drm/amd/pm: Hide irrelevant pm device attributes

Change return code to EOPNOTSUPP for unsupported functions. Use the
error code information to hide sysfs nodes not valid for the SOC.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/amdgpu_dpm.c

@@ -491,7 +491,7 @@ int amdgpu_dpm_read_sensor(struct amdgpu_device *adev, enum amd_pp_sensors senso
 int amdgpu_dpm_get_apu_thermal_limit(struct amdgpu_device *adev, uint32_t *limit)
 {
 	const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
-	int ret = -EINVAL;
+	int ret = -EOPNOTSUPP;
 
 	if (pp_funcs && pp_funcs->get_apu_thermal_limit) {
 		mutex_lock(&adev->pm.mutex);
@@ -505,7 +505,7 @@ int amdgpu_dpm_get_apu_thermal_limit(struct amdgpu_device *adev, uint32_t *limit
 int amdgpu_dpm_set_apu_thermal_limit(struct amdgpu_device *adev, uint32_t limit)
 {
 	const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
-	int ret = -EINVAL;
+	int ret = -EOPNOTSUPP;
 
 	if (pp_funcs && pp_funcs->set_apu_thermal_limit) {
 		mutex_lock(&adev->pm.mutex);
@@ -1182,7 +1182,7 @@ int amdgpu_dpm_get_sclk_od(struct amdgpu_device *adev)
 	int ret = 0;
 
 	if (!pp_funcs->get_sclk_od)
-		return 0;
+		return -EOPNOTSUPP;
 
 	mutex_lock(&adev->pm.mutex);
 	ret = pp_funcs->get_sclk_od(adev->powerplay.pp_handle);
@@ -1196,7 +1196,7 @@ int amdgpu_dpm_set_sclk_od(struct amdgpu_device *adev, uint32_t value)
 	const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
 
 	if (is_support_sw_smu(adev))
-		return 0;
+		return -EOPNOTSUPP;
 
 	mutex_lock(&adev->pm.mutex);
 	if (pp_funcs->set_sclk_od)
@@ -1219,7 +1219,7 @@ int amdgpu_dpm_get_mclk_od(struct amdgpu_device *adev)
 	int ret = 0;
 
 	if (!pp_funcs->get_mclk_od)
-		return 0;
+		return -EOPNOTSUPP;
 
 	mutex_lock(&adev->pm.mutex);
 	ret = pp_funcs->get_mclk_od(adev->powerplay.pp_handle);
@@ -1233,7 +1233,7 @@ int amdgpu_dpm_set_mclk_od(struct amdgpu_device *adev, uint32_t value)
 	const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
 
 	if (is_support_sw_smu(adev))
-		return 0;
+		return -EOPNOTSUPP;
 
 	mutex_lock(&adev->pm.mutex);
 	if (pp_funcs->set_mclk_od)

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

@@ -2197,6 +2197,18 @@ static int default_attr_update(struct amdgpu_device *adev, struct amdgpu_device_
 	} else if (DEVICE_ATTR_IS(xgmi_plpd_policy)) {
 		if (amdgpu_dpm_get_xgmi_plpd_mode(adev, NULL) == XGMI_PLPD_NONE)
 			*states = ATTR_STATE_UNSUPPORTED;
+	} else if (DEVICE_ATTR_IS(pp_dpm_mclk_od)) {
+		if (amdgpu_dpm_get_mclk_od(adev) == -EOPNOTSUPP)
+			*states = ATTR_STATE_UNSUPPORTED;
+	} else if (DEVICE_ATTR_IS(pp_dpm_sclk_od)) {
+		if (amdgpu_dpm_get_sclk_od(adev) == -EOPNOTSUPP)
+			*states = ATTR_STATE_UNSUPPORTED;
+	} else if (DEVICE_ATTR_IS(apu_thermal_cap)) {
+		u32 limit;
+
+		if (amdgpu_dpm_get_apu_thermal_limit(adev, &limit) ==
+		    -EOPNOTSUPP)
+			*states = ATTR_STATE_UNSUPPORTED;
 	}
 
 	switch (gc_ver) {

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

@@ -2747,7 +2747,7 @@ static int smu_read_sensor(void *handle,
 
 static int smu_get_apu_thermal_limit(void *handle, uint32_t *limit)
 {
-	int ret = -EINVAL;
+	int ret = -EOPNOTSUPP;
 	struct smu_context *smu = handle;
 
 	if (smu->ppt_funcs && smu->ppt_funcs->get_apu_thermal_limit)
@@ -2758,7 +2758,7 @@ static int smu_get_apu_thermal_limit(void *handle, uint32_t *limit)
 
 static int smu_set_apu_thermal_limit(void *handle, uint32_t limit)
 {
-	int ret = -EINVAL;
+	int ret = -EOPNOTSUPP;
 	struct smu_context *smu = handle;
 
 	if (smu->ppt_funcs && smu->ppt_funcs->set_apu_thermal_limit)