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@xxxxxxxxxxxxxxx>
Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
---
Changes in v5:
- Separate from patch series "usb: dwc3: Add new updates for DWC_usb31"
Changes in v4:
- None
Changes in v3:
- None
Changes in v2:
- None
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 796c9b149728..f51750bcd152 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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