/* Caller must hold the device mutex. */
int kgsl_pwrctrl_sleep(struct kgsl_device *device)
{
int status = 0;
KGSL_PWR_INFO(device, "sleep device %d\n", device->id);
/* Work through the legal state transitions */
switch (device->requested_state) {
case KGSL_STATE_NAP:
if (device->pwrctrl.restore_slumber) {
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
break;
}
status = _nap(device);
break;
case KGSL_STATE_SLEEP:
if (device->pwrctrl.restore_slumber)
status = _slumber(device);
else
status = _sleep(device);
break;
case KGSL_STATE_SLUMBER:
status = _slumber(device);
break;
default:
KGSL_PWR_INFO(device, "bad state request 0x%x\n",
device->requested_state);
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
status = -EINVAL;
break;
}
return status;
}
void kgsl_timer(unsigned long data)
{
struct kgsl_device *device = (struct kgsl_device *) data;
KGSL_PWR_INFO(device, "idle timer expired device %d\n", device->id);
if (device->requested_state != KGSL_STATE_SUSPEND) {
if (device->pwrctrl.restore_slumber)
kgsl_pwrctrl_request_state(device, KGSL_STATE_SLUMBER);
else
kgsl_pwrctrl_request_state(device, KGSL_STATE_SLEEP);
/* Have work run in a non-interrupt context. */
queue_work(device->work_queue, &device->idle_check_ws);
}
}
static int
_slumber(struct kgsl_device *device)
{
switch (device->state) {
case KGSL_STATE_ACTIVE:
if (!device->ftbl->isidle(device)) {
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
device->pwrctrl.restore_slumber = true;
return -EBUSY;
}
/* fall through */
case KGSL_STATE_NAP:
case KGSL_STATE_SLEEP:
del_timer_sync(&device->idle_timer);
kgsl_pwrctrl_pwrlevel_change(device, KGSL_PWRLEVEL_NOMINAL);
device->ftbl->suspend_context(device);
device->ftbl->stop(device);
device->pwrctrl.restore_slumber = true;
_sleep_accounting(device);
kgsl_pwrctrl_set_state(device, KGSL_STATE_SLUMBER);
if (device->idle_wakelock.name)
wake_unlock(&device->idle_wakelock);
break;
case KGSL_STATE_SLUMBER:
break;
default:
KGSL_PWR_WARN(device, "unhandled state %s\n",
kgsl_pwrstate_to_str(device->state));
break;
}
return 0;
}
static int
_sleep(struct kgsl_device *device)
{
struct kgsl_pwrctrl *pwr = &device->pwrctrl;
switch (device->state) {
case KGSL_STATE_ACTIVE:
if (!device->ftbl->isidle(device)) {
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
return -EBUSY;
}
/* fall through */
case KGSL_STATE_NAP:
kgsl_pwrctrl_irq(device, KGSL_PWRFLAGS_OFF);
kgsl_pwrctrl_axi(device, KGSL_PWRFLAGS_OFF);
if (pwr->pwrlevels[0].gpu_freq > 0)
clk_set_rate(pwr->grp_clks[0],
pwr->pwrlevels[pwr->num_pwrlevels - 1].
gpu_freq);
_sleep_accounting(device);
kgsl_pwrctrl_clk(device, KGSL_PWRFLAGS_OFF);
kgsl_pwrctrl_set_state(device, KGSL_STATE_SLEEP);
if (device->idle_wakelock.name)
wake_unlock(&device->idle_wakelock);
break;
case KGSL_STATE_SLEEP:
case KGSL_STATE_SLUMBER:
break;
default:
KGSL_PWR_WARN(device, "unhandled state %s\n",
kgsl_pwrstate_to_str(device->state));
break;
}
return 0;
}
void kgsl_idle_check(struct work_struct *work)
{
struct kgsl_device *device = container_of(work, struct kgsl_device,
idle_check_ws);
WARN_ON(device == NULL);
if (device == NULL)
return;
mutex_lock(&device->mutex);
if (device->state & (KGSL_STATE_ACTIVE | KGSL_STATE_NAP)) {
if ((device->requested_state != KGSL_STATE_SLEEP) &&
(device->requested_state != KGSL_STATE_SLUMBER))
kgsl_pwrscale_idle(device);
if (kgsl_pwrctrl_sleep(device) != 0) {
mod_timer(&device->idle_timer,
jiffies +
device->pwrctrl.interval_timeout);
/* If the GPU has been too busy to sleep, make sure *
* that is acurately reflected in the % busy numbers. */
device->pwrctrl.busy.no_nap_cnt++;
if (device->pwrctrl.busy.no_nap_cnt > UPDATE_BUSY) {
kgsl_pwrctrl_busy_time(device, true);
device->pwrctrl.busy.no_nap_cnt = 0;
}
}
} else if (device->state & (KGSL_STATE_HUNG |
KGSL_STATE_DUMP_AND_RECOVER)) {
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
}
mutex_unlock(&device->mutex);
}
void kgsl_timer(unsigned long data)
{
struct kgsl_device *device = (struct kgsl_device *) data;
KGSL_PWR_INFO(device, "idle timer expired device %d\n", device->id);
if (device->requested_state == KGSL_STATE_NONE) {
kgsl_pwrctrl_request_state(device, KGSL_STATE_SLEEP);
/* Have work run in a non-interrupt context. */
queue_work(device->work_queue, &device->idle_check_ws);
}
}
/* Caller must hold the device mutex. */
void kgsl_pwrctrl_wake(struct kgsl_device *device)
{
int status;
kgsl_pwrctrl_request_state(device, KGSL_STATE_ACTIVE);
switch (device->state) {
case KGSL_STATE_SLUMBER:
status = device->ftbl->start(device, 0);
if (status) {
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
KGSL_DRV_ERR(device, "start failed %d\n", status);
break;
}
/* fall through */
case KGSL_STATE_SLEEP:
kgsl_pwrctrl_axi(device, KGSL_PWRFLAGS_ON);
kgsl_pwrscale_wake(device);
/* fall through */
case KGSL_STATE_NAP:
/* Turn on the core clocks */
kgsl_pwrctrl_clk(device, KGSL_PWRFLAGS_ON, KGSL_STATE_ACTIVE);
/* Enable state before turning on irq */
kgsl_pwrctrl_set_state(device, KGSL_STATE_ACTIVE);
kgsl_pwrctrl_irq(device, KGSL_PWRFLAGS_ON);
/* Re-enable HW access */
mod_timer(&device->idle_timer,
jiffies + device->pwrctrl.interval_timeout);
if (device->idle_wakelock.name)
wake_lock(&device->idle_wakelock);
case KGSL_STATE_ACTIVE:
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
break;
default:
KGSL_PWR_WARN(device, "unhandled state %s\n",
kgsl_pwrstate_to_str(device->state));
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
break;
}
}
static int
_nap(struct kgsl_device *device)
{
switch (device->state) {
case KGSL_STATE_ACTIVE:
if (!device->ftbl->isidle(device)) {
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
return -EBUSY;
}
kgsl_pwrctrl_irq(device, KGSL_PWRFLAGS_OFF);
kgsl_pwrctrl_clk(device, KGSL_PWRFLAGS_OFF);
kgsl_pwrctrl_set_state(device, KGSL_STATE_NAP);
if (device->idle_wakelock.name)
wake_unlock(&device->idle_wakelock);
case KGSL_STATE_NAP:
case KGSL_STATE_SLEEP:
case KGSL_STATE_SLUMBER:
break;
default:
kgsl_pwrctrl_request_state(device, KGSL_STATE_NONE);
break;
}
return 0;
}
