Fix timer code for ARM systems: make sure that udelay() does not
reset timers so it's save to use udelay() in timeout code.
diff --git a/cpu/arm920t/imx/interrupts.c b/cpu/arm920t/imx/interrupts.c
index 12ae2fa..2f2e754 100644
--- a/cpu/arm920t/imx/interrupts.c
+++ b/cpu/arm920t/imx/interrupts.c
@@ -81,10 +81,13 @@
void udelay_masked (unsigned long usec)
{
- ulong start = get_timer_masked();
+ ulong endtime = get_timer_masked() + usec;
+ signed long diff;
- while (get_timer_masked () - start < usec )
- /*NOP*/;
+ do {
+ ulong now = get_timer_masked ();
+ diff = endtime - now;
+ } while (diff >= 0);
}
void udelay (unsigned long usec)
