Commit 013be5ad authored by Stephen Boyd's avatar Stephen Boyd Committed by Daniel Lezcano
Browse files

clocksource: qcom: Implement read_current_timer for udelay 



Setup the same timer used as the clocksource to be used as the
read_current_timer implementation. This allows us to support a
stable udelay implementation on MSMs where it's possible for the
CPUs to scale speeds independently of one another.

Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
parent 3f04e3d3

drivers/clocksource/qcom-timer.c

+13 −0
Original line number Original line Diff line number Diff line
@@ -26,6 +26,8 @@ 
#include <linux/of_irq.h>

#include <linux/of_irq.h>

#include <linux/sched_clock.h>

#include <linux/sched_clock.h>





#include <asm/delay.h>



#define TIMER_MATCH_VAL			0x0000

#define TIMER_MATCH_VAL			0x0000

#define TIMER_COUNT_VAL			0x0004

#define TIMER_COUNT_VAL			0x0004

#define TIMER_ENABLE			0x0008

#define TIMER_ENABLE			0x0008
@@ -179,6 +181,15 @@ static u64 notrace msm_sched_clock_read(void) 
	return msm_clocksource.read(&msm_clocksource);

	return msm_clocksource.read(&msm_clocksource);

}

}





static unsigned long msm_read_current_timer(void)

{

	return msm_clocksource.read(&msm_clocksource);

}



static struct delay_timer msm_delay_timer = {

	.read_current_timer = msm_read_current_timer,

};



static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq,

static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq,

				  bool percpu)

				  bool percpu)

{

{
@@ -217,6 +228,8 @@ static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq, 
	if (res)

	if (res)

		pr_err("clocksource_register failed\n");

		pr_err("clocksource_register failed\n");

	sched_clock_register(msm_sched_clock_read, sched_bits, dgt_hz);

	sched_clock_register(msm_sched_clock_read, sched_bits, dgt_hz);

	msm_delay_timer.freq = dgt_hz;

	register_current_timer_delay(&msm_delay_timer);

}

}





#ifdef CONFIG_ARCH_QCOM

#ifdef CONFIG_ARCH_QCOM