disp: msm: sde: enable vsync irq during sys cache read work

Currently, when doze mode is enabled the encoder off work
worker is started 1 ms after idle power collapse because of
aggressive idle-pc feature. This causes the system cache
worker to start after the clocks and vsync interrupt are disabled.

This change independently enables clocks and interrupts during
system cache work thread to decouple it from the encoder
off work sequence.

Change-Id: I8ed172b0e7c5c8e4e270e768434301d972e90eb9
Signed-off-by: Amine Najahi <[email protected]>

msm/sde/sde_crtc.c

@@ -7435,6 +7435,7 @@ void __sde_crtc_static_cache_read_work(struct kthread_work *work)
 	struct sde_hw_ctl *ctl = sde_crtc->mixers[0].hw_ctl;
 	struct drm_encoder *enc, *drm_enc = NULL;
 	struct drm_plane *plane;
+	struct sde_encoder_kickoff_params params = { 0 };
 
 	if (sde_crtc->cache_state != CACHE_STATE_FRAME_WRITE)
 		return;
@@ -7462,7 +7463,9 @@ void __sde_crtc_static_cache_read_work(struct kthread_work *work)
 	drm_atomic_crtc_for_each_plane(plane, crtc)
 		sde_plane_ctl_flush(plane, ctl, true);
 
-	/* kickoff encoder and wait for VBLANK */
+	/* Enable clocks and IRQ and wait for VBLANK */
+	params.affected_displays = _sde_crtc_get_displays_affected(crtc, crtc->state);
+	sde_encoder_prepare_for_kickoff(drm_enc, &params);
 	sde_encoder_kickoff(drm_enc, false);
 	sde_encoder_wait_for_event(drm_enc, MSM_ENC_VBLANK);
 
@@ -7500,6 +7503,8 @@ void sde_crtc_static_cache_read_kickoff(struct drm_crtc *crtc)
 	kthread_queue_delayed_work(&disp_thread->worker,
 			&sde_crtc->static_cache_read_work,
 			msecs_to_jiffies(msecs_fps));
+
+	SDE_EVT32(DRMID(crtc), sde_crtc->cache_state, msecs_fps);
 }
 
 void sde_crtc_cancel_delayed_work(struct drm_crtc *crtc)