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usb: composite: Fix max packet size for USB3.0

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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>
This commit is contained in:
Siva Durga Prasad Paladugu 2018-12-13 15:16:36 +05:30 committed by Marek Vasut
parent 5d060ec0dc
commit 771e76515e
1 changed files with 15 additions and 2 deletions
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17
drivers/usb/gadget/composite.c
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@ -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;