Some boards use legacy firmware which doesn't properly configure ARM architected timer registers. This patch adds a workaround to use the defined COUNTER_FREQUENCY instead of reading its value from the timer registers.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- arch/arm/cpu/armv8/generic_timer.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm/cpu/armv8/generic_timer.c b/arch/arm/cpu/armv8/generic_timer.c index c1706dcec1..5ac62a0a32 100644 --- a/arch/arm/cpu/armv8/generic_timer.c +++ b/arch/arm/cpu/armv8/generic_timer.c @@ -15,9 +15,13 @@ DECLARE_GLOBAL_DATA_PTR; */ unsigned long get_tbclk(void) { +#ifndef COUNTER_FREQUENCY unsigned long cntfrq; asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq)); return cntfrq; +#else + return COUNTER_FREQUENCY; +#endif }
#ifdef CONFIG_SYS_FSL_ERRATUM_A008585