[PATCH] RTC: Remove RTC UIP synchronization on SH MPC1211

Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
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, 3 insertions, 15 deletions

diff --git a/arch/sh/boards/mpc1211/rtc.c b/arch/sh/boards/mpc1211/rtc.c
index 4d100f048072..76aab46e59a0 100644
--- a/arch/sh/boards/mpc1211/rtc.c
+++ b/arch/sh/boards/mpc1211/rtc.c
@@ -19,26 +19,13 @@
 #define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
 #endif
 
-/* arc/i386/kernel/time.c */
 unsigned long get_cmos_time(void)
 {
         unsigned int year, mon, day, hour, min, sec;
-        int i;
 
         spin_lock(&rtc_lock);
-        /* 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);
@@ -46,6 +33,7 @@ unsigned long get_cmos_time(void)
                 mon = CMOS_READ(RTC_MONTH);
                 year = CMOS_READ(RTC_YEAR);
         } while (sec != CMOS_READ(RTC_SECONDS));
+
         if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
           {
             BCD_TO_BIN(sec);