From patchwork Fri Sep 9 11:13:50 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Belloni X-Patchwork-Id: 9323047 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A319E6077F for ; Fri, 9 Sep 2016 11:16:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 929F729DE8 for ; Fri, 9 Sep 2016 11:16:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 83A3B29DF7; Fri, 9 Sep 2016 11:16:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 1E5E429DE8 for ; Fri, 9 Sep 2016 11:16:01 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1biJlV-00075R-Gu; Fri, 09 Sep 2016 11:14:37 +0000 Received: from down.free-electrons.com ([37.187.137.238] helo=mail.free-electrons.com) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1biJlB-0006o0-55 for linux-arm-kernel@lists.infradead.org; Fri, 09 Sep 2016 11:14:18 +0000 Received: by mail.free-electrons.com (Postfix, from userid 110) id DA31A24BF; Fri, 9 Sep 2016 13:13:55 +0200 (CEST) Received: from localhost (unknown [88.191.26.124]) by mail.free-electrons.com (Postfix) with ESMTPSA id A7E59329; Fri, 9 Sep 2016 13:13:55 +0200 (CEST) From: Alexandre Belloni To: Daniel Lezcano Subject: [PATCH v4 3/3] clocksource: timer-atmel-pit: simplify IRQ handler Date: Fri, 9 Sep 2016 13:13:50 +0200 Message-Id: <20160909111350.27534-4-alexandre.belloni@free-electrons.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20160909111350.27534-1-alexandre.belloni@free-electrons.com> References: <20160909111350.27534-1-alexandre.belloni@free-electrons.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160909_041417_404245_557DFDF7 X-CRM114-Status: GOOD ( 10.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Boris Brezillon , Alexandre Belloni , Nicolas Ferre , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Because the PIT is also a proper clocksource, the timekeeping code is already able to handle lost ticks. Reported-by: Thomas Gleixner Acked-by: Nicolas Ferre Signed-off-by: Alexandre Belloni --- drivers/clocksource/timer-atmel-pit.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c index 91cf04704ed1..6555821bbdae 100644 --- a/drivers/clocksource/timer-atmel-pit.c +++ b/drivers/clocksource/timer-atmel-pit.c @@ -152,15 +152,10 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id) /* The PIT interrupt may be disabled, and is shared */ if (clockevent_state_periodic(&data->clkevt) && (pit_read(data->base, AT91_PIT_SR) & AT91_PIT_PITS)) { - unsigned nr_ticks; - /* Get number of ticks performed before irq, and ack it */ - nr_ticks = PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR)); - do { - data->cnt += data->cycle; - data->clkevt.event_handler(&data->clkevt); - nr_ticks--; - } while (nr_ticks); + data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, + AT91_PIT_PIVR)); + data->clkevt.event_handler(&data->clkevt); return IRQ_HANDLED; }