On Thu, May 01, 2014 at 03:16:04AM -0400, Zhuang Jin Can wrote:
> endpoint.maxburst may be 0 if a gadget doesn't call config_ep_by_speed()
> to update it from the companion descriptor.
> And endpoint.maxburst - 1 returns 11111b which wrongly sets bit
> 26 of endpoint parameter 0.
> This sets a wrong endpoint state and will cause "Get Endpoint State"
> command can't get the corret endpoint state and "Set Endpoint Config"
> command can't restore the correct endpoint state during hibernation
> resume flow.
> Thus, when endpoint.maxburst is 0, we should set burst as 0 directly.
>
> Signed-off-by: Zhuang Jin Can <jin.can.zhuang@xxxxxxxxx>
> ---
> drivers/usb/dwc3/gadget.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 70715ee..44eca95 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -440,7 +440,8 @@ static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
>
> /* Burst size is only needed in SuperSpeed mode */
> if (dwc->gadget.speed == USB_SPEED_SUPER) {
> - u32 burst = dep->endpoint.maxburst - 1;
> + u32 burst = dep->endpoint.maxburst ?
> + dep->endpoint.maxburst - 1 : 0;
again, you found a bug on the gadget driver. Fix that. composite.c
guarantees that for those functions which don't pass bMaxBurst,
gadget->maxburst will be set to *at least* 1.
--
balbi
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