From: Krzysztof Kozlowski <krzk@kernel.org>
Date: Mon, 15 Jun 2020 18:14:55 +0200
Subject: rtc: max77686: Do not allow interrupt to fire before system resume

Git-commit: d8f090dbeafdcc3d30761aa0062f19d1adf9ef08
Patch-mainline: v5.9-rc1
References: jsc#SLE-15847

The rtc-max77686 device shares the main interrupt line with parent MFD
device (max77686 driver).  During the system suspend, the parent MFD
device disables this IRQ to prevent an early event happening before
resuming I2C bus controller.

The same should be done by rtc-max77686 driver because otherwise the
interrupt handler max77686_rtc_alarm_irq() will be called before its
resume function (max77686_rtc_resume()).  Such issue is not fatal but
disabling shared IRQ by all users ensures correct behavior.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200615161455.4420-1-krzk@kernel.org
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/rtc/rtc-max77686.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
index 03ebcf1c0f3d..645de5af707b 100644
--- a/drivers/rtc/rtc-max77686.c
+++ b/drivers/rtc/rtc-max77686.c
@@ -805,17 +805,33 @@ static int max77686_rtc_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM_SLEEP
 static int max77686_rtc_suspend(struct device *dev)
 {
+	struct max77686_rtc_info *info = dev_get_drvdata(dev);
+	int ret = 0;
+
 	if (device_may_wakeup(dev)) {
 		struct max77686_rtc_info *info = dev_get_drvdata(dev);
 
-		return enable_irq_wake(info->virq);
+		ret = enable_irq_wake(info->virq);
 	}
 
-	return 0;
+	/*
+	 * Main IRQ (not virtual) must be disabled during suspend because if it
+	 * happens while suspended it will be handled before resuming I2C.
+	 *
+	 * Since Main IRQ is shared, all its users should disable it to be sure
+	 * it won't fire while one of them is still suspended.
+	 */
+	disable_irq(info->rtc_irq);
+
+	return ret;
 }
 
 static int max77686_rtc_resume(struct device *dev)
 {
+	struct max77686_rtc_info *info = dev_get_drvdata(dev);
+
+	enable_irq(info->rtc_irq);
+
 	if (device_may_wakeup(dev)) {
 		struct max77686_rtc_info *info = dev_get_drvdata(dev);
 
-- 
2.26.2