From: Matt Mackall Date: Tue, 28 Mar 2006 09:56:05 +0000 (-0800) Subject: [PATCH] RTC: Remove RTC UIP synchronization on ARM X-Git-Tag: v2.6.17-rc1~267 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=4af6ec46c696a57ba9b1c1abffcdca14d6ab5410;p=linux-2.6-omap-h63xx.git [PATCH] RTC: Remove RTC UIP synchronization on ARM Signed-off-by: Matt Mackall Cc: Russell King Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/arm/mach-footbridge/time.c b/arch/arm/mach-footbridge/time.c index 2c64a0b0502..5d02e95dede 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);