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usb: core: urb: Check SSP isoc ep comp descriptor 

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

Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2018-03-16 15:36:17 -07:00 committed by Greg Kroah-Hartman
parent 85a09bf492
commit edb92eaf1d
1 changed files with 8 additions and 0 deletions
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8
drivers/usb/core/urb.c
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@ -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);