drm/amdgpu: add get_clockgating callback for nbio v6.1

Signed-off-by: Huang Rui <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Reviewed-by: Edward O'Callaghan <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	{AMD_CG_SUPPORT_MC_MGCG, "Memory Controller Medium Grain Clock Gating"},
 	{AMD_CG_SUPPORT_SDMA_LS, "System Direct Memory Access Light Sleep"},
 	{AMD_CG_SUPPORT_SDMA_MGCG, "System Direct Memory Access Medium Grain Clock Gating"},
+	{AMD_CG_SUPPORT_BIF_MGCG, "Bus Interface Medium Grain Clock Gating"},
 	{AMD_CG_SUPPORT_BIF_LS, "Bus Interface Light Sleep"},
 	{AMD_CG_SUPPORT_UVD_MGCG, "Unified Video Decoder Medium Grain Clock Gating"},
 	{AMD_CG_SUPPORT_VCE_MGCG, "Video Compression Engine Medium Grain Clock Gating"},

drivers/gpu/drm/amd/amdgpu/nbio_v6_1.c

···
 		WREG32_PCIE(smnPCIE_CNTL2, data);
 }
 
+void nbio_v6_1_get_clockgating_state(struct amdgpu_device *adev, u32 *flags)
+{
+	int data;
+
+	/* AMD_CG_SUPPORT_BIF_MGCG */
+	data = RREG32_PCIE(smnCPM_CONTROL);
+	if (data & CPM_CONTROL__LCLK_DYN_GATE_ENABLE_MASK)
+		*flags |= AMD_CG_SUPPORT_BIF_MGCG;
+
+	/* AMD_CG_SUPPORT_BIF_LS */
+	data = RREG32_PCIE(smnPCIE_CNTL2);
+	if (data & PCIE_CNTL2__SLV_MEM_LS_EN_MASK)
+		*flags |= AMD_CG_SUPPORT_BIF_LS;
+}
+
 struct nbio_hdp_flush_reg nbio_v6_1_hdp_flush_reg;
 struct nbio_pcie_index_data nbio_v6_1_pcie_index_data;
 

drivers/gpu/drm/amd/amdgpu/nbio_v6_1.h

···
 u32 nbio_v6_1_get_rev_id(struct amdgpu_device *adev);
 void nbio_v6_1_update_medium_grain_clock_gating(struct amdgpu_device *adev, bool enable);
 void nbio_v6_1_update_medium_grain_light_sleep(struct amdgpu_device *adev, bool enable);
+void nbio_v6_1_get_clockgating_state(struct amdgpu_device *adev, u32 *flags);
 void nbio_v6_1_detect_hw_virt(struct amdgpu_device *adev);
 
 #endif