Some platforms, like the Samsung Galaxy S8, leave CNTFRQ_EL0 unset in
the previous stage bootloader. Therefore reading it causes a hang and
the boot proccess is halted.
Since on such retail devices there is no way to set it without replacing
the entire boot chain, allow setting a value from clock-frequency
whenever it's passed.
Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivan...@gmail.com>
---
drivers/clocksource/arm_architected_timer.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/clocksource/arm_architected_timer.c
b/drivers/clocksource/arm_architected_timer.c
index 9a1f2d2b..daced94c 100644
--- a/drivers/clocksource/arm_architected_timer.c
+++ b/drivers/clocksource/arm_architected_timer.c
@@ -24,7 +24,16 @@ static struct clocksource cs = {
static int arm_arch_timer_probe(struct device *dev)
{
- cs.mult = clocksource_hz2mult(get_cntfrq(), cs.shift);
+ u32 cntfrq;
+ int ret;
+
+ /* Some platforms don't set CNTFRQ_EL0 before barebox */
+ ret = of_property_read_u32(dev->of_node, "clock-frequency", &cntfrq);
+
+ if (ret)
+ cntfrq = get_cntfrq();
+
+ cs.mult = clocksource_hz2mult(cntfrq, cs.shift);
return init_clock(&cs);
}
--
2.43.0
