usb: dwc3: gadget: Fix dep->interval for fullspeed interrupt

The dep->interval captures the number of frames/microframes per interval
from bInterval. Fullspeed interrupt endpoint bInterval is the number of
frames per interval and not 2^(bInterval - 1). So fix it here. This
change is only for debugging purpose and should not affect the interrupt
endpoint operation.

Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/1263b563dedc4ab8b0fb854fba06ce4bc56bd495.1612820995.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index d0f8d3ec855ff0f5f9e4f7c63da005bad6fbf579..aebcf8ec071639da21f0b698807fa5813890a65e 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -615,8 +615,13 @@ static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action)
                if (dwc->gadget->speed == USB_SPEED_FULL)
                        bInterval_m1 = 0;
 
+               if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
+                   dwc->gadget->speed == USB_SPEED_FULL)
+                       dep->interval = desc->bInterval;
+               else
+                       dep->interval = 1 << (desc->bInterval - 1);
+
                params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(bInterval_m1);
-               dep->interval = 1 << (desc->bInterval - 1);
        }
 
        return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, &params);