Merge tag 'v6.17.8' into linux-6.17.ylinux-6.17.y

This is the 6.17.8 stable release

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c
index f39102b66eac..3baa2b481d9f 100644
--- a/drivers/rtc/rtc-zynqmp.c
+++ b/drivers/rtc/rtc-zynqmp.c
@@ -277,6 +277,10 @@ static irqreturn_t xlnx_rtc_interrupt(int irq, void *id)
 static int xlnx_rtc_probe(struct platform_device *pdev)
 {
 	struct xlnx_rtc_dev *xrtcdev;
+	bool is_alarm_set = false;
+	u32 pending_alrm_irq;
+	u32 current_time;
+	u32 alarm_time;
 	int ret;
 
 	xrtcdev = devm_kzalloc(&pdev->dev, sizeof(*xrtcdev), GFP_KERNEL);
@@ -296,6 +300,17 @@ static int xlnx_rtc_probe(struct platform_device *pdev)
 	if (IS_ERR(xrtcdev->reg_base))
 		return PTR_ERR(xrtcdev->reg_base);
 
+	/* Clear any pending alarm interrupts from previous kernel/boot */
+	pending_alrm_irq = readl(xrtcdev->reg_base + RTC_INT_STS) & RTC_INT_ALRM;
+	if (pending_alrm_irq)
+		writel(pending_alrm_irq, xrtcdev->reg_base + RTC_INT_STS);
+
+	/* Check if a valid alarm is already set from previous kernel/boot */
+	alarm_time = readl(xrtcdev->reg_base + RTC_ALRM);
+	current_time = readl(xrtcdev->reg_base + RTC_CUR_TM);
+	if (alarm_time > current_time && alarm_time != 0)
+		is_alarm_set = true;
+
 	xrtcdev->alarm_irq = platform_get_irq_byname(pdev, "alarm");
 	if (xrtcdev->alarm_irq < 0)
 		return xrtcdev->alarm_irq;
@@ -337,6 +352,10 @@ static int xlnx_rtc_probe(struct platform_device *pdev)
 
 	xlnx_init_rtc(xrtcdev);
 
+	/* Re-enable alarm interrupt if a valid alarm was found */
+	if (is_alarm_set)
+		writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_EN);
+
 	device_init_wakeup(&pdev->dev, true);
 
 	return devm_rtc_register_device(xrtcdev->rtc);