drm/amd/display: Set mpcc_disconnect_pending during MPC reset

This prevents an issue where the MPCC will not go to idle due to us not
waiting for it to become idle during disable plane.

Signed-off-by: Andrew Jiang <Andrew.Jiang@amd.com>
Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c

@@ -42,15 +42,25 @@ void hubp1_set_blank(struct hubp *hubp, bool blank)
 {
 	struct dcn10_hubp *hubp1 = TO_DCN10_HUBP(hubp);
 	uint32_t blank_en = blank ? 1 : 0;
+	uint32_t reg_val = 0;
 
-	REG_UPDATE_2(DCHUBP_CNTL,
+	reg_val = REG_UPDATE_2(DCHUBP_CNTL,
 			HUBP_BLANK_EN, blank_en,
 			HUBP_TTU_DISABLE, blank_en);
 
 	if (blank) {
-		REG_WAIT(DCHUBP_CNTL,
-				HUBP_NO_OUTSTANDING_REQ, 1,
-				1, 200);
+		if (reg_val) {
+			/* init sequence workaround: in case HUBP is
+			 * power gated, this wait would timeout.
+			 *
+			 * we just wrote reg_val to non-0, if it stay 0
+			 * it means HUBP is gated
+			 */
+			REG_WAIT(DCHUBP_CNTL,
+					HUBP_NO_OUTSTANDING_REQ, 1,
+					1, 200);
+		}
+
 		hubp->mpcc_id = 0xf;
 		hubp->opp_id = 0xf;
 	}

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -782,8 +782,8 @@ static void dcn10_init_hw(struct dc *dc)
 		hubp->opp_id = 0xf;
 		hubp->power_gated = false;
 
-		if (hubp->opp_id != 0xf)
-			pipe_ctx->stream_res.opp = dc->res_pool->opps[hubp->opp_id];
+		dc->res_pool->opps[i]->mpcc_disconnect_pending[i] = true;
+		pipe_ctx->stream_res.opp = dc->res_pool->opps[i];
 
 		plane_atomic_disconnect(dc, pipe_ctx);
 	}