[PATCH] RTC: Remove RTC UIP synchronization on ARM

Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 16 deletions

diff --git a/arch/arm/mach-footbridge/time.c b/arch/arm/mach-footbridge/time.c
index 2c64a0b0502e..5d02e95dede3 100644
--- a/arch/arm/mach-footbridge/time.c
+++ b/arch/arm/mach-footbridge/time.c
@@ -34,27 +34,12 @@ static int rtc_base;
 static unsigned long __init get_isa_cmos_time(void)
 {
 	unsigned int year, mon, day, hour, min, sec;
-	int i;
 
 	// check to see if the RTC makes sense.....
 	if ((CMOS_READ(RTC_VALID) & RTC_VRT) == 0)
 		return mktime(1970, 1, 1, 0, 0, 0);
 
-	/* The Linux interpretation of the CMOS clock register contents:
-	 * When the Update-In-Progress (UIP) flag goes from 1 to 0, the
-	 * RTC registers show the second which has precisely just started.
-	 * Let's hope other operating systems interpret the RTC the same way.
-	 */
-	/* read RTC exactly on falling edge of update flag */
-	for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */
-		if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
-			break;
-
-	for (i = 0 ; i < 1000000 ; i++) /* must try at least 2.228 ms */
-		if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
-			break;
-
-	do { /* Isn't this overkill ? UIP above should guarantee consistency */
+	do {
 		sec  = CMOS_READ(RTC_SECONDS);
 		min  = CMOS_READ(RTC_MINUTES);
 		hour = CMOS_READ(RTC_HOURS);