drm/amdgpu/pp: switch smu callback type for get_argument()

return a uint32_t rather than an int to properly reflect
what the function does.
Reviewed-by: NRex Zhu <rezhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -194,7 +194,7 @@ struct pp_smumgr_func {
 	int (*request_smu_load_fw)(struct pp_hwmgr  *hwmgr);
 	int (*request_smu_load_specific_fw)(struct pp_hwmgr  *hwmgr,
 					    uint32_t firmware);
-	int (*get_argument)(struct pp_hwmgr  *hwmgr);
+	uint32_t (*get_argument)(struct pp_hwmgr  *hwmgr);
 	int (*send_msg_to_smc)(struct pp_hwmgr  *hwmgr, uint16_t msg);
 	int (*send_msg_to_smc_with_parameter)(struct pp_hwmgr  *hwmgr,
 					  uint16_t msg, uint32_t parameter);

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

@@ -80,7 +80,7 @@ enum SMU10_TABLE_ID {
 	SMU10_CLOCKTABLE,
 };
 
-extern int smum_get_argument(struct pp_hwmgr *hwmgr);
+extern uint32_t smum_get_argument(struct pp_hwmgr *hwmgr);
 
 extern int smum_download_powerplay_table(struct pp_hwmgr *hwmgr, void **table);
 

drivers/gpu/drm/amd/powerplay/smumgr/smu10_smumgr.c

@@ -68,7 +68,7 @@ static int smu10_send_msg_to_smc_without_waiting(struct pp_hwmgr *hwmgr,
 	return 0;
 }
 
-static int smu10_read_arg_from_smc(struct pp_hwmgr *hwmgr)
+static uint32_t smu10_read_arg_from_smc(struct pp_hwmgr *hwmgr)
 {
 	struct amdgpu_device *adev = hwmgr->adev;
 

drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c

@@ -52,10 +52,10 @@ static const enum smu8_scratch_entry firmware_list[] = {
 	SMU8_SCRATCH_ENTRY_UCODE_ID_RLC_G,
 };
 
-static int smu8_get_argument(struct pp_hwmgr *hwmgr)
+static uint32_t smu8_get_argument(struct pp_hwmgr *hwmgr)
 {
 	if (hwmgr == NULL || hwmgr->device == NULL)
-		return -EINVAL;
+		return 0;
 
 	return cgs_read_register(hwmgr->device,
 					mmSMU_MP1_SRBM2P_ARG_0);

drivers/gpu/drm/amd/powerplay/smumgr/smu9_smumgr.c

@@ -142,7 +142,7 @@ int smu9_send_msg_to_smc_with_parameter(struct pp_hwmgr *hwmgr,
 	return 0;
 }
 
-int smu9_get_argument(struct pp_hwmgr *hwmgr)
+uint32_t smu9_get_argument(struct pp_hwmgr *hwmgr)
 {
 	struct amdgpu_device *adev = hwmgr->adev;
 

drivers/gpu/drm/amd/powerplay/smumgr/smu9_smumgr.h

@@ -27,6 +27,6 @@ bool smu9_is_smc_ram_running(struct pp_hwmgr *hwmgr);
 int smu9_send_msg_to_smc(struct pp_hwmgr *hwmgr, uint16_t msg);
 int smu9_send_msg_to_smc_with_parameter(struct pp_hwmgr *hwmgr,
 					uint16_t msg, uint32_t parameter);
-int smu9_get_argument(struct pp_hwmgr *hwmgr);
+uint32_t smu9_get_argument(struct pp_hwmgr *hwmgr);
 
 #endif

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

@@ -96,7 +96,7 @@ int smum_process_firmware_header(struct pp_hwmgr *hwmgr)
 	return 0;
 }
 
-int smum_get_argument(struct pp_hwmgr *hwmgr)
+uint32_t smum_get_argument(struct pp_hwmgr *hwmgr)
 {
 	if (NULL != hwmgr->smumgr_funcs->get_argument)
 		return hwmgr->smumgr_funcs->get_argument(hwmgr);