[PATCH v14 13/14] drm/msm/disp/dpu: update dpu_enc crtc state on crtc enable/disable during self refresh

[Vinod Polimera]

Populate the enocder software structure to reflect the updated
crtc appropriately during crtc enable/disable for a new commit
while taking care of the self refresh transitions when crtc
disable is triggered from the drm self refresh library.

Signed-off-by: Vinod Polimera <quic_vpolimer at quicinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 60e5984..b1ec0c3 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1022,8 +1022,17 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
 
 	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
 
-	if (old_crtc_state->self_refresh_active)
+	/* If disable is triggered while in self refresh mode,
+	 * reset the encoder software state so that in enable
+	 * it won't trigger a warn while assigning crtc.
+	 */
+	if (old_crtc_state->self_refresh_active) {
+		drm_for_each_encoder_mask(encoder, crtc->dev,
+					old_crtc_state->encoder_mask) {
+			dpu_encoder_assign_crtc(encoder, NULL);
+		}
 		return;
+	}
 
 	/* Disable/save vblank irq handling */
 	drm_crtc_vblank_off(crtc);
@@ -1036,7 +1045,14 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
 		 */
 		if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
 			release_bandwidth = true;
-		dpu_encoder_assign_crtc(encoder, NULL);
+
+		/*
+		 * If disable is triggered during psr active(e.g: screen dim in PSR),
+		 * we will need encoder->crtc connection to process the device sleep &
+		 * preserve it during psr sequence.
+		 */
+		if (!crtc->state->self_refresh_active)
+			dpu_encoder_assign_crtc(encoder, NULL);
 	}
 
 	/* wait for frame_event_done completion */
@@ -1084,6 +1100,9 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
 	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
 	struct drm_encoder *encoder;
 	bool request_bandwidth = false;
+	struct drm_crtc_state *old_crtc_state;
+
+	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
 
 	pm_runtime_get_sync(crtc->dev->dev);
 
@@ -1106,8 +1125,10 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
 	trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
 	dpu_crtc->enabled = true;
 
-	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
-		dpu_encoder_assign_crtc(encoder, crtc);
+	if (!old_crtc_state->self_refresh_active) {
+		drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
+			dpu_encoder_assign_crtc(encoder, crtc);
+	}
 
 	/* Enable/restore vblank irq handling */
 	drm_crtc_vblank_on(crtc);
-- 
2.7.4