diff mbox series

rtc: brcmstb-waketimer: support level alarm_irq

Message ID 20230830224747.1663044-1-opendmb@gmail.com
State Accepted
Headers show
Series rtc: brcmstb-waketimer: support level alarm_irq | expand

Commit Message

Doug Berger Aug. 30, 2023, 10:47 p.m. UTC
Some devices (e.g. BCM72112) use an alarm_irq interrupt that is
connected to a level interrupt controller rather than an edge
interrupt controller. In this case, the interrupt cannot be left
enabled by the irq handler while preserving the hardware wake-up
signal on wake capable devices or an interrupt storm will occur.

The alarm_expired flag is introduced to allow the disabling of
the interrupt when an alarm expires and to support balancing the
calls to disable_irq() and enable_irq() in accordance with the
existing design.

Fixes: 24304a87158a ("rtc: brcmstb-waketimer: allow use as non-wake alarm")
Signed-off-by: Doug Berger <opendmb@gmail.com>
---
 drivers/rtc/rtc-brcmstb-waketimer.c | 47 ++++++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 5 deletions(-)

Comments

Florian Fainelli Aug. 31, 2023, 11:27 p.m. UTC | #1
On 8/30/23 15:47, Doug Berger wrote:
> Some devices (e.g. BCM72112) use an alarm_irq interrupt that is
> connected to a level interrupt controller rather than an edge
> interrupt controller. In this case, the interrupt cannot be left
> enabled by the irq handler while preserving the hardware wake-up
> signal on wake capable devices or an interrupt storm will occur.
> 
> The alarm_expired flag is introduced to allow the disabling of
> the interrupt when an alarm expires and to support balancing the
> calls to disable_irq() and enable_irq() in accordance with the
> existing design.
> 
> Fixes: 24304a87158a ("rtc: brcmstb-waketimer: allow use as non-wake alarm")
> Signed-off-by: Doug Berger <opendmb@gmail.com>

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Florian Fainelli Sept. 15, 2023, 6:50 p.m. UTC | #2
On 8/31/23 16:27, Florian Fainelli wrote:
> On 8/30/23 15:47, Doug Berger wrote:
>> Some devices (e.g. BCM72112) use an alarm_irq interrupt that is
>> connected to a level interrupt controller rather than an edge
>> interrupt controller. In this case, the interrupt cannot be left
>> enabled by the irq handler while preserving the hardware wake-up
>> signal on wake capable devices or an interrupt storm will occur.
>>
>> The alarm_expired flag is introduced to allow the disabling of
>> the interrupt when an alarm expires and to support balancing the
>> calls to disable_irq() and enable_irq() in accordance with the
>> existing design.
>>
>> Fixes: 24304a87158a ("rtc: brcmstb-waketimer: allow use as non-wake 
>> alarm")
>> Signed-off-by: Doug Berger <opendmb@gmail.com>
> 
> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>

Alexandre, any chance you could apply this patch? Thanks!
Alexandre Belloni Oct. 1, 2023, 10:15 p.m. UTC | #3
On Wed, 30 Aug 2023 15:47:47 -0700, Doug Berger wrote:
> Some devices (e.g. BCM72112) use an alarm_irq interrupt that is
> connected to a level interrupt controller rather than an edge
> interrupt controller. In this case, the interrupt cannot be left
> enabled by the irq handler while preserving the hardware wake-up
> signal on wake capable devices or an interrupt storm will occur.
> 
> The alarm_expired flag is introduced to allow the disabling of
> the interrupt when an alarm expires and to support balancing the
> calls to disable_irq() and enable_irq() in accordance with the
> existing design.
> 
> [...]

Applied, thanks!

