disp: msm: sde: trigger tx_wait if panel resolution switch

Trigger tx_wait if command mode panel resolution
switches during mode switch to avoid early single buffer
tear check programming.

Change-Id: Ib747df8250c714248a44b596c2c8aeef006ea4fc
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>

msm/sde/sde_encoder.c

@@ -2439,17 +2439,33 @@ static void _sde_encoder_virt_populate_hw_res(struct drm_encoder *drm_enc)
 }
 
 static int sde_encoder_virt_modeset_rc(struct drm_encoder *drm_enc,
-		struct msm_display_mode *msm_mode, bool pre_modeset)
+      struct drm_display_mode *adj_mode, struct msm_display_mode *msm_mode, bool pre_modeset)
 {
 	struct sde_encoder_virt *sde_enc = to_sde_encoder_virt(drm_enc);
 	enum sde_intf_mode intf_mode;
+	struct drm_display_mode *old_adj_mode = NULL;
 	int ret;
-	bool is_cmd_mode = false;
+	bool is_cmd_mode = false, res_switch = false;
 
 	if (sde_encoder_check_curr_mode(drm_enc, MSM_DISPLAY_CMD_MODE))
 		is_cmd_mode = true;
 
 	if (pre_modeset) {
+		if (sde_enc->cur_master)
+			old_adj_mode = &sde_enc->cur_master->cached_mode;
+		if (old_adj_mode && is_cmd_mode)
+			res_switch = !drm_mode_match(old_adj_mode, adj_mode, DRM_MODE_MATCH_TIMINGS);
+
+		if (res_switch) {
+			/* avoid early tear check reconfigure for resolution switch */
+			ret = sde_encoder_wait_for_event(drm_enc, MSM_ENC_TX_COMPLETE);
+			if (ret && ret != -EWOULDBLOCK) {
+				SDE_ERROR_ENC(sde_enc, "wait for idle failed %d\n", ret);
+				SDE_EVT32(DRMID(drm_enc), ret, SDE_EVTLOG_ERROR);
+				return ret;
+			}
+		}
+
 		intf_mode = sde_encoder_get_intf_mode(drm_enc);
 		if (msm_is_mode_seamless_dms(msm_mode) ||
 				(msm_is_mode_seamless_dyn_clk(msm_mode) &&
@@ -2554,7 +2570,7 @@ static void sde_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 
 	/* release resources before seamless mode change */
 	msm_mode = &c_state->msm_mode;
-	ret = sde_encoder_virt_modeset_rc(drm_enc, msm_mode, true);
+	ret = sde_encoder_virt_modeset_rc(drm_enc, adj_mode, msm_mode, true);
 	if (ret)
 		return;
 
@@ -2593,7 +2609,7 @@ static void sde_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 	}
 
 	/* update resources after seamless mode change */
-	sde_encoder_virt_modeset_rc(drm_enc, msm_mode, false);
+	sde_encoder_virt_modeset_rc(drm_enc, adj_mode, msm_mode, false);
 }
 
 void sde_encoder_control_te(struct drm_encoder *drm_enc, bool enable)