diff options
Diffstat (limited to 'arch/arm/mach-omap2/cpuidle34xx.c')
| -rw-r--r-- | arch/arm/mach-omap2/cpuidle34xx.c | 226 |
1 files changed, 190 insertions, 36 deletions
diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c index 12f0cbfc289..3d3d035db9a 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; @@ -60,6 +62,30 @@ struct omap3_processor_cx omap3_power_states[OMAP3_MAX_STATES]; struct omap3_processor_cx current_cx_state; struct powerdomain *mpu_pd, *core_pd; +/* + * The latencies/thresholds for various C states have + * to be configured from the respective board files. + * These are some default values (which might not provide + * the best power savings) used on boards which do not + * pass these details from the board file. + */ +static struct cpuidle_params cpuidle_params_table[] = { + /* C1 */ + {1, 2, 2, 5}, + /* C2 */ + {1, 10, 10, 30}, + /* C3 */ + {1, 50, 50, 300}, + /* C4 */ + {1, 1500, 1800, 4000}, + /* C5 */ + {1, 2500, 7500, 12000}, + /* C6 */ + {1, 3000, 8500, 15000}, + /* C7 */ + {1, 10000, 30000, 300000}, +}; + static int omap3_idle_bm_check(void) { if (!omap3_can_sleep()) @@ -104,13 +130,6 @@ 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 +160,67 @@ 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 +232,7 @@ 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 +245,50 @@ 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; + } + } +} + +void omap3_pm_init_cpuidle(struct cpuidle_params *cpuidle_board_params) +{ + int i; + + if (!cpuidle_board_params) + return; + + for (i = OMAP3_STATE_C1; i < OMAP3_MAX_STATES; i++) { + cpuidle_params_table[i].valid = + cpuidle_board_params[i].valid; + cpuidle_params_table[i].sleep_latency = + cpuidle_board_params[i].sleep_latency; + cpuidle_params_table[i].wake_latency = + cpuidle_board_params[i].wake_latency; + cpuidle_params_table[i].threshold = + cpuidle_board_params[i].threshold; + } + return; +} + /* omap3_init_power_states - Initialises the OMAP3 specific C states. * * Below is the desciption of each C state. @@ -179,75 +303,103 @@ DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev); void omap_init_power_states(void) { /* C1 . MPU WFI + Core active */ - omap3_power_states[OMAP3_STATE_C1].valid = 1; + omap3_power_states[OMAP3_STATE_C1].valid = + cpuidle_params_table[OMAP3_STATE_C1].valid; omap3_power_states[OMAP3_STATE_C1].type = OMAP3_STATE_C1; - omap3_power_states[OMAP3_STATE_C1].sleep_latency = 2; - omap3_power_states[OMAP3_STATE_C1].wakeup_latency = 2; - omap3_power_states[OMAP3_STATE_C1].threshold = 5; + omap3_power_states[OMAP3_STATE_C1].sleep_latency = + cpuidle_params_table[OMAP3_STATE_C1].sleep_latency; + omap3_power_states[OMAP3_STATE_C1].wakeup_latency = + cpuidle_params_table[OMAP3_STATE_C1].wake_latency; + omap3_power_states[OMAP3_STATE_C1].threshold = + cpuidle_params_table[OMAP3_STATE_C1].threshold; omap3_power_states[OMAP3_STATE_C1].mpu_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C1].core_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C1].flags = CPUIDLE_FLAG_TIME_VALID; /* C2 . MPU WFI + Core inactive */ - omap3_power_states[OMAP3_STATE_C2].valid = 1; + omap3_power_states[OMAP3_STATE_C2].valid = + cpuidle_params_table[OMAP3_STATE_C2].valid; omap3_power_states[OMAP3_STATE_C2].type = OMAP3_STATE_C2; - omap3_power_states[OMAP3_STATE_C2].sleep_latency = 10; - omap3_power_states[OMAP3_STATE_C2].wakeup_latency = 10; - omap3_power_states[OMAP3_STATE_C2].threshold = 30; + omap3_power_states[OMAP3_STATE_C2].sleep_latency = + cpuidle_params_table[OMAP3_STATE_C2].sleep_latency; + omap3_power_states[OMAP3_STATE_C2].wakeup_latency = + cpuidle_params_table[OMAP3_STATE_C2].wake_latency; + omap3_power_states[OMAP3_STATE_C2].threshold = + cpuidle_params_table[OMAP3_STATE_C2].threshold; omap3_power_states[OMAP3_STATE_C2].mpu_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C2].core_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C2].flags = CPUIDLE_FLAG_TIME_VALID; /* C3 . MPU CSWR + Core inactive */ - omap3_power_states[OMAP3_STATE_C3].valid = 1; + omap3_power_states[OMAP3_STATE_C3].valid = + cpuidle_params_table[OMAP3_STATE_C3].valid; omap3_power_states[OMAP3_STATE_C3].type = OMAP3_STATE_C3; - omap3_power_states[OMAP3_STATE_C3].sleep_latency = 50; - omap3_power_states[OMAP3_STATE_C3].wakeup_latency = 50; - omap3_power_states[OMAP3_STATE_C3].threshold = 