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Commit 2247818a authored by Anton Vorontsov's avatar Anton Vorontsov Committed by Greg Kroah-Hartman
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USB: fsl_qe_udc: Fix QE USB controller initialization 



qe_udc_reg_init() leaves the USB controller enabled before muram memory
initialized. Sometimes the uninitialized muram memory confuses the
controller, and it start sending the busy interrupts.

Fix this by disabling the controller, it will be enabled later by
the gadget driver, at bind time.

Signed-off-by: default avatarAnton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent a30551db

drivers/usb/gadget/fsl_qe_udc.c

+5 −1
Original line number Diff line number Diff line
@@ -2452,8 +2452,12 @@ static int __devinit qe_udc_reg_init(struct qe_udc *udc) 
	struct usb_ctlr __iomem *qe_usbregs;

	qe_usbregs = udc->usb_regs;



	/* Init the usb register */

	/* Spec says that we must enable the USB controller to change mode. */

	out_8(&qe_usbregs->usb_usmod, 0x01);

	/* Mode changed, now disable it, since muram isn't initialized yet. */

	out_8(&qe_usbregs->usb_usmod, 0x00);



	/* Initialize the rest. */

	out_be16(&qe_usbregs->usb_usbmr, 0);

	out_8(&qe_usbregs->usb_uscom, 0);

	out_be16(&qe_usbregs->usb_usber, USBER_ALL_CLEAR);