARM: tegra: Add tegra_pm_park_secondary_cpu()

Dmitry Osipenko
2019-07-15T17:30:08Z

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.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
arch/arm/mach-tegra/pm.c | 14 ++++++++++++++
include/soc/tegra/pm.h | 6 ++++++
2 files changed, 20 insertions(+)

diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index 4cc64a135a3e..7d9ef26e52a7 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -427,4 +427,18 @@ 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/include/soc/tegra/pm.h b/include/soc/tegra/pm.h
index 2fbee9efda21..08477d7bfab9 100644
--- a/include/soc/tegra/pm.h
+++ b/include/soc/tegra/pm.h
@@ -27,6 +27,7 @@ int tegra30_pm_secondary_cpu_suspend(unsigned long arg);
void tegra_pm_clear_cpu_in_lp2(void);
void tegra_pm_set_cpu_in_lp2(void);
int tegra_pm_enter_lp2(void);
+int tegra_pm_park_secondary_cpu(unsigned long cpu);
#else
static inline enum tegra_suspend_mode
tegra_pm_validate_suspend_mode(enum tegra_suspend_mode mode)
@@ -55,6 +56,11 @@ static inline int tegra_pm_enter_lp2(void)
{
return -ENOTSUPP;
}
+
+static inline int tegra_pm_park_secondary_cpu(unsigned long cpu)
+{
+ return -ENOTSUPP;
+}
#endif /* CONFIG_PM_SLEEP */

#endif /* __SOC_TEGRA_PM_H__ */
--
2.22.0