From patchwork Sat May 16 07:58:25 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yingjoe Chen X-Patchwork-Id: 6419731 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A16DAC0432 for ; Sat, 16 May 2015 08:05:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D4760203F7 for ; Sat, 16 May 2015 08:05:26 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1E3202057F for ; Sat, 16 May 2015 08:05:26 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YtX3P-0003w2-7k; Sat, 16 May 2015 08:02:39 +0000 Received: from [210.61.82.184] (helo=mailgw02.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YtX0f-0000tO-LY; Sat, 16 May 2015 07:59:50 +0000 X-Listener-Flag: 11101 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 905592895; Sat, 16 May 2015 15:59:12 +0800 Received: from mtksdtcf02.mediatek.inc (10.21.12.142) by mtkhts07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.181.6; Sat, 16 May 2015 15:59:11 +0800 From: Yingjoe Chen To: Mark Rutland , Matthias Brugger , Thomas Gleixner , Russell King Subject: [PATCH v2 4/9] clocksource: mediatek: Use GPT as sched clock source Date: Sat, 16 May 2015 15:58:25 +0800 Message-ID: <1431763110-443-5-git-send-email-yingjoe.chen@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1431763110-443-1-git-send-email-yingjoe.chen@mediatek.com> References: <1431763110-443-1-git-send-email-yingjoe.chen@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150516_005949_947345_04D63230 X-CRM114-Status: UNSURE ( 7.46 ) X-CRM114-Notice: Please train this message. X-Spam-Score: 1.3 (+) Cc: devicetree@vger.kernel.org, Arnd Bergmann , Pawel Moll , Catalin Marinas , Daniel Lezcano , Stephen Boyd , linux-kernel@vger.kernel.org, Marc Carino , Rob Herring , linux-mediatek@lists.infradead.org, Sascha Hauer , Olof Johansson , Yingjoe Chen , srv_heupstream@mediatek.com, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When cpu is in deep idle, arch timer will stop counting. Setup GPT as sched clock source so it can keep counting in idle. Signed-off-by: Yingjoe Chen Acked-by: Daniel Lezcano --- drivers/clocksource/mtk_timer.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c index 91206f9..fe7cf72 100644 --- a/drivers/clocksource/mtk_timer.c +++ b/drivers/clocksource/mtk_timer.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #define GPT_IRQ_EN_REG 0x00 @@ -59,6 +60,13 @@ struct mtk_clock_event_device { struct clock_event_device dev; }; +static void __iomem *gpt_base __read_mostly; + +static u64 notrace mtk_read_sched_clock(void) +{ + return readl_relaxed(gpt_base + TIMER_CNT_REG(GPT_CLK_SRC)); +} + static inline struct mtk_clock_event_device *to_mtk_clk( struct clock_event_device *c) { @@ -243,6 +251,8 @@ static void __init mtk_timer_init(struct device_node *node) mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN, 1); clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC), node->name, rate, 300, 32, clocksource_mmio_readl_up); + gpt_base = evt->gpt_base; + sched_clock_register(mtk_read_sched_clock, 32, rate); /* Configure clock event */ mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT, 0);