drm/amdgpu/gmc: add proper CG flags for fiji

We were already enabling these CG features, this uses
the standard interface for doing so.
Acked-by: Tom St Denis <tom.stdenis@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c

@@ -1314,7 +1314,7 @@ static void fiji_update_mc_medium_grain_clock_gating(struct amdgpu_device *adev,
 {
 	uint32_t data;
 
-	if (enable) {
+	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_MC_MGCG)) {
 		data = RREG32(mmMC_HUB_MISC_HUB_CG);
 		data |= MC_HUB_MISC_HUB_CG__ENABLE_MASK;
 		WREG32(mmMC_HUB_MISC_HUB_CG, data);
@@ -1394,7 +1394,7 @@ static void fiji_update_mc_light_sleep(struct amdgpu_device *adev,
 {
 	uint32_t data;
 
-	if (enable) {
+	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_MC_LS)) {
 		data = RREG32(mmMC_HUB_MISC_HUB_CG);
 		data |= MC_HUB_MISC_HUB_CG__MEM_LS_ENABLE_MASK;
 		WREG32(mmMC_HUB_MISC_HUB_CG, data);

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

@@ -1089,7 +1089,9 @@ static int vi_common_early_init(void *handle)
 			AMD_CG_SUPPORT_BIF_LS |
 			AMD_CG_SUPPORT_HDP_MGCG |
 			AMD_CG_SUPPORT_HDP_LS |
-			AMD_CG_SUPPORT_ROM_MGCG;
+			AMD_CG_SUPPORT_ROM_MGCG |
+			AMD_CG_SUPPORT_MC_MGCG |
+			AMD_CG_SUPPORT_MC_LS;
 		adev->pg_flags = 0;
 		adev->external_rev_id = adev->rev_id + 0x3c;
 		break;