From: Anton Vorontsov Date: Thu, 25 Dec 2008 14:15:07 +0000 (+0300) Subject: USB: fsl_qe_udc: Fix QE USB controller initialization X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2247818a329687f30d1e5c3a62efc33d07c47522;p=linux-beck.git 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: Anton Vorontsov Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c index 064582fb6a87..1319f8f7acba 100644 --- a/drivers/usb/gadget/fsl_qe_udc.c +++ b/drivers/usb/gadget/fsl_qe_udc.c @@ -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);