From edb92eaf1d478ac52e7d258af35739c76c03efea Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Date: Fri, 16 Mar 2018 15:36:17 -0700
Subject: [PATCH] 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>
---
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 796c9b149728b..f51750bcd1528 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);
--
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