300; + omap3_power_states[OMAP3_STATE_C3].sleep_latency = + cpuidle_params_table[OMAP3_STATE_C3].sleep_latency; + omap3_power_states[OMAP3_STATE_C3].wakeup_latency = + cpuidle_params_table[OMAP3_STATE_C3].wake_latency; + omap3_power_states[OMAP3_STATE_C3].threshold = + cpuidle_params_table[OMAP3_STATE_C3].threshold; omap3_power_states[OMAP3_STATE_C3].mpu_state = PWRDM_POWER_RET; omap3_power_states[OMAP3_STATE_C3].core_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C3].flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_CHECK_BM; /* C4 . MPU OFF + Core inactive */ - omap3_power_states[OMAP3_STATE_C4].valid = 1; + omap3_power_states[OMAP3_STATE_C4].valid = + cpuidle_params_table[OMAP3_STATE_C4].valid; omap3_power_states[OMAP3_STATE_C4].type = OMAP3_STATE_C4; - omap3_power_states[OMAP3_STATE_C4].sleep_latency = 1500; - omap3_power_states[OMAP3_STATE_C4].wakeup_latency = 1800; - omap3_power_states[OMAP3_STATE_C4].threshold = 4000; + omap3_power_states[OMAP3_STATE_C4].sleep_latency = + cpuidle_params_table[OMAP3_STATE_C4].sleep_latency; + omap3_power_states[OMAP3_STATE_C4].wakeup_latency = + cpuidle_params_table[OMAP3_STATE_C4].wake_latency; + omap3_power_states[OMAP3_STATE_C4].threshold = + cpuidle_params_table[OMAP3_STATE_C4].threshold; omap3_power_states[OMAP3_STATE_C4].mpu_state = PWRDM_POWER_OFF; omap3_power_states[OMAP3_STATE_C4].core_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C4].flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_CHECK_BM; /* C5 . MPU CSWR + Core CSWR*/ - omap3_power_states[OMAP3_STATE_C5].valid = 1; + omap3_power_states[OMAP3_STATE_C5].valid = + cpuidle_params_table[OMAP3_STATE_C5].valid; omap3_power_states[OMAP3_STATE_C5].type = OMAP3_STATE_C5; - omap3_power_states[OMAP3_STATE_C5].sleep_latency = 2500; - omap3_power_states[OMAP3_STATE_C5].wakeup_latency = 7500; - omap3_power_states[OMAP3_STATE_C5].threshold = 12000; + omap3_power_states[OMAP3_STATE_C5].sleep_latency = + cpuidle_params_table[OMAP3_STATE_C5].sleep_latency; + omap3_power_states[OMAP3_STATE_C5].wakeup_latency = + cpuidle_params_table[OMAP3_STATE_C5].wake_latency; + omap3_power_states[OMAP3_STATE_C5].threshold = + cpuidle_params_table[OMAP3_STATE_C5].threshold; omap3_power_states[OMAP3_STATE_C5].mpu_state = PWRDM_POWER_RET; omap3_power_states[OMAP3_STATE_C5].core_state = PWRDM_POWER_RET; omap3_power_states[OMAP3_STATE_C5].flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_CHECK_BM; /* C6 . MPU OFF + Core CSWR */ - omap3_power_states[OMAP3_STATE_C6].valid = 1; + omap3_power_states[OMAP3_STATE_C6].valid = + cpuidle_params_table[OMAP3_STATE_C6].valid; omap3_power_states[OMAP3_STATE_C6].type = OMAP3_STATE_C6; - omap3_power_states[OMAP3_STATE_C6].sleep_latency = 3000; - omap3_power_states[OMAP3_STATE_C6].wakeup_latency = 8500; - omap3_power_states[OMAP3_STATE_C6].threshold = 15000; + omap3_power_states[OMAP3_STATE_C6].sleep_latency = + cpuidle_params_table[OMAP3_STATE_C6].sleep_latency; + omap3_power_states[OMAP3_STATE_C6].wakeup_latency = + cpuidle_params_table[OMAP3_STATE_C6].wake_latency; + omap3_power_states[OMAP3_STATE_C6].threshold = + cpuidle_params_table[OMAP3_STATE_C6].threshold; omap3_power_states[OMAP3_STATE_C6].mpu_state = PWRDM_POWER_OFF; omap3_power_states[OMAP3_STATE_C6].core_state = PWRDM_POWER_RET; omap3_power_states[OMAP3_STATE_C6].flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_CHECK_BM; /* C7 . MPU OFF + Core OFF */ - omap3_power_states[OMAP3_STATE_C7].valid = 1; + omap3_power_states[OMAP3_STATE_C7].valid = + cpuidle_params_table[OMAP3_STATE_C7].valid; omap3_power_states[OMAP3_STATE_C7].type = OMAP3_STATE_C7; - omap3_power_states[OMAP3_STATE_C7].sleep_latency = 10000; - omap3_power_states[OMAP3_STATE_C7].wakeup_latency = 30000; - omap3_power_states[OMAP3_STATE_C7].threshold = 300000; + omap3_power_states[OMAP3_STATE_C7].sleep_latency = + cpuidle_params_table[OMAP3_STATE_C7].sleep_latency; + omap3_power_states[OMAP3_STATE_C7].wakeup_latency = + cpuidle_params_table[OMAP3_STATE_C7].wake_latency; + omap3_power_states[OMAP3_STATE_C7].threshold = + cpuidle_params_table[OMAP3_STATE_C7].threshold; omap3_power_states[OMAP3_STATE_C7].mpu_state = PWRDM_POWER_OFF; omap3_power_states[OMAP3_STATE_C7].core_state = PWRDM_POWER_OFF; omap3_power_states[OMAP3_STATE_C7].flags = CPUIDLE_FLAG_TIME_VALID | @@ -302,6 +454,8 @@ 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__); |