From: Yingjoe Chen <yingjoe.c...@mediatek.com> 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 <yingjoe.c...@mediatek.com> Signed-off-by: Daniel Lezcano <daniel.lezc...@linaro.org> Acked-by: Stephen Boyd <sb...@codeaurora.org> Acked-by: Matthias Brugger <matthias....@gmail.com> --- 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 c8badc4..fbfc746 100644 --- a/drivers/clocksource/mtk_timer.c +++ b/drivers/clocksource/mtk_timer.c @@ -24,6 +24,7 @@ #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> +#include <linux/sched_clock.h> #include <linux/slab.h> #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) { @@ -230,6 +238,8 @@ static void __init mtk_timer_init(struct device_node *node) mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN); 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); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/