Add Macro and remove redundant sleep

sonic_platform_base/sonic_xcvr/api/public/cmis.py

@@ -1077,29 +1077,28 @@ def set_lpmode(self, lpmode):
         if self.is_flat_memory() or not self.get_lpmode_support():
             return False
 
+        DELAY_RETRY = 0.1
         lpmode_val = self.xcvr_eeprom.read(consts.MODULE_LEVEL_CONTROL)
         if lpmode_val is not None:
             if lpmode is True:
                 # Force module transition to LowPwr under SW control
                 lpmode_val = lpmode_val | (1 << CmisApi.LowPwrRequestSW)
                 self.xcvr_eeprom.write(consts.MODULE_LEVEL_CONTROL, lpmode_val)
-                time.sleep(0.1)
                 start_time = time.time()
                 pwroff_duration = self.get_module_pwr_down_duration()/1000
                 # Loop until the power-off duration has elapsed
                 while (time.time() - start_time) < pwroff_duration:
                     if self.get_lpmode():
                         return self.get_lpmode()
                     # Sleep for a short interval before the next check
-                    time.sleep(0.1)
+                    time.sleep(DELAY_RETRY)
                 return self.get_lpmode()
             else:
                 # Force transition from LowPwr to HighPower state under SW control.
                 # This will transition LowPwrS signal to False. (see Table 6-12 CMIS v5.0)
                 lpmode_val = lpmode_val & ~(1 << CmisApi.LowPwrRequestSW)
                 lpmode_val = lpmode_val & ~(1 << CmisApi.LowPwrAllowRequestHW)
                 self.xcvr_eeprom.write(consts.MODULE_LEVEL_CONTROL, lpmode_val)
-                time.sleep(1)
                 start_time = time.time()
                 # Loop until the power-on duration has elapsed
                 pwron_duration = self.get_module_pwr_up_duration()/1000
@@ -1108,7 +1107,7 @@ def set_lpmode(self, lpmode):
                     if mstate == 'ModuleReady':
                         return True
                     # Sleep for a short interval before the next check
-                    time.sleep(0.1)
+                    time.sleep(DELAY_RETRY)
         return False
 
     def get_loopback_capability(self):