diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 934e8780cc04..ea8711e2ef67 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -676,6 +676,18 @@ static void dwc2_hc_init(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan) hcchar |= HCCHAR_EPDIR; if (chan->speed == USB_SPEED_LOW) hcchar |= HCCHAR_LSPDDEV; + + /* + * Masquerading Interrupt split transfers as Control puts the transfer + * into the non-periodic handler in the hub. This stops the hub + * dropping complete-split data in the microframe after a CSPLIT + * should have arrived, improving resilience to host IRQ latency. + * Devices are none the wiser - the handshake tokens are the same. + * The fakery is undone in dwc2_hc_n_intr(). + */ + if (chan->do_split && chan->ep_type == USB_ENDPOINT_XFER_INT) + chan->ep_type = USB_ENDPOINT_XFER_CONTROL; + hcchar |= chan->ep_type << HCCHAR_EPTYPE_SHIFT & HCCHAR_EPTYPE_MASK; hcchar |= chan->max_packet << HCCHAR_MPS_SHIFT & HCCHAR_MPS_MASK; dwc2_writel(hsotg, hcchar, HCCHAR(hc_num)); diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c index 5c7538d498dd..60622ef76b6b 100644 --- a/drivers/usb/dwc2/hcd_intr.c +++ b/drivers/usb/dwc2/hcd_intr.c @@ -2048,6 +2048,9 @@ static void dwc2_hc_n_intr(struct dwc2_hsotg *hsotg, int chnum) chan->hcint = hcintraw; + /* Un-masquerade the transfer type */ + if (chan->do_split) + chan->ep_type = chan->qh->ep_type; /* * If the channel was halted due to a dequeue, the qtd list might * be empty or at least the first entry will not be the active qtd.