[4.19,043/243] rtc: s3c-rtc: Avoid using broken ALMYEAR register

Message ID 20191211150342.039887686@linuxfoundation.org
State Superseded
Headers show
Series
  • Untitled series #25616
Related show

Commit Message

Greg KH Dec. 11, 2019, 3:03 p.m.
From: Marek Szyprowski <m.szyprowski@samsung.com>


[ Upstream commit 50c8aec4212a966817e868056efc9bfbb73337c0 ]

(RTC,ALM)YEAR registers of Exynos built-in RTC device contains 3 BCD
characters. s3c-rtc driver uses only 2 lower of them and supports years
from 2000..2099 range. The third BCD value is typically set to 0, but it
looks that handling of it is broken in the hardware. It sometimes
defaults to a random (even non-BCD) value. This is not an issue
for handling RTCYEAR register, because bcd2bin() properly handles only
8bit values (2 BCD characters, the third one is skipped). The problem
is however with ALMYEAR register and proper RTC alarm operation. When
YEAREN bit is set for the configured alarm, RTC hardware triggers alarm
only when ALMYEAR and RTCYEAR matches. This usually doesn't happen
because of the random noise on the third BCD character.

Fix this by simply skipping setting ALMYEAR register in alarm
configuration. This workaround fixes broken alarm operation on Exynos
built-in rtc device. My tests revealed that the issue happens on the
following Exynos series: 3250, 4210, 4412, 5250 and 5410.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Signed-off-by: Sasha Levin <sashal@kernel.org>

---
 drivers/rtc/rtc-s3c.c | 6 ------
 1 file changed, 6 deletions(-)

-- 
2.20.1

Patch

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 75c8c5033e087..58e03ac3578b7 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -327,7 +327,6 @@  static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 	struct rtc_time *tm = &alrm->time;
 	unsigned int alrm_en;
 	int ret;
-	int year = tm->tm_year - 100;
 
 	dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 		alrm->enabled,
@@ -356,11 +355,6 @@  static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 		writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
 	}
 
-	if (year < 100 && year >= 0) {
-		alrm_en |= S3C2410_RTCALM_YEAREN;
-		writeb(bin2bcd(year), info->base + S3C2410_ALMYEAR);
-	}
-
 	if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
 		alrm_en |= S3C2410_RTCALM_MONEN;
 		writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);