From: Soren Brinkmann <soren.brinkmann@xilinx.com>
To: Rob Herring <rob.herring@calxeda.com>,
Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Stephen Warren <swarren@wwwdotorg.org>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Russell King <linux@arm.linux.org.uk>,
Michal Simek <michal.simek@xilinx.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
Soren Brinkmann <soren.brinkmann@xilinx.com>
Subject: [PATCH 4/7] clocksource/cadence_ttc: Adjust interval in clock notifier
Date: Fri, 8 Nov 2013 13:21:14 -0800 [thread overview]
Message-ID: <1383945677-29674-5-git-send-email-soren.brinkmann@xilinx.com> (raw)
In-Reply-To: <1383945677-29674-1-git-send-email-soren.brinkmann@xilinx.com>
The clockevent has to be reprogrammed if the timer's input
clock frequency changes and the timer is in periodic mode, in order to
maintain the correct timer interval.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
---
drivers/clocksource/cadence_ttc_timer.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/clocksource/cadence_ttc_timer.c b/drivers/clocksource/cadence_ttc_timer.c
index a92350b55d32..68a336038d8f 100644
--- a/drivers/clocksource/cadence_ttc_timer.c
+++ b/drivers/clocksource/cadence_ttc_timer.c
@@ -338,6 +338,10 @@ static int ttc_rate_change_clockevent_cb(struct notifier_block *nb,
/* update cached frequency */
ttc->freq = ndata->new_rate;
+ if (ttcce->ce.mode == CLOCK_EVT_MODE_PERIODIC)
+ ttc_set_interval(ttc, DIV_ROUND_CLOSEST(ttc->freq,
+ PRESCALE * HZ));
+
/* fall through */
}
case PRE_RATE_CHANGE:
--
1.8.4.2
next prev parent reply other threads:[~2013-11-08 21:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-08 21:21 [PATCH 0/7] arm: zynq: cpufreq support Soren Brinkmann
2013-11-08 21:21 ` [PATCH 1/7] arm: dt: zynq: Remove 'clock-ranges' from TTC nodes Soren Brinkmann
2013-11-12 15:29 ` Daniel Lezcano
2013-11-08 21:21 ` [PATCH 2/7] arm: dt: zynq: Add 'cpus' node Soren Brinkmann
2013-11-11 18:57 ` Sudeep KarkadaNagesha
2013-11-12 18:06 ` Sören Brinkmann
2013-11-12 21:58 ` Sören Brinkmann
2013-11-13 9:54 ` Sudeep KarkadaNagesha
2013-11-08 21:21 ` [PATCH 3/7] clocksource/cadence_ttc: Store timer frequency in driver data Soren Brinkmann
2013-11-12 16:26 ` Daniel Lezcano
2013-11-08 21:21 ` Soren Brinkmann [this message]
2013-11-12 16:29 ` [PATCH 4/7] clocksource/cadence_ttc: Adjust interval in clock notifier Daniel Lezcano
2013-11-22 18:06 ` Sören Brinkmann
2013-11-08 21:21 ` [PATCH 5/7] clocksource/cadence_ttc: Overhaul clocksource frequency adjustment Soren Brinkmann
2013-11-12 19:01 ` Daniel Lezcano
2013-11-12 21:13 ` Sören Brinkmann
2013-11-13 8:03 ` Viresh Kumar
2013-11-13 10:29 ` Daniel Lezcano
2013-11-13 17:14 ` Sören Brinkmann
2013-11-23 1:30 ` Sören Brinkmann
2013-11-08 21:21 ` [PATCH 6/7] clocksource/cadence_ttc: Use only one counter Soren Brinkmann
2013-11-08 21:21 ` [PATCH 7/7] arm: zynq: Add support for cpufreq Soren Brinkmann
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