disp: msm: sde: avoid returning vsync count for cwb encoder

In CWB use case along with suspend commit, the function
drm_crtc_funcs.get_vblank_counter returns a zero vsync count
value. This causes blocking of drm_crtc_funcs.disable_vblank,
leading to a wait for vsync timeout while disabling the encoder.
hence clear a cwb encoder mask in encoder disable and set it
while performing mode set.

Change-Id: Ic994aa0a86faf48e2b25955cf6fe12166fe9d328
Signed-off-by: Akash Gajjar <[email protected]>

msm/sde/sde_encoder.c

@@ -3123,6 +3123,7 @@ static void sde_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 				sde_crtc_state->cached_cwb_enc_mask);
 		sde_crtc_state->cwb_enc_mask = sde_crtc_state->cached_cwb_enc_mask;
 		sde_encoder_set_clone_mode(drm_enc, crtc_state);
+		sde_crtc->cached_encoder_mask |= drm_encoder_mask(drm_enc);
 	}
 
 	/* reserve dynamic resources now, indicating non test-only */

msm/sde/sde_encoder_phys_wb.c

@@ -2063,6 +2063,8 @@ static bool _sde_encoder_phys_wb_is_idle(struct sde_encoder_phys *phys_enc)
 static void _sde_encoder_phys_wb_reset_state(struct sde_encoder_phys *phys_enc)
 {
 	struct sde_encoder_phys_wb *wb_enc = to_sde_encoder_phys_wb(phys_enc);
+	struct sde_encoder_virt *sde_enc = to_sde_encoder_virt(phys_enc->parent);
+	struct sde_crtc *sde_crtc;
 
 	phys_enc->enable_state = SDE_ENC_DISABLED;
 
@@ -2074,6 +2076,10 @@ static void _sde_encoder_phys_wb_reset_state(struct sde_encoder_phys *phys_enc)
 		wb_enc->wb_aspace = NULL;
 	}
 
+	sde_crtc = to_sde_crtc(sde_enc->crtc);
+	if (sde_crtc)
+		sde_crtc->cached_encoder_mask &= ~drm_encoder_mask(phys_enc->parent);
+
 	wb_enc->crtc = NULL;
 	phys_enc->hw_cdm = NULL;
 	phys_enc->hw_ctl = NULL;