usb: dwc2: host: Fix wMaxPacketSize handling (fix webcam regression)

In commit abb621844f6a ("usb: ch9: make usb_endpoint_maxp() return
only packet size") the API to usb_endpoint_maxp() changed.  It used to
just return wMaxPacketSize but after that commit it returned
wMaxPacketSize with the high bits (the multiplier) masked off.  If you
wanted to get the multiplier it was now up to your code to call the
new usb_endpoint_maxp_mult() which was introduced in
commit 541b6fe63023 ("usb: add helper to extract bits 12:11 of
wMaxPacketSize").

Prior to the API change most host drivers were updated, but no update
was made to dwc2.  Presumably it was assumed that dwc2 was too
simplistic to use the multiplier and thus just didn't support a
certain class of USB devices.  However, it turns out that dwc2 did use
the multiplier and many devices using it were working quite nicely.
That means that many USB devices have been broken since the API
change.  One such device is a Logitech HD Pro Webcam C920.

Specifically, though dwc2 didn't directly call usb_endpoint_maxp(), it
did call usb_maxpacket() which in turn called usb_endpoint_maxp().

Let's update dwc2 to work properly with the new API.

Fixes: abb621844f6a ("usb: ch9: make usb_endpoint_maxp() return only packet size")
Cc: stable@vger.kernel.org
Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/usb/dwc2/hcd_queue.c b/drivers/usb/dwc2/hcd_queue.c
index ea3aa640c15c..68bbac64b753 100644
--- a/drivers/usb/dwc2/hcd_queue.c
+++ b/drivers/usb/dwc2/hcd_queue.c
@@ -708,7 +708,7 @@ static void dwc2_hs_pmap_unschedule(struct dwc2_hsotg *hsotg,
 static int dwc2_uframe_schedule_split(struct dwc2_hsotg *hsotg,
                                       struct dwc2_qh *qh)
 {
-        int bytecount = dwc2_hb_mult(qh->maxp) * dwc2_max_packet(qh->maxp);
+        int bytecount = qh->maxp_mult * qh->maxp;
         int ls_search_slice;
         int err = 0;
         int host_interval_in_sched;
@@ -1332,7 +1332,7 @@ static int dwc2_check_max_xfer_size(struct dwc2_hsotg *hsotg,
         u32 max_channel_xfer_size;
         int status = 0;
 
-        max_xfer_size = dwc2_max_packet(qh->maxp) * dwc2_hb_mult(qh->maxp);
+        max_xfer_size = qh->maxp * qh->maxp_mult;
         max_channel_xfer_size = hsotg->params.max_transfer_size;
 
         if (max_xfer_size > max_channel_xfer_size) {
@@ -1517,8 +1517,9 @@ static void dwc2_qh_init(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
         u32 prtspd = (hprt & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;
         bool do_split = (prtspd == HPRT0_SPD_HIGH_SPEED &&
                          dev_speed != USB_SPEED_HIGH);
-        int maxp = dwc2_hcd_get_mps(&urb->pipe_info);
-        int bytecount = dwc2_hb_mult(maxp) * dwc2_max_packet(maxp);
+        int maxp = dwc2_hcd_get_maxp(&urb->pipe_info);
+        int maxp_mult = dwc2_hcd_get_maxp_mult(&urb->pipe_info);
+        int bytecount = maxp_mult * maxp;
         char *speed, *type;
 
         /* Initialize QH */
@@ -1531,6 +1532,7 @@ static void dwc2_qh_init(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
 
         qh->data_toggle = DWC2_HC_PID_DATA0;
         qh->maxp = maxp;
+        qh->maxp_mult = maxp_mult;
         INIT_LIST_HEAD(&qh->qtd_list);
         INIT_LIST_HEAD(&qh->qh_list_entry);