From mboxrd@z Thu Jan 1 00:00:00 1970 From: yingjoe.chen@mediatek.com (Yingjoe Chen) Date: Mon, 13 Jul 2015 17:32:46 +0800 Subject: [PATCH 2/5] clocksource: mediatek: Use GPT as sched clock source In-Reply-To: <1436779969-18610-1-git-send-email-yingjoe.chen@mediatek.com> References: <1436779969-18610-1-git-send-email-yingjoe.chen@mediatek.com> Message-ID: <1436779969-18610-3-git-send-email-yingjoe.chen@mediatek.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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