For USB3.0 the max packetsize for GET_DESCRIPTOR should be sent as exponent value for 2. This means for 512, max packet size should be filled with 9(2^9=512). Also, fill the USB version field with 3.0 if speed is negotiated to Superspeed. This fixes the issue of DFU gadget download failure with superspeed. With out this patch, the max packet size is overflowed to zero as the bMaxPacketsize is of u8 and hence host is not able to detect this device.
Signed-off-by: Siva Durga Prasad Paladugu siva.durga.paladugu@xilinx.com --- drivers/usb/gadget/composite.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 5106cc5..c7e7623 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -735,8 +735,21 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) case USB_DT_DEVICE: cdev->desc.bNumConfigurations = count_configs(cdev, USB_DT_DEVICE); - cdev->desc.bMaxPacketSize0 = - cdev->gadget->ep0->maxpacket; + + /* + * If the speed is Super speed, then the supported + * max packet size is 512 and it should be sent as + * exponent of 2. So, 9(2^9=512) should be filled in + * bMaxPacketSize0. Also fill USB version as 3.0 + * if speed is Super speed. + */ + if (cdev->gadget->speed == USB_SPEED_SUPER) { + cdev->desc.bMaxPacketSize0 = 9; + cdev->desc.bcdUSB = cpu_to_le16(0x0300); + } else { + cdev->desc.bMaxPacketSize0 = + cdev->gadget->ep0->maxpacket; + } value = min(w_length, (u16) sizeof cdev->desc); memcpy(req->buf, &cdev->desc, value); break;