[PATCH 4/7] clocksource/cadence_ttc: Adjust interval in clock notifier

[Soren Brinkmann]

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 at 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