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Commit cdd278f2 authored by Peter Chen's avatar Peter Chen Committed by Greg Kroah-Hartman
Browse files

usb: chipidea: add controller reset API 



Add controller reset API, currently it is used for device mode only.
It may be used for host/otg driver in future.

Ususally, we need this API for dual-role switch and back from hibernation
suspend to let the controller at default state.

Signed-off-by: default avatarPeter Chen <peter.chen@freescale.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 947c8859

drivers/usb/chipidea/core.c

+28 −4
Original line number Diff line number Diff line
@@ -384,6 +384,26 @@ static int ci_usb_phy_init(struct ci_hdrc *ci) 
	return ret;

}



/**

 * hw_controller_reset: do controller reset

 * @ci: the controller

  *

 * This function returns an error code

 */

static int hw_controller_reset(struct ci_hdrc *ci)

{

	int count = 0;



	hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);

	while (hw_read(ci, OP_USBCMD, USBCMD_RST)) {

		udelay(10);

		if (count++ > 1000)

			return -ETIMEDOUT;

	}



	return 0;

}



/**

 * hw_device_reset: resets chip (execute without interruption)

 * @ci: the controller
@@ -392,13 +412,17 @@ static int ci_usb_phy_init(struct ci_hdrc *ci) 
 */

int hw_device_reset(struct ci_hdrc *ci, u32 mode)

{

	int ret;



	/* should flush & stop before reset */

	hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);

	hw_write(ci, OP_USBCMD, USBCMD_RS, 0);



	hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);

	while (hw_read(ci, OP_USBCMD, USBCMD_RST))

		udelay(10);		/* not RTOS friendly */

	ret = hw_controller_reset(ci);

	if (ret) {

		dev_err(ci->dev, "error resetting controller, ret=%d\n", ret);

		return ret;

	}



	if (ci->platdata->notify_event)

		ci->platdata->notify_event(ci,