drm/amd/powerplay: Tidy up vega10_fan_ctrl_set_fan_speed_rpm()

Signed-off-by: NTom St Denis <tom.stdenis@amd.com>
Reviewed-by: NRex Zhu <Rex.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c

@@ -343,9 +343,9 @@ int vega10_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed)
 		reg = soc15_get_register_offset(THM_HWID, 0,
 				mmCG_TACH_STATUS_BASE_IDX, mmCG_TACH_STATUS);
 		cgs_write_register(hwmgr->device, reg,
-				(cgs_read_register(hwmgr->device, reg) &
-				~CG_TACH_STATUS__TACH_PERIOD_MASK) |
-				(tach_period << CG_TACH_STATUS__TACH_PERIOD__SHIFT));
+				CGS_REG_SET_FIELD(cgs_read_register(hwmgr->device, reg),
+					CG_TACH_STATUS, TACH_PERIOD,
+					tach_period));
 	}
 	return vega10_fan_ctrl_set_static_mode(hwmgr, FDO_PWM_MODE_STATIC_RPM);
 }