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Commit e21730c4 authored by Raghavendra Kakarla's avatar Raghavendra Kakarla
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lpm-levels: Disable RIMPS timer based PLL/RAIL feature timer 



This patch disables the RIMPS timer based PLL/RAIL trigger
timer in core C4 exit so that it stops the RIMPS from ticking
timer when core C4 exit happen before this timer expires.

Change-Id: I74b3e2222dc3ef5ba0fdebd71b7e86201016fc42
Signed-off-by: default avatarRaghavendra Kakarla <rkakarla@codeaurora.org>
parent 6a4a4954

drivers/cpuidle/lpm-levels.c

+20 −0
Original line number Diff line number Diff line
@@ -274,6 +274,23 @@ static uint32_t get_next_event(struct lpm_cpu *cpu) 
	return ktime_to_us(ktime_sub(next_event, ktime_get()));

}



static void disable_rimps_timer(struct lpm_cpu *cpu)

{

	uint32_t ctrl_val;



	if (!cpu->rimps_tmr_base)

		return;



	spin_lock(&cpu->cpu_lock);

	ctrl_val = readl_relaxed(cpu->rimps_tmr_base + TIMER_CTRL);

	writel_relaxed(ctrl_val & ~(TIMER_CONTROL_EN),

				cpu->rimps_tmr_base + TIMER_CTRL);

	/* Ensure the write is complete before returning. */

	wmb();

	spin_unlock(&cpu->cpu_lock);



}



static void program_rimps_timer(struct lpm_cpu *cpu)

{

	uint32_t ctrl_val, next_event;
@@ -1467,6 +1484,8 @@ static int lpm_cpuidle_enter(struct cpuidle_device *dev, 
	success = (ret == 0);



exit:

	if (idx == cpu->nlevels - 1)

		disable_rimps_timer(cpu);

	end_time = ktime_to_ns(ktime_get());

	lpm_stats_cpu_exit(idx, end_time, success);
@@ -1729,6 +1748,7 @@ static int lpm_suspend_enter(suspend_state_t state) 
	cpu_prepare(lpm_cpu, idx, false);

	cluster_prepare(cluster, cpumask, idx, false, 0);



	disable_rimps_timer(lpm_cpu);

	ret = psci_enter_sleep(lpm_cpu, idx, false);

	success = (ret == 0);