From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932360Ab3KHVWf (ORCPT ); Fri, 8 Nov 2013 16:22:35 -0500 Received: from mail-pb0-f54.google.com ([209.85.160.54]:35273 "EHLO mail-pb0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758367Ab3KHVVd (ORCPT ); Fri, 8 Nov 2013 16:21:33 -0500 From: Soren Brinkmann To: Rob Herring , Pawel Moll , Mark Rutland , Stephen Warren , Ian Campbell , Russell King , Michal Simek , Daniel Lezcano , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Soren Brinkmann Subject: [PATCH 4/7] clocksource/cadence_ttc: Adjust interval in clock notifier Date: Fri, 8 Nov 2013 13:21:14 -0800 Message-Id: <1383945677-29674-5-git-send-email-soren.brinkmann@xilinx.com> X-Mailer: git-send-email 1.8.4.2 In-Reply-To: <1383945677-29674-1-git-send-email-soren.brinkmann@xilinx.com> References: <1383945677-29674-1-git-send-email-soren.brinkmann@xilinx.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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