drm/amdgpu/display: protect new DSC code with CONFIG_DRM_AMD_DC_DCN

Otherwise we get undefined symbols.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -4952,6 +4952,7 @@ const struct drm_encoder_helper_funcs amdgpu_dm_encoder_helper_funcs = {
 	.atomic_check = dm_encoder_helper_atomic_check
 };
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
 static int dm_update_mst_vcpi_slots_for_dsc(struct drm_atomic_state *state,
 					    struct dc_state *dc_state)
 {
@@ -5014,6 +5015,7 @@ static int dm_update_mst_vcpi_slots_for_dsc(struct drm_atomic_state *state,
 	}
 	return 0;
 }
+#endif
 
 static void dm_drm_plane_reset(struct drm_plane *plane)
 {
@@ -8149,12 +8151,14 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 		if (ret)
 			goto fail;
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
 		if (!compute_mst_dsc_configs_for_state(state, dm_state->context))
 			goto fail;
 
 		ret = dm_update_mst_vcpi_slots_for_dsc(state, dm_state->context);
 		if (ret)
 			goto fail;
+#endif
 
 		if (dc_validate_global_state(dc, dm_state->context, false) != DC_OK) {
 			ret = -EINVAL;

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

@@ -42,7 +42,9 @@
 #endif
 
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
 #include "dc/dcn20/dcn20_resource.h"
+#endif
 
 /* #define TRACE_DPCD */
 
@@ -185,6 +187,7 @@ static const struct drm_connector_funcs dm_dp_mst_connector_funcs = {
 	.early_unregister = amdgpu_dm_mst_connector_early_unregister,
 };
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
 static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnector)
 {
 	struct dc_sink *dc_sink = aconnector->dc_sink;
@@ -206,6 +209,7 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto
 
 	return true;
 }
+#endif
 
 static int dm_dp_mst_get_modes(struct drm_connector *connector)
 {
@@ -253,9 +257,11 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 			amdgpu_dm_update_freesync_caps(
 					connector, aconnector->edid);
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
 			if (!validate_dsc_caps_on_connector(aconnector))
 				memset(&aconnector->dc_sink->sink_dsc_caps,
 				       0, sizeof(aconnector->dc_sink->sink_dsc_caps));
+#endif
 		}
 	}
 
@@ -506,6 +512,8 @@ int dm_mst_get_pbn_divider(struct dc_link *link)
 			dc_link_get_link_cap(link)) / (8 * 1000 * 54);
 }
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
+
 struct dsc_mst_fairness_params {
 	struct dc_crtc_timing *timing;
 	struct dc_sink *sink;
@@ -874,3 +882,5 @@ bool compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
 
 	return true;
 }
+
+#endif

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

@@ -34,7 +34,9 @@ int dm_mst_get_pbn_divider(struct dc_link *link);
 void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
 				       struct amdgpu_dm_connector *aconnector);
 
-
+#if defined(CONFIG_DRM_AMD_DC_DCN)
 bool compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
 				       struct dc_state *dc_state);
 #endif
+
+#endif