drm/powerplay: Add smu set xgmi pstate interface

XGMI pstate is controlled by SMU, driver need this interface to communicate
with SMU
Signed-off-by: shaoyunl <shaoyun.liu@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h

@@ -540,6 +540,8 @@ struct smu_funcs
 	int (*get_fan_speed_percent)(struct smu_context *smu, uint32_t *speed);
 	int (*set_fan_speed_percent)(struct smu_context *smu, uint32_t speed);
 	int (*set_fan_speed_rpm)(struct smu_context *smu, uint32_t speed);
+	int (*set_xgmi_pstate)(struct smu_context *smu, uint32_t pstate);
+
 };
 
 #define smu_init_microcode(smu) \
@@ -723,6 +725,8 @@ struct smu_funcs
 	((smu)->funcs->get_sclk ? (smu)->funcs->get_sclk((smu), (low)) : 0)
 #define smu_get_mclk(smu, low) \
 	((smu)->funcs->get_mclk ? (smu)->funcs->get_mclk((smu), (low)) : 0)
+#define smu_set_xgmi_pstate(smu, pstate) \
+		((smu)->funcs->set_xgmi_pstate ? (smu)->funcs->set_xgmi_pstate((smu), (pstate)) : 0)
 
 
 extern int smu_get_atom_data_table(struct smu_context *smu, uint32_t table,

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -1893,6 +1893,13 @@ static int smu_v11_0_set_fan_speed_rpm(struct smu_context *smu,
 	return ret;
 }
 
+static int smu_v11_0_set_xgmi_pstate(struct smu_context *smu,
+				     uint32_t pstate)
+{
+	/* send msg to SMU to set pstate */
+	return 0;
+}
+
 static const struct smu_funcs smu_v11_0_funcs = {
 	.init_microcode = smu_v11_0_init_microcode,
 	.load_microcode = smu_v11_0_load_microcode,
@@ -1947,6 +1954,7 @@ static const struct smu_funcs smu_v11_0_funcs = {
 	.get_fan_speed_percent = smu_v11_0_get_fan_speed_percent,
 	.set_fan_speed_percent = smu_v11_0_set_fan_speed_percent,
 	.set_fan_speed_rpm = smu_v11_0_set_fan_speed_rpm,
+	.set_xgmi_pstate = smu_v11_0_set_xgmi_pstate,
 };
 
 void smu_v11_0_set_smu_funcs(struct smu_context *smu)
@@ -1954,7 +1962,6 @@ void smu_v11_0_set_smu_funcs(struct smu_context *smu)
 	struct amdgpu_device *adev = smu->adev;
 
 	smu->funcs = &smu_v11_0_funcs;
-
 	switch (adev->asic_type) {
 	case CHIP_VEGA20:
 		vega20_set_ppt_funcs(smu);