rtc: rv8803: Clear V1F when setting the time

bthebaudeau · alexandrebelloni · commit 6f367788d633 · 2016-07-28T09:59:43.000+02:00
V1F indicates that the time accuracy may have been compromised because
of a voltage drop (possibly only temporary) below VLOW1, which stops the
temperature compensation. When the time is set, the accuracy is
restored, so V1F should be cleared in order to indicate this and to be
able to detect the next temperature compensation loss. This is the same
principle as for V2F, which is cleared when the time is set to indicate
that the time is no longer invalid and to be able to detect the next
data loss.

Signed-off-by: Benoît Thébaudeau &lt;benoit@wsystem.com&gt;
Signed-off-by: Alexandre Belloni &lt;alexandre.belloni@free-electrons.com&gt;
diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
@@ -265,7 +265,7 @@ static int rv8803_set_time(struct device *dev, struct rtc_time *tm)
 	}
 
 	ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
-			       flags & ~RV8803_FLAG_V2F);
+			       flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F));
 
 	mutex_unlock(&rv8803->flags_lock);
 

Original file line number	Diff line number	Diff line change
`@@ -265,7 +265,7 @@ static int rv8803_set_time(struct device dev, struct rtc_time tm)`
`265`	`265`	`}`
`266`	`266`
`267`	`267`	`ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,`
`268`		`- flags & ~RV8803_FLAG_V2F);`
	`268`	`+ flags & ~(RV8803_FLAG_V1F \| RV8803_FLAG_V2F));`
`269`	`269`
`270`	`270`	`mutex_unlock(&rv8803->flags_lock);`
`271`	`271`