drm/radeon/kms: use wait queue (events) for VBLANK sync
This already simplifies code significally and makes it maintaible
in case of adding memory reclocking plus voltage changing in future.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 1cecd73..a8e151e 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -25,10 +25,10 @@
#define RADEON_IDLE_LOOP_MS 100
#define RADEON_RECLOCK_DELAY_MS 200
+#define RADEON_WAIT_VBLANK_TIMEOUT 200
static void radeon_pm_set_clocks_locked(struct radeon_device *rdev);
static void radeon_pm_set_clocks(struct radeon_device *rdev);
-static void radeon_pm_reclock_work_handler(struct work_struct *work);
static void radeon_pm_idle_work_handler(struct work_struct *work);
static int radeon_debugfs_pm_init(struct radeon_device *rdev);
@@ -214,7 +214,6 @@
rdev->pm.state = PM_STATE_DISABLED;
rdev->pm.planned_action = PM_ACTION_NONE;
rdev->pm.downclocked = false;
- rdev->pm.vblank_callback = false;
if (rdev->bios) {
if (rdev->is_atom_bios)
@@ -228,7 +227,6 @@
DRM_ERROR("Failed to register debugfs file for PM!\n");
}
- INIT_WORK(&rdev->pm.reclock_work, radeon_pm_reclock_work_handler);
INIT_DELAYED_WORK(&rdev->pm.idle_work, radeon_pm_idle_work_handler);
if (radeon_dynpm != -1 && radeon_dynpm) {
@@ -266,26 +264,14 @@
if (count > 1) {
if (rdev->pm.state == PM_STATE_ACTIVE) {
- wait_queue_head_t wait;
- init_waitqueue_head(&wait);
-
cancel_delayed_work(&rdev->pm.idle_work);
rdev->pm.state = PM_STATE_PAUSED;
rdev->pm.planned_action = PM_ACTION_UPCLOCK;
- radeon_get_power_state(rdev, rdev->pm.planned_action);
- rdev->pm.vblank_callback = true;
-
- mutex_unlock(&rdev->pm.mutex);
-
- wait_event_timeout(wait, !rdev->pm.downclocked,
- msecs_to_jiffies(300));
- if (!rdev->pm.downclocked)
+ if (rdev->pm.downclocked)
radeon_pm_set_clocks(rdev);
DRM_DEBUG("radeon: dynamic power management deactivated\n");
- } else {
- mutex_unlock(&rdev->pm.mutex);
}
} else if (count == 1) {
/* TODO: Increase clocks if needed for current mode */
@@ -293,8 +279,7 @@
if (rdev->pm.state == PM_STATE_MINIMUM) {
rdev->pm.state = PM_STATE_ACTIVE;
rdev->pm.planned_action = PM_ACTION_UPCLOCK;
- radeon_get_power_state(rdev, rdev->pm.planned_action);
- radeon_pm_set_clocks_locked(rdev);
+ radeon_pm_set_clocks(rdev);
queue_delayed_work(rdev->wq, &rdev->pm.idle_work,
msecs_to_jiffies(RADEON_IDLE_LOOP_MS));
@@ -305,8 +290,6 @@
msecs_to_jiffies(RADEON_IDLE_LOOP_MS));
DRM_DEBUG("radeon: dynamic power management activated\n");
}
-
- mutex_unlock(&rdev->pm.mutex);
}
else { /* count == 0 */
if (rdev->pm.state != PM_STATE_MINIMUM) {
@@ -314,12 +297,11 @@
rdev->pm.state = PM_STATE_MINIMUM;
rdev->pm.planned_action = PM_ACTION_MINIMUM;
