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.szyprow...@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
--
2.17.1
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