Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946209AbbEPIBQ (ORCPT ); Sat, 16 May 2015 04:01:16 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:46640 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1753674AbbEPH7Q (ORCPT ); Sat, 16 May 2015 03:59:16 -0400 X-Listener-Flag: 11101 From: Yingjoe Chen To: Mark Rutland , Matthias Brugger , Thomas Gleixner , Russell King CC: Arnd Bergmann , Olof Johansson , , Stephen Boyd , Pawel Moll , Catalin Marinas , Daniel Lezcano , , Marc Carino , Rob Herring , , Sascha Hauer , Yingjoe Chen , , 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 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: 1704 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 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); -- 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/