Register the persistent clock to compensate the suspend time for OS time, if the ARM counter clocksource will not be stopped in suspend state.
Signed-off-by: Baolin Wang <[email protected]> --- drivers/clocksource/Kconfig | 1 + drivers/clocksource/arm_arch_timer.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 7f11c6c..5e51fcf 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -308,6 +308,7 @@ config ARC_TIMERS_64BIT config ARM_ARCH_TIMER bool + select PERSISTENT_CLOCK select TIMER_OF if OF select TIMER_ACPI if ACPI diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 57cb2f0..671be63 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -32,6 +32,7 @@ #include <asm/virt.h> #include <clocksource/arm_arch_timer.h> +#include <linux/persistent_clock.h> #undef pr_fmt #define pr_fmt(fmt) "arch_timer: " fmt @@ -950,6 +951,15 @@ static void __init arch_counter_register(unsigned type) /* 56 bits minimum, so we assume worst case rollover */ sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate); + + /* + * Register the persistent clock if the clocksource will not be stopped + * in suspend state. + */ + if (!arch_counter_suspend_stop) + persistent_clock_init_and_register(arch_timer_read_counter, + CLOCKSOURCE_MASK(56), + arch_timer_rate, 0); } static void arch_timer_stop(struct clock_event_device *clk) -- 1.7.9.5
