drm/amd/powerplay: implement sysfs of pp_cur_state function

add function of smu_get_currente_state for sw-smu.

v2: fix code typo error if (ret);
Signed-off-by: Kevin Wang <Kevin1.Wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -377,23 +377,29 @@ static ssize_t amdgpu_get_pp_cur_state(struct device *dev,
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct amdgpu_device *adev = ddev->dev_private;
 	struct pp_states_info data;
+	struct smu_context *smu = &adev->smu;
 	enum amd_pm_state_type pm = 0;
-	int i = 0;
+	int i = 0, ret = 0;
 
-	if (adev->powerplay.pp_funcs->get_current_power_state
+	if (is_support_sw_smu(adev)) {
+		pm = smu_get_current_power_state(smu);
+		ret = smu_get_power_num_states(smu, &data);
+		if (ret)
+			return ret;
+	} else if (adev->powerplay.pp_funcs->get_current_power_state
 		 && adev->powerplay.pp_funcs->get_pp_num_states) {
 		pm = amdgpu_dpm_get_current_power_state(adev);
 		amdgpu_dpm_get_pp_num_states(adev, &data);
+	}
 
-		for (i = 0; i < data.nums; i++) {
-			if (pm == data.states[i])
-				break;
-		}
-
-		if (i == data.nums)
-			i = -EINVAL;
+	for (i = 0; i < data.nums; i++) {
+		if (pm == data.states[i])
+			break;
 	}
 
+	if (i == data.nums)
+		i = -EINVAL;
+
 	return snprintf(buf, PAGE_SIZE, "%d\n", i);
 }
 

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

@@ -29,6 +29,12 @@
 #include "smu_v11_0.h"
 #include "atom.h"
 
+enum amd_pm_state_type smu_get_current_power_state(struct smu_context *smu)
+{
+	/* not support power state */
+	return POWER_STATE_TYPE_DEFAULT;
+}
+
 int smu_get_power_num_states(struct smu_context *smu,
 			     struct pp_states_info *state_info)
 {

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

@@ -382,5 +382,6 @@ int smu_common_read_sensor(struct smu_context *smu, enum amd_pp_sensors sensor,
 int smu_sys_get_pp_table(struct smu_context *smu, void **table);
 int smu_sys_set_pp_table(struct smu_context *smu,  void *buf, size_t size);
 int smu_get_power_num_states(struct smu_context *smu, struct pp_states_info *state_info);
+enum amd_pm_state_type smu_get_current_power_state(struct smu_context *smu);
 
 #endif