usb: dwc3: ep0: Handle requests greater than wMaxPacketSize

To allow ep0 out transfers of upto bounce buffer size
instead of maxpacketsize, use the transfer size as multiple
of ep0 maxpacket size.

Cc: stable@vger.kernel.org
Signed-off-by: Moiz Sonasath <m-sonasath@ti.com>
Signed-off-by: Partha Basak <p-basak2@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 25910e251c04..a40d3bb0f1c2 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -559,8 +559,12 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
         length = trb->size & DWC3_TRB_SIZE_MASK;
 
         if (dwc->ep0_bounced) {
+                unsigned transfer_size = ur->length;
+                unsigned maxp = ep0->endpoint.maxpacket;
+
+                transfer_size += (maxp - (transfer_size % maxp));
                 transferred = min_t(u32, ur->length,
-                                ep0->endpoint.maxpacket - length);
+                                transfer_size - length);
                 memcpy(ur->buf, dwc->ep0_bounce, transferred);
                 dwc->ep0_bounced = false;
         } else {