linux-kernel - [PATCH] rtc-pm8xxx: Clear Alarm register on resume

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Message-Id: <1584947769-12076-1-git-send-email-maggarwa@codeaurora.org>
Date:   Mon, 23 Mar 2020 12:46:09 +0530
From:   Mohit Aggarwal <maggarwa@...eaurora.org>
To:     a.zummo@...ertech.it, alexandre.belloni@...tlin.com
Cc:     Mohit Aggarwal <maggarwa@...eaurora.org>,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rtc-pm8xxx: Clear Alarm register on resume

Currently, alarm register is not cleared on resume
leading to reboot during power off charging mode.

Signed-off-by: Mohit Aggarwal <maggarwa@...eaurora.org>
---
 drivers/rtc/rtc-pm8xxx.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index bbe013f..f0d89a4 100644
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -301,6 +301,7 @@ static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
 	struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
 	const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
 	unsigned int ctrl_reg;
+	u8 value[NUM_8_BIT_RTC_REGS] = {0};
 
 	spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
 
@@ -319,6 +320,16 @@ static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
 		goto rtc_rw_fail;
 	}
 
+	/* Clear Alarm register */
+	if (!enable) {
+		     rc = regmap_bulk_write(rtc_dd->regmap, regs->alarm_rw, value,
+					sizeof(value));
+		     if (rc) {
+			     dev_err(dev, "Write to RTC ALARM register failed\n");
+			     goto rtc_rw_fail;
+		     }
+	}
+
 rtc_rw_fail:
 	spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
 	return rc;
-- 
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