usb: xhci: Set bulk EP maxpacket to 8 for buggy FS devices
Some FS devices report maxpacket size as 4 for their BULK EPs
which is incorrect as per USB specification. This results in
ep_config command to controller timing out and enumeration fails.
As minimum maxpacket size for FS is 8, hence override the same
for such devices.
CRs-fixed: 1002876
Change-Id: I70c2210b4eb93f557eef306fcbc11308b7b33e07
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 374750f..b59efd2 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1507,6 +1507,11 @@
/* Some devices get this wrong */
if (usb_endpoint_xfer_bulk(&ep->desc) && udev->speed == USB_SPEED_HIGH)
max_packet = 512;
+
+ if (usb_endpoint_xfer_bulk(&ep->desc) && udev->speed == USB_SPEED_FULL
+ && max_packet < 8)
+ max_packet = 8;
+
/* xHCI 1.0 and 1.1 indicates that ctrl ep avg TRB Length should be 8 */
if (usb_endpoint_xfer_control(&ep->desc) && xhci->hci_version >= 0x100)
avg_trb_len = 8;