drm/amd/display: Fix a regression on Polaris cards

DCE products don't define a `remove_stream_from_ctx` like DCN ones
do. This means that when compute_mst_dsc_configs_for_state() is called
it always returns -EINVAL which causes MST to fail to setup.

Cc: [email protected] # 6.4.y
Cc: Harry Wentland <[email protected]>
Reported-by: [email protected]
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/2671
Fixes: efa4c4d ("drm/amd/display: call remove_stream_from_ctx from res_pool funcs")
Signed-off-by: Mario Limonciello <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: superm1

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

@@ -1320,7 +1320,7 @@ int compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
 		if (computed_streams[i])
 			continue;
 
-		if (!res_pool->funcs->remove_stream_from_ctx ||
+		if (res_pool->funcs->remove_stream_from_ctx &&
 		    res_pool->funcs->remove_stream_from_ctx(stream->ctx->dc, dc_state, stream) != DC_OK)
 			return -EINVAL;