drm/amdgpu: Enable SDMA MGCG for Vangogh

Add flags AMD_CG_SUPPORT_SDMA_MGCG for Vangogh.
Start to open sdma mgcg from firmware version 70.
Signed-off-by: NJinzhou Su <Jinzhou.Su@amd.com>
Reviewed-by: NHuang Rui <ray.huang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -1118,6 +1118,7 @@ static int nv_common_early_init(void *handle)
 			AMD_CG_SUPPORT_MC_LS |
 			AMD_CG_SUPPORT_GFX_FGCG |
 			AMD_CG_SUPPORT_VCN_MGCG |
+			AMD_CG_SUPPORT_SDMA_MGCG |
 			AMD_CG_SUPPORT_JPEG_MGCG;
 		adev->pg_flags = AMD_PG_SUPPORT_GFX_PG |
 			AMD_PG_SUPPORT_VCN |

drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c

@@ -1556,6 +1556,10 @@ static void sdma_v5_2_update_medium_grain_clock_gating(struct amdgpu_device *ade
 	int i;
 
 	for (i = 0; i < adev->sdma.num_instances; i++) {
+
+		if (adev->sdma.instance[i].fw_version < 70 && adev->asic_type == CHIP_VANGOGH)
+			adev->cg_flags &= ~AMD_CG_SUPPORT_SDMA_MGCG;
+
 		if (enable && (adev->cg_flags & AMD_CG_SUPPORT_SDMA_MGCG)) {
 			/* Enable sdma clock gating */
 			def = data = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CLK_CTRL));