Commit c3b674a0 authored by Peter Chen's avatar Peter Chen
Browse files

usb: chipidea: vbus event may exist before starting gadget 



At some situations, the vbus may already be there before starting
gadget. So we need to check vbus event after switching to gadget in
order to handle missing vbus event. The typical use cases are plugging
vbus cable before driver load or the vbus has already been there
after stopping host but before starting gadget.

Signed-off-by: default avatarPeter Chen <peter.chen@nxp.com>
Tested-by: default avatarStephen Boyd <stephen.boyd@linaro.org>
Reported-by: default avatarStephen Boyd <stephen.boyd@linaro.org>
parent 5cc49268

drivers/usb/chipidea/otg.c

+12 −5
Original line number Diff line number Diff line
@@ -134,9 +134,9 @@ void ci_handle_vbus_change(struct ci_hdrc *ci) 
	if (!ci->is_otg)

		return;



	if (hw_read_otgsc(ci, OTGSC_BSV))

	if (hw_read_otgsc(ci, OTGSC_BSV) && !ci->vbus_active)

		usb_gadget_vbus_connect(&ci->gadget);

	else

	else if (!hw_read_otgsc(ci, OTGSC_BSV) && ci->vbus_active)

		usb_gadget_vbus_disconnect(&ci->gadget);

}
@@ -175,14 +175,21 @@ static void ci_handle_id_switch(struct ci_hdrc *ci) 


		ci_role_stop(ci);



		if (role == CI_ROLE_GADGET)

		if (role == CI_ROLE_GADGET &&

				IS_ERR(ci->platdata->vbus_extcon.edev))

			/*

			 * wait vbus lower than OTGSC_BSV before connecting

			 * to host

			 * Wait vbus lower than OTGSC_BSV before connecting

			 * to host. If connecting status is from an external

			 * connector instead of register, we don't need to

			 * care vbus on the board, since it will not affect

			 * external connector status.

			 */

			hw_wait_vbus_lower_bsv(ci);



		ci_role_start(ci, role);

		/* vbus change may have already occurred */

		if (role == CI_ROLE_GADGET)

			ci_handle_vbus_change(ci);

	}

}

/**

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