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authorAlexandre Belloni <alexandre.belloni@bootlin.com>2019-10-19 23:49:35 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2019-10-19 23:56:00 +0300
commitf308b682028a34874a376da649f99e7531dea15c (patch)
treea24eda7d4ec0e0c38466468676e830e7b30defb6 /drivers/rtc/rtc-ds1343.c
parent8c9a88fae2ce50f1aef5a72273a5d46e4fa89603 (diff)
downloadlinux-f308b682028a34874a376da649f99e7531dea15c.tar.xz
rtc: ds1343: use burst write to set time
To avoid possible race condition, use regmap_bulk_write to write all the date/time registers at once instead of sequentially. Link: https://lore.kernel.org/r/20191019204941.6203-3-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/rtc-ds1343.c')
-rw-r--r--drivers/rtc/rtc-ds1343.c52
1 files changed, 12 insertions, 40 deletions
diff --git a/drivers/rtc/rtc-ds1343.c b/drivers/rtc/rtc-ds1343.c
index 9d7d571e722b..8a4f1fbb57fd 100644
--- a/drivers/rtc/rtc-ds1343.c
+++ b/drivers/rtc/rtc-ds1343.c
@@ -236,46 +236,18 @@ static int ds1343_read_time(struct device *dev, struct rtc_time *dt)
static int ds1343_set_time(struct device *dev, struct rtc_time *dt)
{
struct ds1343_priv *priv = dev_get_drvdata(dev);
- int res;
-
- res = regmap_write(priv->map, DS1343_SECONDS_REG,
- bin2bcd(dt->tm_sec));
- if (res)
- return res;
-
- res = regmap_write(priv->map, DS1343_MINUTES_REG,
- bin2bcd(dt->tm_min));
- if (res)
- return res;
-
- res = regmap_write(priv->map, DS1343_HOURS_REG,
- bin2bcd(dt->tm_hour) & 0x3F);
- if (res)
- return res;
-
- res = regmap_write(priv->map, DS1343_DAY_REG,
- bin2bcd(dt->tm_wday + 1));
- if (res)
- return res;
-
- res = regmap_write(priv->map, DS1343_DATE_REG,
- bin2bcd(dt->tm_mday));
- if (res)
- return res;
-
- res = regmap_write(priv->map, DS1343_MONTH_REG,
- bin2bcd(dt->tm_mon + 1));
- if (res)
- return res;
-
- dt->tm_year %= 100;
-
- res = regmap_write(priv->map, DS1343_YEAR_REG,
- bin2bcd(dt->tm_year));
- if (res)
- return res;
-
- return 0;
+ u8 buf[7];
+
+ buf[0] = bin2bcd(dt->tm_sec);
+ buf[1] = bin2bcd(dt->tm_min);
+ buf[2] = bin2bcd(dt->tm_hour) & 0x3F;
+ buf[3] = bin2bcd(dt->tm_wday + 1);
+ buf[4] = bin2bcd(dt->tm_mday);
+ buf[5] = bin2bcd(dt->tm_mon + 1);
+ buf[6] = bin2bcd(dt->tm_year - 100);
+
+ return regmap_bulk_write(priv->map, DS1343_SECONDS_REG,
+ buf, sizeof(buf));
}
static int ds1343_update_alarm(struct device *dev)