/** Function to handle a GPU state change for the demand power policy
*
* This function is called whenever the GPU has transitioned to another state. It first checks that the transition is
* complete and then moves the state machine to the next state.
*/
static void demand_state_changed(kbase_device *kbdev)
{
kbasep_pm_policy_demand *data = &kbdev->pm.policy_data.demand;
switch(data->state) {
case KBASEP_PM_DEMAND_STATE_CHANGING_POLICY:
case KBASEP_PM_DEMAND_STATE_POWERING_UP:
case KBASEP_PM_DEMAND_STATE_POWERING_DOWN:
if (kbase_pm_get_pwr_active(kbdev)) {
/* Cores are still transitioning - ignore the event */
return;
}
break;
default:
/* Must not call kbase_pm_get_pwr_active here as the clock may be turned off */
break;
}
switch(data->state)
{
case KBASEP_PM_DEMAND_STATE_CHANGING_POLICY:
/* Signal power events before switching the policy */
kbase_pm_power_up_done(kbdev);
kbase_pm_power_down_done(kbdev);
kbase_pm_change_policy(kbdev);
break;
case KBASEP_PM_DEMAND_STATE_POWERING_UP:
data->state = KBASEP_PM_DEMAND_STATE_POWERED_UP;
kbase_pm_power_up_done(kbdev);
/* State changed, try to run jobs */
kbase_js_try_run_jobs(kbdev);
break;
case KBASEP_PM_DEMAND_STATE_POWERING_DOWN:
data->state = KBASEP_PM_DEMAND_STATE_POWERED_DOWN;
/* Disable interrupts and turn the clock off */
kbase_pm_disable_interrupts(kbdev);
kbase_pm_clock_off(kbdev);
kbase_pm_power_down_done(kbdev);
break;
case KBASEP_PM_DEMAND_STATE_POWERED_UP:
/* Core states may have been changed, try to run jobs */
kbase_js_try_run_jobs(kbdev);
break;
default:
break;
}
}
/** Function to handle a GPU state change for the always_on power policy.
*
* This function is called whenever the GPU has transitioned to another state. It first checks that the transition is
* complete and then moves the state machine to the next state.
*
* @param kbdev The kbase device structure for the device
*/
static void always_on_state_changed(kbase_device *kbdev)
{
kbasep_pm_policy_always_on *data = &kbdev->pm.policy_data.always_on;
switch(data->state)
{
case KBASEP_PM_ALWAYS_ON_STATE_POWERING_UP:
if (kbase_pm_get_pwr_active(kbdev))
{
/* Cores still transitioning */
return;
}
/* All cores have transitioned, inform the OS */
kbase_pm_power_up_done(kbdev);
data->state = KBASEP_PM_ALWAYS_ON_STATE_POWERED_UP;
break;
case KBASEP_PM_ALWAYS_ON_STATE_POWERING_DOWN:
if (kbase_pm_get_pwr_active(kbdev))
{
/* Cores still transitioning */
return;
}
/* All cores have transitioned, turn the clock and interrupts off */
kbase_pm_disable_interrupts(kbdev);
kbase_pm_clock_off(kbdev);
/* Inform the OS */
kbase_pm_power_down_done(kbdev);
data->state = KBASEP_PM_ALWAYS_ON_STATE_POWERED_DOWN;
break;
case KBASEP_PM_ALWAYS_ON_STATE_CHANGING_POLICY:
if (kbase_pm_get_pwr_active(kbdev))
{
/* Cores still transitioning */
return;
}
/* All cores have transitioned, inform the system we can change policy*/
kbase_pm_change_policy(kbdev);
break;
default:
break;
}
}
/** Function to handle a GPU state change for the coarse_demand power policy.
*
* This function is called whenever the GPU has transitioned to another state. It first checks that the transition is
* complete and then moves the state machine to the next state.
*
* @param kbdev The kbase device structure for the device
*/
static void coarse_demand_state_changed(kbase_device *kbdev)
{
kbasep_pm_policy_coarse_demand *data = &kbdev->pm.policy_data.coarse_demand;
/* No need to early-out if cores transitioning during the POWERING_UP state */
if (data->state != KBASEP_PM_COARSE_DEMAND_STATE_POWERING_UP
&& kbase_pm_get_pwr_active(kbdev)) {
/* Cores are still transitioning - ignore the event */
return;
}
switch(data->state)
{
case KBASEP_PM_COARSE_DEMAND_STATE_POWERING_UP:
/* All cores are ready, inform the OS */
data->state = KBASEP_PM_COARSE_DEMAND_STATE_POWERED_UP;
kbase_pm_power_up_done(kbdev);
/*
* No need to submit jobs:
* - All cores will be powered on
* - Cores are made available even while they're transitioning to 'powered on'
* - We signal power_up_done after calling kbase_pm_check_transitions(), which makes the cores available.
* Hence, the submission of jobs will already be handled by the call-path that invoked kbase_pm_context_active()
*/
break;
case KBASEP_PM_COARSE_DEMAND_STATE_POWERING_DOWN:
data->state = KBASEP_PM_COARSE_DEMAND_STATE_POWERED_DOWN;
/* All cores have transitioned, turn the clock and interrupts off */
kbase_pm_clock_off(kbdev);
/* Inform the OS */
kbase_pm_power_down_done(kbdev);
break;
case KBASEP_PM_COARSE_DEMAND_STATE_CHANGING_POLICY:
/* Signal power events before switching the policy */
kbase_pm_power_up_done(kbdev);
kbase_pm_power_down_done(kbdev);
kbase_pm_change_policy(kbdev);
break;
default:
break;
}
}
void kbase_pm_do_poweroff(kbase_device *kbdev)
{
unsigned long flags;
mali_bool cores_are_available;
lockdep_assert_held(&kbdev->pm.lock);
spin_lock_irqsave(&kbdev->pm.power_change_lock, flags);
/* Force all cores off */
kbdev->pm.desired_shader_state = 0;
/* Force all cores to be unavailable, in the situation where
* transitions are in progress for some cores but not others,
* and kbase_pm_check_transitions_nolock can not immediately
* power off the cores */
kbdev->shader_available_bitmap = 0;
kbdev->tiler_available_bitmap = 0;
kbdev->l2_available_bitmap = 0;
KBASE_TIMELINE_PM_CHECKTRANS(kbdev, SW_FLOW_PM_CHECKTRANS_PM_DO_POWEROFF_START);
cores_are_available = kbase_pm_check_transitions_nolock(kbdev);
KBASE_TIMELINE_PM_CHECKTRANS(kbdev, SW_FLOW_PM_CHECKTRANS_PM_DO_POWEROFF_END);
/* Don't need 'cores_are_available', because we don't return anything */
CSTD_UNUSED(cores_are_available);
spin_unlock_irqrestore(&kbdev->pm.power_change_lock, flags);
/* NOTE: We won't wait to reach the core's desired state, even if we're
* powering off the GPU itself too. It's safe to cut the power whilst
* they're transitioning to off, because the cores should be idle and all
* cache flushes should already have occurred */
/* Consume any change-state events */
kbase_timeline_pm_check_handle_event(kbdev, KBASE_TIMELINE_PM_EVENT_GPU_STATE_CHANGED);
/* Disable interrupts and turn the clock off */
kbase_pm_clock_off(kbdev);
}
