drm/amd/display: fix a pipe mapping error in dcn32_fpu

[why]
In dcn32 DML pipes are ordered the same as dc pipes but only for used
pipes. For example, if dc pipe 1 and 2 are used, their dml pipe indices
would be 0 and 1 respectively. However
update_pipe_slice_table_with_split_flags doesn't skip indices for free
pipes. This causes us to not reference correct dml pipe output when
building pipe topology.

[how]
Use two variables to iterate dc and dml pipes respectively and only
increment dml pipe index when current dc pipe is not free.

Cc: stable@vger.kernel.org # 6.1+
Reviewed-by: Chaitanya Dhere <chaitanya.dhere@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1192,13 +1192,16 @@ static bool update_pipe_slice_table_with_split_flags(
 	 */
 	struct pipe_ctx *pipe;
 	bool odm;
-	int i;
+	int dc_pipe_idx, dml_pipe_idx = 0;
 	bool updated = false;
 
-	for (i = 0; i < dc->res_pool->pipe_count; i++) {
-		pipe = &context->res_ctx.pipe_ctx[i];
+	for (dc_pipe_idx = 0;
+			dc_pipe_idx < dc->res_pool->pipe_count; dc_pipe_idx++) {
+		pipe = &context->res_ctx.pipe_ctx[dc_pipe_idx];
+		if (resource_is_pipe_type(pipe, FREE_PIPE))
+			continue;
 
-		if (merge[i]) {
+		if (merge[dc_pipe_idx]) {
 			if (resource_is_pipe_type(pipe, OPP_HEAD))
 				/* merging OPP head means reducing ODM slice
 				 * count by 1
@@ -1213,17 +1216,18 @@ static bool update_pipe_slice_table_with_split_flags(
 			updated = true;
 		}
 
-		if (split[i]) {
-			odm = vba->ODMCombineEnabled[vba->pipe_plane[i]] !=
+		if (split[dc_pipe_idx]) {
+			odm = vba->ODMCombineEnabled[vba->pipe_plane[dml_pipe_idx]] !=
 					dm_odm_combine_mode_disabled;
 			if (odm && resource_is_pipe_type(pipe, OPP_HEAD))
 				update_slice_table_for_stream(
-						table, pipe->stream, split[i] - 1);
+						table, pipe->stream, split[dc_pipe_idx] - 1);
 			else if (!odm && resource_is_pipe_type(pipe, DPP_PIPE))
 				update_slice_table_for_plane(table, pipe,
-						pipe->plane_state, split[i] - 1);
+						pipe->plane_state, split[dc_pipe_idx] - 1);
 			updated = true;
 		}
+		dml_pipe_idx++;
 	}
 	return updated;
 }