drm/amd/amdgpu: add IH cg support on soc15 project

enable/disable IH clock gating on soc15 projects.

Signed-off-by: Kenneth Feng <[e-mail]>
Reviewed-by: Kevin Wang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/soc15.c

···
 			AMD_CG_SUPPORT_SDMA_MGCG |
 			AMD_CG_SUPPORT_SDMA_LS |
 			AMD_CG_SUPPORT_MC_MGCG |
-			AMD_CG_SUPPORT_MC_LS;
+			AMD_CG_SUPPORT_MC_LS |
+			AMD_CG_SUPPORT_IH_CG;
 		adev->pg_flags = 0;
 		adev->external_rev_id = adev->rev_id + 0x32;
 		break;

drivers/gpu/drm/amd/amdgpu/vega10_ih.c

···
 	return 0;
 }
 
+static void vega10_ih_update_clockgating_state(struct amdgpu_device *adev,
+					       bool enable)
+{
+	uint32_t data, def, field_val;
+
+	if (adev->cg_flags & AMD_CG_SUPPORT_IH_CG) {
+		def = data = RREG32_SOC15(OSSSYS, 0, mmIH_CLK_CTRL);
+		field_val = enable ? 0 : 1;
+		/**
+		 * Vega10 does not have IH_RETRY_INT_CAM_MEM_CLK_SOFT_OVERRIDE
+		 * and IH_BUFFER_MEM_CLK_SOFT_OVERRIDE field.
+		 */
+		if (adev->asic_type > CHIP_VEGA10) {
+			data = REG_SET_FIELD(data, IH_CLK_CTRL,
+				     IH_RETRY_INT_CAM_MEM_CLK_SOFT_OVERRIDE, field_val);
+			data = REG_SET_FIELD(data, IH_CLK_CTRL,
+				     IH_BUFFER_MEM_CLK_SOFT_OVERRIDE, field_val);
+		}
+
+		data = REG_SET_FIELD(data, IH_CLK_CTRL,
+				     DBUS_MUX_CLK_SOFT_OVERRIDE, field_val);
+		data = REG_SET_FIELD(data, IH_CLK_CTRL,
+				     OSSSYS_SHARE_CLK_SOFT_OVERRIDE, field_val);
+		data = REG_SET_FIELD(data, IH_CLK_CTRL,
+				     LIMIT_SMN_CLK_SOFT_OVERRIDE, field_val);
+		data = REG_SET_FIELD(data, IH_CLK_CTRL,
+				     DYN_CLK_SOFT_OVERRIDE, field_val);
+		data = REG_SET_FIELD(data, IH_CLK_CTRL,
+				     REG_CLK_SOFT_OVERRIDE, field_val);
+		if (def != data)
+			WREG32_SOC15(OSSSYS, 0, mmIH_CLK_CTRL, data);
+	}
+}
+
 static int vega10_ih_set_clockgating_state(void *handle,
 					  enum amd_clockgating_state state)
 {
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	vega10_ih_update_clockgating_state(adev,
+				state == AMD_CG_STATE_GATE ? true : false);
 	return 0;
+
 }
 
 static int vega10_ih_set_powergating_state(void *handle,

drivers/gpu/drm/amd/include/asic_reg/oss/osssys_4_0_sh_mask.h

···
 #define IH_STORM_CLIENT_LIST_CNTL__CLIENT30_IS_STORM_CLIENT_MASK                                              0x40000000L
 #define IH_STORM_CLIENT_LIST_CNTL__CLIENT31_IS_STORM_CLIENT_MASK                                              0x80000000L
 //IH_CLK_CTRL
+#define IH_CLK_CTRL__IH_RETRY_INT_CAM_MEM_CLK_SOFT_OVERRIDE__SHIFT                                             0x19
+#define IH_CLK_CTRL__IH_BUFFER_MEM_CLK_SOFT_OVERRIDE__SHIFT                                             		  0x1a
 #define IH_CLK_CTRL__DBUS_MUX_CLK_SOFT_OVERRIDE__SHIFT                                                        0x1b
 #define IH_CLK_CTRL__OSSSYS_SHARE_CLK_SOFT_OVERRIDE__SHIFT                                                    0x1c
 #define IH_CLK_CTRL__LIMIT_SMN_CLK_SOFT_OVERRIDE__SHIFT                                                       0x1d
 #define IH_CLK_CTRL__DYN_CLK_SOFT_OVERRIDE__SHIFT                                                             0x1e
 #define IH_CLK_CTRL__REG_CLK_SOFT_OVERRIDE__SHIFT                                                             0x1f
+#define IH_CLK_CTRL__IH_RETRY_INT_CAM_MEM_CLK_SOFT_OVERRIDE_MASK                                              0x02000000L
+#define IH_CLK_CTRL__IH_BUFFER_MEM_CLK_SOFT_OVERRIDE_MASK                                             		  0x04000000L
 #define IH_CLK_CTRL__DBUS_MUX_CLK_SOFT_OVERRIDE_MASK                                                          0x08000000L
 #define IH_CLK_CTRL__OSSSYS_SHARE_CLK_SOFT_OVERRIDE_MASK                                                      0x10000000L
 #define IH_CLK_CTRL__LIMIT_SMN_CLK_SOFT_OVERRIDE_MASK                                                         0x20000000L