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Commit 6af83b38 authored by Sanjeev Premi's avatar Sanjeev Premi Committed by Kevin Hilman
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OMAP3: cpuidle: Update statistics for correct state 



When 'enable_off_mode' is 0, the target power state for MPU
and CORE was locally changed to PWRDM_POWER_RET but, the
statistics are updated for idle state originally selected
by the governor.

This patch 'invalidates' the idle states that lead either of
MPU or Core to PWRDM_POWER_OFF state when 'enable_off_mode'
is '0'. The states are valid once 'enable_off_mode' is set
to '1'.

Added function next_valid_state() to check if current state
is valid; else get the next valid state. It is called from
omap3_enter_idle_bm().

Signed-off-by: default avatarSanjeev Premi <premi@ti.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent 80c20d54

arch/arm/mach-omap2/cpuidle34xx.c

+90 −8
Original line number Diff line number Diff line
@@ -45,6 +45,8 @@ 
#define OMAP3_STATE_C6 5 /* C6 - MPU OFF + Core RET */

#define OMAP3_STATE_C7 6 /* C7 - MPU OFF + Core OFF */



#define OMAP3_STATE_MAX OMAP3_STATE_C7



struct omap3_processor_cx {

	u8 valid;

	u8 type;
@@ -104,13 +106,6 @@ static int omap3_enter_idle(struct cpuidle_device *dev, 
	local_irq_disable();

	local_fiq_disable();



	if (!enable_off_mode) {

		if (mpu_state < PWRDM_POWER_RET)

			mpu_state = PWRDM_POWER_RET;

		if (core_state < PWRDM_POWER_RET)

			core_state = PWRDM_POWER_RET;

	}



	pwrdm_set_next_pwrst(mpu_pd, mpu_state);

	pwrdm_set_next_pwrst(core_pd, core_state);
@@ -140,6 +135,67 @@ static int omap3_enter_idle(struct cpuidle_device *dev, 
	return ts_idle.tv_nsec / NSEC_PER_USEC + ts_idle.tv_sec * USEC_PER_SEC;

}



/**

 * next_valid_state - Find next valid c-state

 * @dev: cpuidle device

 * @state: Currently selected c-state

 *

 * If the current state is valid, it is returned back to the caller.

 * Else, this function searches for a lower c-state which is still

 * valid (as defined in omap3_power_states[]).

 */

static struct cpuidle_state *next_valid_state(struct cpuidle_device *dev,

						struct cpuidle_state *curr)

{

	struct cpuidle_state *next = NULL;

	struct omap3_processor_cx *cx;



	cx = (struct omap3_processor_cx *)cpuidle_get_statedata(curr);



	/* Check if current state is valid */

	if (cx->valid) {

		return curr;

	} else {

		u8 idx = OMAP3_STATE_MAX;



		/*

		 * Reach the current state starting at highest C-state

		 */

		for (; idx >= OMAP3_STATE_C1; idx--) {

			if (&dev->states[idx] == curr) {

				next = &dev->states[idx];

				break;

			}

		}



		/*

		 * Should never hit this condition.

		 */

		WARN_ON(next == NULL);



		/*

		 * Drop to next valid state.

		 * Start search from the next (lower) state.

		 */

		idx--;

		for (; idx >= OMAP3_STATE_C1; idx--) {

			struct omap3_processor_cx *cx;



			cx = cpuidle_get_statedata(&dev->states[idx]);

			if (cx->valid) {

				next = &dev->states[idx];

				break;

			}

		}

		/*

		 * C1 and C2 are always valid.

		 * So, no need to check for 'next==NULL' outside this loop.

		 */

	}



	return next;

}



/**

 * omap3_enter_idle_bm - Checks for any bus activity

 * @dev: cpuidle device
@@ -152,7 +208,7 @@ static int omap3_enter_idle(struct cpuidle_device *dev, 
static int omap3_enter_idle_bm(struct cpuidle_device *dev,

			       struct cpuidle_state *state)

{

	struct cpuidle_state *new_state = state;

	struct cpuidle_state *new_state = next_valid_state(dev, state);



	if ((state->flags & CPUIDLE_FLAG_CHECK_BM) && omap3_idle_bm_check()) {

		BUG_ON(!dev->safe_state);
@@ -165,6 +221,30 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev, 


DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev);



/**

 * omap3_cpuidle_update_states - Update the cpuidle states.

 *

 * Currently, this function toggles the validity of idle states based upon

 * the flag 'enable_off_mode'. When the flag is set all states are valid.

 * Else, states leading to OFF state set to be invalid.

 */

void omap3_cpuidle_update_states(void)

{

	int i;



	for (i = OMAP3_STATE_C1; i < OMAP3_MAX_STATES; i++) {

		struct omap3_processor_cx *cx = &omap3_power_states[i];



		if (enable_off_mode) {

			cx->valid = 1;

		} else {

			if ((cx->mpu_state == PWRDM_POWER_OFF) ||

				(cx->core_state	== PWRDM_POWER_OFF))

				cx->valid = 0;

		}

	}

}



/* omap3_init_power_states - Initialises the OMAP3 specific C states.

 *

 * Below is the desciption of each C state.
@@ -302,6 +382,8 @@ int __init omap3_idle_init(void) 
		return -EINVAL;

	dev->state_count = count;



	omap3_cpuidle_update_states();



	if (cpuidle_register_device(dev)) {

		printk(KERN_ERR "%s: CPUidle register device failed\n",

		       __func__);

arch/arm/mach-omap2/pm.h

+4 −0
Original line number Diff line number Diff line
@@ -37,6 +37,10 @@ extern int omap2_pm_debug; 
#define omap2_pm_debug				0

#endif



#if defined(CONFIG_CPU_IDLE)

extern void omap3_cpuidle_update_states(void);

#endif



#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)

extern void pm_dbg_update_time(struct powerdomain *pwrdm, int prev);

extern int pm_dbg_regset_save(int reg_set);

arch/arm/mach-omap2/pm34xx.c

+4 −0
Original line number Diff line number Diff line
@@ -941,6 +941,10 @@ void omap3_pm_off_mode_enable(int enable) 
	else

		state = PWRDM_POWER_RET;



#ifdef CONFIG_CPU_IDLE

	omap3_cpuidle_update_states();

#endif



	list_for_each_entry(pwrst, &pwrst_list, node) {

		pwrst->next_state = state;

		set_pwrdm_state(pwrst->pwrdm, state);