linux-kernel - [PATCH 2/4] rtc: pxa: fix rtc caculation issue

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Date:	Wed, 28 Nov 2012 21:21:08 -0500
From:	Chao Xie <chao.xie@...vell.com>
To:	a.zummo@...ertech.it, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org, haojian.zhuang@...il.com,
	linux-arm-kernel@...ts.infradead.org, xiechao.mail@...il.com
Subject: [PATCH 2/4] rtc: pxa: fix rtc caculation issue

The original calculation does not take care of week-of-month and
day-of-week. It will make rdar/rdcr not matched when set the
alarm.

Signed-off-by: Chao Xie <chao.xie@...vell.com>
---
 drivers/rtc/rtc-pxa.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/drivers/rtc/rtc-pxa.c b/drivers/rtc/rtc-pxa.c
index f771b2e..22ea4f5 100644
--- a/drivers/rtc/rtc-pxa.c
+++ b/drivers/rtc/rtc-pxa.c
@@ -62,6 +62,10 @@
 #define RYxR_MONTH_S	5
 #define RYxR_MONTH_MASK	(0xf << RYxR_MONTH_S)
 #define RYxR_DAY_MASK	0x1f
+#define RDxR_WOM_S	20
+#define RDxR_WOM_MASK	(0x7 << RDxR_WOM_S)
+#define RDxR_DOW_S	17
+#define RDxR_DOW_MASK	(0x7 << RDxR_DOW_S)
 #define RDxR_HOUR_S	12
 #define RDxR_HOUR_MASK	(0x1f << RDxR_HOUR_S)
 #define RDxR_MIN_S	6
@@ -100,7 +104,10 @@ static u32 ryxr_calc(struct rtc_time *tm)
 
 static u32 rdxr_calc(struct rtc_time *tm)
 {
-	return (tm->tm_hour << RDxR_HOUR_S) | (tm->tm_min << RDxR_MIN_S)
+	return ((((tm->tm_mday + 6) / 7) << RDxR_WOM_S) & RDxR_WOM_MASK)
+		| (((tm->tm_wday + 1) << RDxR_DOW_S) & RDxR_DOW_MASK)
+		| (tm->tm_hour << RDxR_HOUR_S)
+		| (tm->tm_min << RDxR_MIN_S)
 		| tm->tm_sec;
 }
 
@@ -109,6 +116,7 @@ static void tm_calc(u32 rycr, u32 rdcr, struct rtc_time *tm)
 	tm->tm_year = ((rycr & RYxR_YEAR_MASK) >> RYxR_YEAR_S) - 1900;
 	tm->tm_mon = (((rycr & RYxR_MONTH_MASK) >> RYxR_MONTH_S)) - 1;
 	tm->tm_mday = (rycr & RYxR_DAY_MASK);
+	tm->tm_wday = ((rdcr & RDxR_DOW_MASK) >> RDxR_DOW_S) - 1;
 	tm->tm_hour = (rdcr & RDxR_HOUR_MASK) >> RDxR_HOUR_S;
 	tm->tm_min = (rdcr & RDxR_MIN_MASK) >> RDxR_MIN_S;
 	tm->tm_sec = rdcr & RDxR_SEC_MASK;
-- 
1.7.4.1

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