Revert "drm/amd/display: Initialize writeback connector"

This reverts commit a2830b9.

[WHY & HOW]
The writeback series cause a regression in thunderbolt display.

Signed-off-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Alex Hung

drivers/gpu/drm/amd/display/amdgpu_dm/Makefile

@@ -37,8 +37,7 @@ AMDGPUDM = \
 	amdgpu_dm_helpers.o \
 	amdgpu_dm_pp_smu.o \
 	amdgpu_dm_psr.o \
-	amdgpu_dm_replay.o \
-	amdgpu_dm_wb.o
+	amdgpu_dm_replay.o
 
 ifdef CONFIG_DRM_AMD_DC_FP
 AMDGPUDM += dc_fpu.o

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

@@ -54,7 +54,6 @@
 #include "amdgpu_dm_crtc.h"
 #include "amdgpu_dm_hdcp.h"
 #include <drm/display/drm_hdcp_helper.h>
-#include "amdgpu_dm_wb.h"
 #include "amdgpu_pm.h"
 #include "amdgpu_atombios.h"
 
@@ -4472,25 +4471,8 @@ static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev)
 
 		link = dc_get_link_at_index(dm->dc, i);
 
-		if (link->connector_signal == SIGNAL_TYPE_VIRTUAL) {
-			struct drm_writeback_connector *wbcon = kzalloc(sizeof(*wbcon), GFP_KERNEL);
-
-			if (!wbcon) {
-				DRM_ERROR("KMS: Failed to allocate writeback connector\n");
-				continue;
-			}
-
-			if (amdgpu_dm_wb_connector_init(dm, wbcon)) {
-				DRM_ERROR("KMS: Failed to initialize writeback connector\n");
-				kfree(wbcon);
-				continue;
-			}
-
-			link->psr_settings.psr_feature_enabled = false;
-			link->psr_settings.psr_version = DC_PSR_VERSION_UNSUPPORTED;
-
+		if (link->connector_signal == SIGNAL_TYPE_VIRTUAL)
 			continue;
-		}
 
 		aconnector = kzalloc(sizeof(*aconnector), GFP_KERNEL);
 		if (!aconnector)