linux-kernel - [PATCH 4/5] rtc: at91: request IRQs with IRQF_SUSPEND

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Message-Id: <1418660152-17185-5-git-send-email-boris.brezillon@free-electrons.com>
Date:	Mon, 15 Dec 2014 17:15:51 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, Mike Turquette <mturquette@...aro.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Andrew Victor <linux@...im.org.za>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [PATCH 4/5] rtc: at91: request IRQs with IRQF_SUSPEND_NOACTION

The IRQ line connected to RTC blocks are often shared with a timer device
which request the IRQ with IRQF_NO_SUSPEND.
Since the RTC drivers are correctly disabling IRQs when entering suspend
we can safely request the IRQ with IRQF_SUSPEND_NOACTION so that irq core
can suspend this specific handler.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
 drivers/rtc/rtc-at91rm9200.c | 2 +-
 drivers/rtc/rtc-at91sam9.c   | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index 70a5d94..0ed504f 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -401,7 +401,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 					AT91_RTC_CALEV);
 
 	ret = devm_request_irq(&pdev->dev, irq, at91_rtc_interrupt,
-				IRQF_SHARED,
+				IRQF_SHARED | IRQF_SUSPEND_NOACTION,
 				"at91_rtc", pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "IRQ %d already in use.\n", irq);
diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 6b9aaf1..e7f8eed 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -421,7 +421,8 @@ static int at91_rtc_probe(struct platform_device *pdev)
 
 	/* register irq handler after we know what name we'll use */
 	ret = devm_request_irq(&pdev->dev, rtc->irq, at91_rtc_interrupt,
-				IRQF_SHARED, dev_name(&rtc->rtcdev->dev), rtc);
+				IRQF_SHARED | IRQF_SUSPEND_NOACTION,
+				dev_name(&rtc->rtcdev->dev), rtc);
 	if (ret) {
 		dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
 		return ret;
-- 
1.9.1

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