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-rw-r--r--arch/mips/kernel/cevt-r4k.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c
index 7274fd2513f..a59f67ff301 100644
--- a/arch/mips/kernel/cevt-r4k.c
+++ b/arch/mips/kernel/cevt-r4k.c
@@ -179,7 +179,7 @@ static int c0_compare_int_pending(void)
static int c0_compare_int_usable(void)
{
- const unsigned int delta = 0x300000;
+ unsigned int delta;
unsigned int cnt;
/*
@@ -192,9 +192,15 @@ static int c0_compare_int_usable(void)
return 0;
}
- cnt = read_c0_count();
- cnt += delta;
- write_c0_compare(cnt);
+ for (delta = 0x10; delta <= 0x400000; delta <<= 1) {
+ cnt = read_c0_count();
+ cnt += delta;
+ write_c0_compare(cnt);
+ irq_disable_hazard();
+ if ((int)(read_c0_count() - cnt) < 0)
+ break;
+ /* increase delta if the timer was already expired */
+ }
while ((int)(read_c0_count() - cnt) <= 0)
; /* Wait for expiry */