[coreboot] [commit] r5780 - trunk/src/cpu/x86/tsc

[repository service]

Author: oxygene
Date: Tue Sep  7 09:53:26 2010
New Revision: 5780
URL: https://tracker.coreboot.org/trac/coreboot/changeset/5780

Log:
2ms is enough time to accurately obtain the clock rate.

Signed-off-by: Kevin O'Connor 
Acked-by: Patrick Georgi

Modified:
   trunk/src/cpu/x86/tsc/delay_tsc.c

Modified: trunk/src/cpu/x86/tsc/delay_tsc.c
==============================================================================
--- trunk/src/cpu/x86/tsc/delay_tsc.c	Tue Sep  7 09:43:10 2010	(r5779)
+++ trunk/src/cpu/x86/tsc/delay_tsc.c	Tue Sep  7 09:53:26 2010	(r5780)
@@ -18,8 +18,8 @@
  * device.
  */

-#define CALIBRATE_INTERVAL ((20*CLOCK_TICK_RATE)/1000) /* 20ms */
-#define CALIBRATE_DIVISOR  (20*1000) /* 20ms / 20000 == 1usec */
+#define CALIBRATE_INTERVAL ((2*CLOCK_TICK_RATE)/1000) /* 2ms */
+#define CALIBRATE_DIVISOR  (2*1000) /* 2ms / 2000 == 1usec */

static unsigned long long calibrate_tsc(void)
 {