[1/1] rtc: brcmstb-waketimer: support level alarm_irq
      commit: e005a9b35b464be5b2e0194f717e90e7e496785d

Best regards,
diff mbox series

Patch

diff --git a/drivers/rtc/rtc-brcmstb-waketimer.c b/drivers/rtc/rtc-brcmstb-waketimer.c
index 3cdc015692ca..1a65a4e0dc00 100644
--- a/drivers/rtc/rtc-brcmstb-waketimer.c
+++ b/drivers/rtc/rtc-brcmstb-waketimer.c
@@ -1,6 +1,6 @@ 
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright © 2014-2017 Broadcom
+ * Copyright © 2014-2023 Broadcom
  */
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
@@ -34,6 +34,7 @@  struct brcmstb_waketmr {
 	u32 rate;
 	unsigned long rtc_alarm;
 	bool alarm_en;
+	bool alarm_expired;
 };
 
 #define BRCMSTB_WKTMR_EVENT		0x00
@@ -64,6 +65,11 @@  static inline void brcmstb_waketmr_clear_alarm(struct brcmstb_waketmr *timer)
 	writel_relaxed(reg - 1, timer->base + BRCMSTB_WKTMR_ALARM);
 	writel_relaxed(WKTMR_ALARM_EVENT, timer->base + BRCMSTB_WKTMR_EVENT);
 	(void)readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
+	if (timer->alarm_expired) {
+		timer->alarm_expired = false;
+		/* maintain call balance */
+		enable_irq(timer->alarm_irq);
+	}
 }
 
 static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer,
@@ -105,10 +111,17 @@  static irqreturn_t brcmstb_alarm_irq(int irq, void *data)
 		return IRQ_HANDLED;
 
 	if (timer->alarm_en) {
-		if (!device_may_wakeup(timer->dev))
+		if (device_may_wakeup(timer->dev)) {
+			disable_irq_nosync(irq);
+			timer->alarm_expired = true;
+		} else {
 			writel_relaxed(WKTMR_ALARM_EVENT,
 				       timer->base + BRCMSTB_WKTMR_EVENT);
+		}
 		rtc_update_irq(timer->rtc, 1, RTC_IRQF | RTC_AF);
+	} else {
+		writel_relaxed(WKTMR_ALARM_EVENT,
+			       timer->base + BRCMSTB_WKTMR_EVENT);
 	}
 
 	return IRQ_HANDLED;
@@ -221,8 +234,14 @@  static int brcmstb_waketmr_alarm_enable(struct device *dev,
 		    !brcmstb_waketmr_is_pending(timer))
 			return -EINVAL;
 		timer->alarm_en = true;
-		if (timer->alarm_irq)
+		if (timer->alarm_irq) {
+			if (timer->alarm_expired) {
+				timer->alarm_expired = false;
+				/* maintain call balance */
+				enable_irq(timer->alarm_irq);
+			}
 			enable_irq(timer->alarm_irq);
+		}
 	} else if (!enabled && timer->alarm_en) {
 		if (timer->alarm_irq)
 			disable_irq(timer->alarm_irq);
@@ -352,6 +371,17 @@  static int brcmstb_waketmr_suspend(struct device *dev)
 	return brcmstb_waketmr_prepare_suspend(timer);
 }
 
+static int brcmstb_waketmr_suspend_noirq(struct device *dev)
+{
+	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
+
+	/* Catch any alarms occurring prior to noirq */
+	if (timer->alarm_expired && device_may_wakeup(dev))
+		return -EBUSY;
+
+	return 0;
+}
+
 static int brcmstb_waketmr_resume(struct device *dev)
 {
 	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
@@ -368,10 +398,17 @@  static int brcmstb_waketmr_resume(struct device *dev)
 
 	return ret;
 }
+#else
+#define brcmstb_waketmr_suspend		NULL
+#define brcmstb_waketmr_suspend_noirq	NULL
+#define brcmstb_waketmr_resume		NULL
 #endif /* CONFIG_PM_SLEEP */
 
-static SIMPLE_DEV_PM_OPS(brcmstb_waketmr_pm_ops,
-			 brcmstb_waketmr_suspend, brcmstb_waketmr_resume);
+static const struct dev_pm_ops brcmstb_waketmr_pm_ops = {
+	.suspend	= brcmstb_waketmr_suspend,
+	.suspend_noirq	= brcmstb_waketmr_suspend_noirq,
+	.resume		= brcmstb_waketmr_resume,
+};
 
 static const __maybe_unused struct of_device_id brcmstb_waketmr_of_match[] = {
 	{ .compatible = "brcm,brcmstb-waketimer" },