[U-Boot] [PATCH] usb: composite: Fix max packet size for USB3.0

[Lukasz Majewski <lukma@denx.de>]

On Thu, 13 Dec 2018 14:24:32 +0100
Marek Vasut <marex@denx.de> wrote:

> On 12/13/2018 10:46 AM, Siva Durga Prasad Paladugu wrote:
> > 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. Without 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> Reviewed-by: Bin Meng
> > <bmeng.cn@gmail.com> ---
> > Changes from RFC:
> > - Fixed typo in description as per comment.
> > ---
> >  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;
> >   
> Applied, thanks
> 

Just for completeness:

Acked-by: Lukasz Majewski <lukma@denx.de>


Best regards,

Lukasz Majewski

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