[MIPS] VSMP: Synchronize cp0 counters on bootup.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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 659706705005..d817c60c5ca5 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);