drm/amd/display: Check context constructed for pipe split flags is still valid

[WHY?]
After applying pipesplit flags, DML can select a different configuration upon
revalidation, despite the desired one still being valid.

[HOW?]
Check the configuration is still has mode support, and apply it.
Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Dillon Varone <Dillon.Varone@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c

@@ -1748,6 +1748,9 @@ bool dcn32_internal_validate_bw(struct dc *dc,
 	}
 
 	if (repopulate_pipes) {
+		int flag_max_mpc_comb = vba->maxMpcComb;
+		int flag_vlevel = vlevel;
+
 		pipe_cnt = dc->res_pool->funcs->populate_dml_pipes(dc, context, pipes, fast_validate);
 
 		/* repopulate_pipes = 1 means the pipes were either split or merged. In this case
@@ -1761,6 +1764,22 @@ bool dcn32_internal_validate_bw(struct dc *dc,
 		if (vlevel == context->bw_ctx.dml.soc.num_states) {
 			/* failed after DET size changes */
 			goto validate_fail;
+		} else if (flag_max_mpc_comb == 0 &&
+				flag_max_mpc_comb != context->bw_ctx.dml.vba.maxMpcComb) {
+			/* check the context constructed with pipe split flags is still valid*/
+			bool flags_valid = false;
+			for (int i = flag_vlevel; i < context->bw_ctx.dml.soc.num_states; i++) {
+				if (vba->ModeSupport[i][flag_max_mpc_comb]) {
+					vba->maxMpcComb = flag_max_mpc_comb;
+					vba->VoltageLevel = i;
+					vlevel = i;
+					flags_valid = true;
+				}
+			}
+
+			/* this should never happen */
+			if (!flags_valid)
+				goto validate_fail;
 		}
 	}
 	*vlevel_out = vlevel;