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authorRalf Baechle <ralf@linux-mips.org>2006-10-31 18:33:09 +0000
committerRalf Baechle <ralf@linux-mips.org>2006-10-31 20:13:22 +0000
commit70e46f48cb5933119712ee27945309a4bfc98282 (patch)
treec9a35ca3652659562e8bc534ca2caf563d9ccd88 /arch/mips/mips-boards
parente79f55a8c7aaae5a33e8c2b29682ec8e603b5434 (diff)
[MIPS] VSMP: Synchronize cp0 counters on bootup.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mips-boards')
-rw-r--r--arch/mips/mips-boards/generic/time.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/mips/mips-boards/generic/time.c b/arch/mips/mips-boards/generic/time.c
index 65970670500..d817c60c5ca 100644
--- a/arch/mips/mips-boards/generic/time.c
+++ b/arch/mips/mips-boards/generic/time.c
@@ -209,6 +209,7 @@ static unsigned int __init estimate_cpu_frequency(void)
#endif
#if defined(CONFIG_MIPS_ATLAS) || defined(CONFIG_MIPS_MALTA)
unsigned long flags;
+ unsigned int start;
local_irq_save(flags);
@@ -217,13 +218,13 @@ static unsigned int __init estimate_cpu_frequency(void)
while (!(CMOS_READ(RTC_REG_A) & RTC_UIP));
/* Start r4k counter. */
- write_c0_count(0);
+ start = read_c0_count();
/* Read counter exactly on falling edge of update flag */
while (CMOS_READ(RTC_REG_A) & RTC_UIP);
while (!(CMOS_READ(RTC_REG_A) & RTC_UIP));
- count = read_c0_count();
+ count = read_c0_count() - start;
/* restore interrupts */
local_irq_restore(flags);