[PATCH v3 2/5] drm/msm/dpu: use system wq for vblank events

[Jeykumar Sankaran <jsanka@xxxxxxxxxxxxxx>]

DPU was using one thread per display to dispatch async commits and
vblank requests. Since clean up already happened in msm to use the
common thread for all the display commits, display threads are only
used to cater vblank requests. Since a single thread is sufficient
to do the job without any performance hits, use system workqueue
to queue requests. A separate patch is submitted later in this
series to remove the display threads altogether.

changes in v2:
	- switch to system wq before removing disp threads (Sean Paul)
changes in v3:
	- none

Signed-off-by: Jeykumar Sankaran <jsanka@xxxxxxxxxxxxxx>
---
 drivers/gpu/drm/msm/msm_drv.c | 9 ++++-----
 drivers/gpu/drm/msm/msm_drv.h | 2 +-
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 1ab9ead..90447f3 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -209,7 +209,7 @@ struct vblank_event {
 	bool enable;
 };
 
-static void vblank_ctrl_worker(struct kthread_work *work)
+static void vblank_ctrl_worker(struct work_struct *work)
 {
 	struct msm_vblank_ctrl *vbl_ctrl = container_of(work,
 						struct msm_vblank_ctrl, work);
@@ -257,8 +257,7 @@ static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
 	list_add_tail(&vbl_ev->node, &vbl_ctrl->event_list);
 	spin_unlock_irqrestore(&vbl_ctrl->lock, flags);
 
-	kthread_queue_work(&priv->disp_thread[crtc_id].worker,
-			&vbl_ctrl->work);
+	schedule_work(&vbl_ctrl->work);
 
 	return 0;
 }
@@ -278,7 +277,7 @@ static int msm_drm_uninit(struct device *dev)
 	 * work before drm_irq_uninstall() to avoid work re-enabling an
 	 * irq after uninstall has disabled it.
 	 */
-	kthread_flush_work(&vbl_ctrl->work);
+	flush_work(&vbl_ctrl->work);
 	list_for_each_entry_safe(vbl_ev, tmp, &vbl_ctrl->event_list, node) {
 		list_del(&vbl_ev->node);
 		kfree(vbl_ev);
@@ -476,7 +475,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 
 	INIT_LIST_HEAD(&priv->inactive_list);
 	INIT_LIST_HEAD(&priv->vblank_ctrl.event_list);
-	kthread_init_work(&priv->vblank_ctrl.work, vblank_ctrl_worker);
+	INIT_WORK(&priv->vblank_ctrl.work, vblank_ctrl_worker);
 	spin_lock_init(&priv->vblank_ctrl.lock);
 
 	drm_mode_config_init(ddev);
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 9d11f32..126345c4 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -78,7 +78,7 @@ enum msm_mdp_plane_property {
 };
 
 struct msm_vblank_ctrl {
-	struct kthread_work work;
+	struct work_struct work;
 	struct list_head event_list;
 	spinlock_t lock;
 };
-- 
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