[v4,02/15] usb: core: urb: Check SSP isoc ep comp descriptor

[Felipe Balbi <felipe.balbi@linux.intel.com>]

Hi,

Thinh Nguyen <Thinh.Nguyen@synopsys.com> writes:
> The maximum bytes per interval for USB SuperSpeed Plus can be set by
> isoc endpoint companion descriptor when it is above 48K. If the
> descriptor is provided, then use its value.
>
> USB 3.1 spec 9.6.8
>
> Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>

you should have Cc:ed Greg for this one. FWIW:

"This descriptor shall be returned for each Isochronous endpoint that
requires more than 48K bytes per Service Interval."

Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>

> ---
>  drivers/usb/core/urb.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
> index 9fdf137c4865..0ab4b896e3f3 100644
> --- a/drivers/usb/core/urb.c
> +++ b/drivers/usb/core/urb.c
> @@ -433,6 +433,14 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
>  			max *= mult;
>  		}
>  
> +		if (dev->speed == USB_SPEED_SUPER_PLUS &&
> +		    USB_SS_SSP_ISOC_COMP(ep->ss_ep_comp.bmAttributes)) {
> +			struct usb_ssp_isoc_ep_comp_descriptor *isoc_ep_comp;
> +
> +			isoc_ep_comp = &ep->ssp_isoc_ep_comp;
> +			max = le32_to_cpu(isoc_ep_comp->dwBytesPerInterval);
> +		}
> +
>  		/* "high bandwidth" mode, 1-3 packets/uframe? */
>  		if (dev->speed == USB_SPEED_HIGH)
>  			max *= usb_endpoint_maxp_mult(&ep->desc);
> -- 
> 2.11.0
>
> --
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