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/lh7a40x/interrupts.c b/cpu/lh7a40x/interrupts.c
index 3c2dc4f..23d8039 100644
--- a/cpu/lh7a40x/interrupts.c
+++ b/cpu/lh7a40x/interrupts.c
@@ -281,25 +281,29 @@
void udelay_masked (unsigned long usec)
{
ulong tmo;
+ ulong endtime;
+ signed long diff;
/* normalize */
if (usec >= 1000) {
tmo = usec / 1000;
tmo *= CFG_HZ;
tmo /= 1000;
- }
- else {
+ } else {
if (usec > 1) {
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
- }
- else
+ } else {
tmo = 1;
+ }
}
- reset_timer_masked ();
+ endtime = get_timer_masked () + tmo;
- while (get_timer_masked () < tmo);
+ do {
+ ulong now = get_timer_masked ();
+ diff = endtime - now;
+ } while (diff >= 0);
}
/*