1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c
index 33c7c90412ba..928ac281f937 100644
--- a/drivers/clocksource/timer-stm32.c
+++ b/drivers/clocksource/timer-stm32.c
@@ -37,6 +37,9 @@
 
 #define TIM_EGR_UG      BIT(0)
 
+#define TIM_PSC_MAX     USHRT_MAX
+#define TIM_PSC_CLKRATE 10000
+
 static int stm32_clock_event_shutdown(struct clock_event_device *clkevt)
 {
         struct timer_of *to = to_timer_of(clkevt);
@@ -116,7 +119,14 @@ static void __init stm32_clockevent_init(struct timer_of *to)
                 prescaler = 1;
                 to->clkevt.rating = 250;
         } else {
-                prescaler = 1024;
+                prescaler = DIV_ROUND_CLOSEST(timer_of_rate(to),
+                                              TIM_PSC_CLKRATE);
+                /*
+                 * The prescaler register is an u16, the variable
+                 * can't be greater than TIM_PSC_MAX, let's cap it in
+                 * this case.
+                 */
+                prescaler = prescaler < TIM_PSC_MAX ? prescaler : TIM_PSC_MAX;
                 to->clkevt.rating = 100;
         }
         writel_relaxed(0, timer_of_base(to) + TIM_ARR);