[PATCH] drm/msm: rework vblank event handling in dpu_crtc

[Rajesh Yadav]

The vblank on/off calls were missing in dpu_crtc
leading to "driver forgot to call drm_crtc_vblank_off()"
warning while entering suspend state.
Also handle the state update completion event for
a crtc being disabled in current atomic commit.

This patch depends on https://www.spinics.net/lists/dri-devel/msg182402.html

Signed-off-by: Rajesh Yadav <ryadav at codeaurora.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index d171282..24715e4 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1617,6 +1617,7 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
 	struct drm_encoder *encoder;
 	struct msm_drm_private *priv;
 	int ret;
+	unsigned long flags;
 
 	if (!crtc || !crtc->dev || !crtc->dev->dev_private || !crtc->state) {
 		DPU_ERROR("invalid crtc\n");
@@ -1632,6 +1633,9 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
 	if (dpu_kms_is_suspend_state(crtc->dev))
 		_dpu_crtc_set_suspend(crtc, true);
 
+	/* Disable/save vblank irq handling */
+	drm_crtc_vblank_off(crtc);
+
 	mutex_lock(&dpu_crtc->crtc_lock);
 
 	/* wait for frame_event_done completion */
@@ -1669,7 +1673,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
 		dpu_power_handle_unregister_event(dpu_crtc->phandle,
 				dpu_crtc->power_event);
 
-
 	memset(dpu_crtc->mixers, 0, sizeof(dpu_crtc->mixers));
 	dpu_crtc->num_mixers = 0;
 	dpu_crtc->mixers_swapped = false;
@@ -1679,6 +1682,13 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
 	cstate->bw_split_vote = false;
 
 	mutex_unlock(&dpu_crtc->crtc_lock);
+
+	if (crtc->state->event && !crtc->state->active) {
+		spin_lock_irqsave(&crtc->dev->event_lock, flags);
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		crtc->state->event = NULL;
+		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+	}
 }
 
 static void dpu_crtc_enable(struct drm_crtc *crtc,
@@ -1718,6 +1728,9 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
 
 	mutex_unlock(&dpu_crtc->crtc_lock);
 
+	/* Enable/restore vblank irq handling */
+	drm_crtc_vblank_on(crtc);
+
 	dpu_crtc->power_event = dpu_power_handle_register_event(
 		dpu_crtc->phandle,
 		DPU_POWER_EVENT_POST_ENABLE | DPU_POWER_EVENT_POST_DISABLE |
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project