From a1e98e09704ad247bff3c0de1bef6a73dc88b6d0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Beno=C3=AEt=20Th=C3=A9baudeau?= <benoit@wsystem.com> Date: Thu, 21 Jul 2016 12:41:29 +0200 Subject: [PATCH] rtc: rv8803: Fix read day of week MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The Weekday register is encoded as 2^tm_wday, with tm_wday in 0..6, so using tm_wday = ffs(reg) to fill tm_wday from the register value is wrong because this gives the expected value + 1. This could be fixed as tm_wday = ffs(reg) - 1, but tm_wday = ilog2(reg) works as well and is more direct. Signed-off-by: Benoît Thébaudeau <benoit@wsystem.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> --- drivers/rtc/rtc-rv8803.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c index e740c8351659..aa1d6b67a9ee 100644 --- a/drivers/rtc/rtc-rv8803.c +++ b/drivers/rtc/rtc-rv8803.c @@ -13,6 +13,7 @@ #include <linux/bcd.h> #include <linux/bitops.h> +#include <linux/log2.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/kernel.h> @@ -145,7 +146,7 @@ static int rv8803_get_time(struct device *dev, struct rtc_time *tm) tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f); tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f); tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f); - tm->tm_wday = ffs(date[RV8803_WEEK] & 0x7f); + tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f); tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f); tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1; tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100; -- GitLab