main: wait a few seconds before shutting down interfaces

The USB gadget may hang if we do not wait a few seconds between the power cut and the removal of the USB function (possibly because some power remains on the USB line for a few seconds). Signed-off-by: Cedric Hombourger <[email protected]>
siemens · Mar 5, 2022 · 7eb9d10 · 7eb9d10
1 parent 1db735e
commit 7eb9d10
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/mtda/main.py b/mtda/main.py
@@ -917,15 +917,23 @@ def _target_off(self, session=None):
         self.exec_power_off_script()
 
         result = True
+
+        # cut power and wait a few seconds before shutting down
+        # our interfaces (keyboard, console, USB gadget, etc.)
         if self.power_controller is not None:
             result = self.power_controller.off()
+            time.sleep(3)
+
+        # shutdown our gadgets
         if self.keyboard is not None:
             self.keyboard.idle()
         if self.console_logger is not None:
             self.console_logger.reset_timer()
             if result is True:
                 self.console_logger.pause()
         self._composite_stop()
+
+        # send power-off event to clients
         self._power_event(CONSTS.POWER.OFF)
 
         self.mtda.debug(3, "main._target_off(): {}".format(result))