drm/amdgpu: Add 4k resolution for virtual display

Add 4k resolution for virtual connector.
Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/dce_virtual.c

@@ -286,7 +286,7 @@ static int dce_virtual_get_modes(struct drm_connector *connector)
 	static const struct mode_size {
 		int w;
 		int h;
-	} common_modes[17] = {
+	} common_modes[21] = {
 		{ 640,  480},
 		{ 720,  480},
 		{ 800,  600},
@@ -303,10 +303,14 @@ static int dce_virtual_get_modes(struct drm_connector *connector)
 		{1680, 1050},
 		{1600, 1200},
 		{1920, 1080},
-		{1920, 1200}
+		{1920, 1200},
+		{4096, 3112},
+		{3656, 2664},
+		{3840, 2160},
+		{4096, 2160},
 	};
 
-	for (i = 0; i < 17; i++) {
+	for (i = 0; i < 21; i++) {
 		mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h, 60, false, false, false);
 		drm_mode_probed_add(connector, mode);
 	}