ARM: shmobile: use signals from SYSC to wake up from Suspend-to-RAM
RFC PATCH v2 2/7 ARM: shmobile: use signals from SYSC to wake up from Suspend-to-RAM
Disable GIC CPU IF so system will only resume by permitted wakeup signals via System Controller IP.
It improves low-power implementation and prepares for cluster powerdown in future.
Signed-off-by Shinya Kuribayashi <[email protected]>
Signed-off-by Khiem Nguyen <[email protected]>
--- arch/arm/mach-shmobile/platsmp-apmu.c | 8 ++++++++ 1 file changed, 8 insertions(+)
arch/arm/mach-shmobile/platsmp-apmu.c +8 -0
@@ -13,6 +13,7 @@#include <linux/init.h> #include <linux/io.h> #include <linux/ioport.h> +#include <linux/irqchip/arm-gic.h> #include <linux/of_address.h> #include <linux/smp.h> #include <linux/suspend.h>
@@ -214,6 +215,13 @@ static int shmobile_smp_apmu_do_suspend(unsigned long cpu)#if defined(CONFIG_SUSPEND )static int shmobile_smp_apmu_enter_suspend (suspend_state_t state) { +/* +* Disable the CPU interface when a CPU core is entering L2 +* shutdown mode, that will help us to prevent spurious CPU +* wakeup to happen upon WFI execution. +*/ +gic_cpu_if_down (); +shmobile_smp_hook (smp_processor_id (),virt_to_phys (cpu_resume),0 );cpu_suspend (smp_processor_id (), shmobile_smp_apmu_do_suspend);cpu_leave_lowpower ();
Signature · 1 line
1.7.9.5