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rtc: ds1343: use burst write to set time

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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>
This commit is contained in:
Alexandre Belloni 2019-10-19 22:49:35 +02:00
parent 8c9a88fae2
commit f308b68202
1 changed files with 10 additions and 38 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

48
drivers/rtc/rtc-ds1343.c
View file

@ -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;
u8 buf[7];
res = regmap_write(priv->map, DS1343_SECONDS_REG,
bin2bcd(dt->tm_sec));
if (res)
return res;
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);
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;
return regmap_bulk_write(priv->map, DS1343_SECONDS_REG,
buf, sizeof(buf));
}
static int ds1343_update_alarm(struct device *dev)