linux-kernel - [PATCH 2/2] time: clockevents: Adjust timer interval when frequency changes

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Message-Id: <1386635686-15686-3-git-send-email-soren.brinkmann@xilinx.com>
Date:	Mon,  9 Dec 2013 16:34:46 -0800
From:	Soren Brinkmann <soren.brinkmann@...inx.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Russell King <linux@....linux.org.uk>,
	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	Sören Brinkmann <soren.brinkmann@...inx.com>
Subject: [PATCH 2/2] time: clockevents: Adjust timer interval when frequency changes

To adjust the timer's interval in periodic mode, the clockevent device
is put into periodic mode during clockevents_update_freq() in case the
timer is in periodic mode.

Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
---
 kernel/time/clockevents.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 641d91003a45..f85e5fda9c66 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -443,10 +443,13 @@ int __clockevents_update_freq(struct clock_event_device *dev, u32 freq)
 {
 	clockevents_config(dev, freq);
 
-	if (dev->mode != CLOCK_EVT_MODE_ONESHOT)
-		return 0;
+	if (dev->mode == CLOCK_EVT_MODE_ONESHOT)
+		return clockevents_program_event(dev, dev->next_event, false);
+
+	if (dev->mode == CLOCK_EVT_MODE_PERIODIC)
+		dev->set_mode(CLOCK_EVT_MODE_PERIODIC, dev);
 
-	return clockevents_program_event(dev, dev->next_event, false);
+	return 0;
 }
 
 /**
-- 
1.8.5.1

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