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authorAnton Vorontsov <avorontsov@ru.mvista.com>2008-12-25 17:15:07 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2009-02-09 11:19:47 -0800
commit2247818a329687f30d1e5c3a62efc33d07c47522 (patch)
tree30ae140d233f6f84065e33d913f5ed675d3d88d9 /drivers/usb/gadget/fsl_qe_udc.c
parenta30551db66afa1b53a4fa7ceadddb7122bdcf491 (diff)
downloadop-kernel-dev-2247818a329687f30d1e5c3a62efc33d07c47522.zip
op-kernel-dev-2247818a329687f30d1e5c3a62efc33d07c47522.tar.gz
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 <avorontsov@ru.mvista.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/fsl_qe_udc.c')
-rw-r--r--drivers/usb/gadget/fsl_qe_udc.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c
index 064582f..1319f8f 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);
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