drm/amdgpu: add initial GC 11.5.1 soc21 support

Disable clock gating and power gating for now.

v2: squash in revision fix (Alex)
Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc21.c

@@ -717,6 +717,11 @@ static int soc21_common_early_init(void *handle)
 			AMD_PG_SUPPORT_GFX_PG;
 		adev->external_rev_id = adev->rev_id + 0x1;
 		break;
+	case IP_VERSION(11, 5, 1):
+		adev->cg_flags = 0;
+		adev->pg_flags = 0;
+		adev->external_rev_id = adev->rev_id + 0xc1;
+		break;
 	default:
 		/* FIXME: not supported yet */
 		return -EINVAL;