From: Jan Kardell Date: Thu, 28 May 2015 06:48:45 +0000 (+0200) Subject: rtc: pcf8563 fix: return -EINVAL if we read an invalid time. X-Git-Tag: firefly_0821_release~176^2~1560^2~20 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=538330ccb93849530f5617d1fa870237496caa60;p=firefly-linux-kernel-4.4.55.git rtc: pcf8563 fix: return -EINVAL if we read an invalid time. Return -EINVAL if the voltage low bit is set to avoid getting a bogus time at boot. There was a comment stating that util-linux hwclock refuses to set a new time if we return an error code on read, but at least the current version do set the time as expected. Remove the comment and the check for valid time, and let the rtc core check it for us. Signed-off-by: Jan Kardell Signed-off-by: Alexandre Belloni --- diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c index 0ba7e59929be..229426dee1ea 100644 --- a/drivers/rtc/rtc-pcf8563.c +++ b/drivers/rtc/rtc-pcf8563.c @@ -22,7 +22,7 @@ #include #include -#define DRV_VERSION "0.4.3" +#define DRV_VERSION "0.4.4" #define PCF8563_REG_ST1 0x00 /* status */ #define PCF8563_REG_ST2 0x01 @@ -202,8 +202,9 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) { pcf8563->voltage_low = 1; - dev_info(&client->dev, + dev_err(&client->dev, "low voltage detected, date/time is not reliable.\n"); + return -EINVAL; } dev_dbg(&client->dev, @@ -234,12 +235,6 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) tm->tm_sec, tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); - /* the clock can give out invalid datetime, but we cannot return - * -EINVAL otherwise hwclock will refuse to set the time on bootup. - */ - if (rtc_valid_tm(tm) < 0) - dev_err(&client->dev, "retrieved date/time is not valid.\n"); - return 0; }