[SFP-Refactor] Fix LP mode API issue (sonic-net#247)

* [SFP-Refactor] Fix LP mode API issue

* update API

Author: aravindmani-1

sonic_platform_base/sonic_xcvr/api/public/cmis.py

@@ -898,11 +898,18 @@ def set_lpmode(self, lpmode):
         if lpmode_val is not None:
             if lpmode is True:
                 lpmode_val = lpmode_val | (1 << 4)
+                self.xcvr_eeprom.write(consts.MODULE_LEVEL_CONTROL, lpmode_val)
+                time.sleep(0.1)
+                return self.get_lpmode()
             else:
                 lpmode_val = lpmode_val & ~(1 << 4)
-            self.xcvr_eeprom.write(consts.MODULE_LEVEL_CONTROL, lpmode_val)
-            time.sleep(0.1)
-            return self.get_lpmode()
+                self.xcvr_eeprom.write(consts.MODULE_LEVEL_CONTROL, lpmode_val)
+                time.sleep(1)
+                lpmode = self.xcvr_eeprom.read(consts.TRANS_MODULE_STATUS_FIELD)
+                if lpmode is not None:
+                    if lpmode.get('ModuleState') == 'ModuleReady':
+                        return True
+                return False
         return False
 
     def get_loopback_capability(self):

sonic_platform_base/sonic_xcvr/sfp_optoe_base.py

@@ -144,7 +144,7 @@ def set_lpmode(self, lpmode):
         vendors has to implement accordingly.
         """
         api = self.get_xcvr_api()
-        return api.set_lp_mode(lpmode) if api is not None else None
+        return api.set_lpmode(lpmode) if api is not None else None
 
     def set_optoe_write_max(self, write_max):
         sys_path = self.get_eeprom_path()