From: Matt Mackall Date: Tue, 28 Mar 2006 09:56:08 +0000 (-0800) Subject: [PATCH] RTC: Remove RTC UIP synchronization on SH MPC1211 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=356a9ce118879664ff88b76055b8bba115c1cc5e;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [PATCH] RTC: Remove RTC UIP synchronization on SH MPC1211 Signed-off-by: Matt Mackall Cc: Paul Mundt Cc: Kazumoto Kojima Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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);