diff options
Diffstat (limited to 'arch/x86_64/kernel/hpet.c')
-rw-r--r-- | arch/x86_64/kernel/hpet.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86_64/kernel/hpet.c b/arch/x86_64/kernel/hpet.c index 8cf0b8a13778..b8286968662d 100644 --- a/arch/x86_64/kernel/hpet.c +++ b/arch/x86_64/kernel/hpet.c | |||
@@ -191,6 +191,7 @@ int hpet_reenable(void) | |||
191 | 191 | ||
192 | #define TICK_COUNT 100000000 | 192 | #define TICK_COUNT 100000000 |
193 | #define TICK_MIN 5000 | 193 | #define TICK_MIN 5000 |
194 | #define MAX_TRIES 5 | ||
194 | 195 | ||
195 | /* | 196 | /* |
196 | * Some platforms take periodic SMI interrupts with 5ms duration. Make sure none | 197 | * Some platforms take periodic SMI interrupts with 5ms duration. Make sure none |
@@ -198,13 +199,15 @@ int hpet_reenable(void) | |||
198 | */ | 199 | */ |
199 | static void __init read_hpet_tsc(int *hpet, int *tsc) | 200 | static void __init read_hpet_tsc(int *hpet, int *tsc) |
200 | { | 201 | { |
201 | int tsc1, tsc2, hpet1; | 202 | int tsc1, tsc2, hpet1, i; |
202 | 203 | ||
203 | do { | 204 | for (i = 0; i < MAX_TRIES; i++) { |
204 | tsc1 = get_cycles_sync(); | 205 | tsc1 = get_cycles_sync(); |
205 | hpet1 = hpet_readl(HPET_COUNTER); | 206 | hpet1 = hpet_readl(HPET_COUNTER); |
206 | tsc2 = get_cycles_sync(); | 207 | tsc2 = get_cycles_sync(); |
207 | } while (tsc2 - tsc1 > TICK_MIN); | 208 | if (tsc2 - tsc1 > TICK_MIN) |
209 | break; | ||
210 | } | ||
208 | *hpet = hpet1; | 211 | *hpet = hpet1; |
209 | *tsc = tsc2; | 212 | *tsc = tsc2; |
210 | } | 213 | } |