diff options
| -rw-r--r-- | arch/arm/mach-omap2/cpuidle34xx.c | 98 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/pm.h | 4 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/pm34xx.c | 4 |
3 files changed, 98 insertions, 8 deletions
diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c index 12f0cbfc289..ff1ad3d06ce 100644 --- a/arch/arm/mach-omap2/cpuidle34xx.c +++ b/arch/arm/mach-omap2/cpuidle34xx.c @@ -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); @@ -141,6 +136,67 @@ return_sleep_time: } /** + * 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 * @state: The target state to be programmed @@ -152,7 +208,7 @@ return_sleep_time: 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__); diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h index 7a9c2d00451..09c0144e90d 100644 --- a/arch/arm/mach-omap2/pm.h +++ b/arch/arm/mach-omap2/pm.h @@ -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); diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index 5087b153b09..5320229926e 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -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); |