- radeon_get_power_state(rdev, rdev->pm.planned_action);
- radeon_pm_set_clocks_locked(rdev);
+ radeon_pm_set_clocks(rdev);
}
-
- mutex_unlock(&rdev->pm.mutex);
}
+
+ mutex_unlock(&rdev->pm.mutex);
}
static void radeon_pm_set_clocks_locked(struct radeon_device *rdev)
@@ -344,31 +326,32 @@
static void radeon_pm_set_clocks(struct radeon_device *rdev)
{
- mutex_lock(&rdev->pm.mutex);
- /* new VBLANK irq may come before handling previous one */
- if (rdev->pm.vblank_callback) {
- mutex_lock(&rdev->cp.mutex);
- if (rdev->pm.req_vblank & (1 << 0)) {
- rdev->pm.req_vblank &= ~(1 << 0);
- drm_vblank_put(rdev->ddev, 0);
- }
- if (rdev->pm.req_vblank & (1 << 1)) {
- rdev->pm.req_vblank &= ~(1 << 1);
- drm_vblank_put(rdev->ddev, 1);
- }
- rdev->pm.vblank_callback = false;
- radeon_pm_set_clocks_locked(rdev);
- mutex_unlock(&rdev->cp.mutex);
- }
- mutex_unlock(&rdev->pm.mutex);
-}
+ radeon_get_power_state(rdev, rdev->pm.planned_action);
+ mutex_lock(&rdev->cp.mutex);
-static void radeon_pm_reclock_work_handler(struct work_struct *work)
-{
- struct radeon_device *rdev;
- rdev = container_of(work, struct radeon_device,
- pm.reclock_work);
- radeon_pm_set_clocks(rdev);
+ if (rdev->pm.active_crtcs & (1 << 0)) {
+ rdev->pm.req_vblank |= (1 << 0);
+ drm_vblank_get(rdev->ddev, 0);
+ }
+ if (rdev->pm.active_crtcs & (1 << 1)) {
+ rdev->pm.req_vblank |= (1 << 1);
+ drm_vblank_get(rdev->ddev, 1);
+ }
+ if (rdev->pm.active_crtcs)
+ wait_event_interruptible_timeout(
+ rdev->irq.vblank_queue, 0,
+ msecs_to_jiffies(RADEON_WAIT_VBLANK_TIMEOUT));
+ if (rdev->pm.req_vblank & (1 << 0)) {
+ rdev->pm.req_vblank &= ~(1 << 0);
+ drm_vblank_put(rdev->ddev, 0);
+ }
+ if (rdev->pm.req_vblank & (1 << 1)) {
+ rdev->pm.req_vblank &= ~(1 << 1);
+ drm_vblank_put(rdev->ddev, 1);
+ }
+
+ radeon_pm_set_clocks_locked(rdev);
+ mutex_unlock(&rdev->cp.mutex);
}
static void radeon_pm_idle_work_handler(struct work_struct *work)
@@ -378,8 +361,7 @@
pm.idle_work.work);
mutex_lock(&rdev->pm.mutex);
- if (rdev->pm.state == PM_STATE_ACTIVE &&
- !rdev->pm.vblank_callback) {
+ if (rdev->pm.state == PM_STATE_ACTIVE) {
unsigned long irq_flags;
int not_processed = 0;
@@ -417,17 +399,8 @@
}
if (rdev->pm.planned_action != PM_ACTION_NONE &&
- jiffies > rdev->pm.action_timeout) {
- if (rdev->pm.active_crtcs & (1 << 0)) {
- rdev->pm.req_vblank |= (1 << 0);
- drm_vblank_get(rdev->ddev, 0);
- }
- if (rdev->pm.active_crtcs & (1 << 1)) {
- rdev->pm.req_vblank |= (1 << 1);
- drm_vblank_get(rdev->ddev, 1);
- }
- radeon_get_power_state(rdev, rdev->pm.planned_action);
- rdev->pm.vblank_callback = true;
+ jiffies > rdev->pm.action_timeout) {
+ radeon_pm_set_clocks(rdev);
}
}
mutex_unlock(&rdev->pm.mutex);