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

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Date:   Mon, 16 Mar 2020 12:41:28 +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.

Change-Id: Ie2e6bbab8aa46e4e9b9cc984181ffab557cbbdae
Signed-off-by: Mohit Aggarwal <maggarwa@...eaurora.org>
---
 drivers/rtc/rtc-pm8xxx.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index bbe013f..96e7985 100644
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2010-2011, 2019, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2010-2011, 2019-2020, The Linux Foundation. All rights reserved. */
 
 #include <linux/of.h>
 #include <linux/module.h>
@@ -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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