Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752395AbbGMJdt (ORCPT ); Mon, 13 Jul 2015 05:33:49 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:51346 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751096AbbGMJdn (ORCPT ); Mon, 13 Jul 2015 05:33:43 -0400 X-Listener-Flag: 11101 From: Yingjoe Chen To: Matthias Brugger , Thomas Gleixner , Stephen Boyd , Michael Turquette , James Liao CC: Russell King , , Arnd Bergmann , Catalin Marinas , Daniel Lezcano , , Rob Herring , , Sascha Hauer , Olof Johansson , Yingjoe Chen , , , Daniel Kurtz , Subject: [PATCH 2/5] clocksource: mediatek: Use GPT as sched clock source Date: Mon, 13 Jul 2015 17:32:46 +0800 Message-ID: <1436779969-18610-3-git-send-email-yingjoe.chen@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1436779969-18610-1-git-send-email-yingjoe.chen@mediatek.com> References: <1436779969-18610-1-git-send-email-yingjoe.chen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1726 Lines: 51 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 --- 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 237c20b..ae95b29 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_sched_reg __read_mostly; + +static u64 notrace mtk_read_sched_clock(void) +{ + return readl_relaxed(gpt_sched_reg); +} + static inline struct mtk_clock_event_device *to_mtk_clk( struct clock_event_device *c) { @@ -242,6 +250,8 @@ static void __init mtk_timer_init(struct device_node *node) mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN, true); clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC), node->name, rate, 300, 32, clocksource_mmio_readl_up); + gpt_sched_reg = evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC); + sched_clock_register(mtk_read_sched_clock, 32, rate); /* Configure clock event */ mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT, false); -- 1.8.1.1.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/