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Commit f14665f6 authored by Yingjoe Chen's avatar Yingjoe Chen Committed by Daniel Lezcano
Browse files

clocksource/drivers/mediatek: Use GPT as sched clock source 



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: default avatarYingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Acked-by: default avatarMatthias Brugger <matthias.bgg@gmail.com>
parent fc686d00

drivers/clocksource/mtk_timer.c

+10 −0
Original line number Diff line number Diff line
@@ -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);