usb: musb: fix tx fifo flush handling again

commit 45d73860530a14c608f410b91c6c341777bfa85d upstream.

commit 68fe05e2a451 ("usb: musb: fix tx fifo flush handling") drops the
1ms delay trying to solve the long disconnect time issue when
application queued many tx urbs. However, the 1ms delay is needed for
some use cases, for example, without the delay, reconnecting AR9271 WIFI
dongle no longer works if the connection is dropped from the AP.

So let's add back the 1ms delay in musb_h_tx_flush_fifo(), and solve the
long disconnect time problem with a separate patch for
usb_hcd_flush_endpoint().

Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 7da914bc2094467a92594143d4625a1305f73e33..33223e4b53c6e29a5e93b5801b872f5a00698dab 100644 (file)
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -1294,6 +1294,7 @@ void musb_host_tx(struct musb *musb, u8 epnum)
                                        | MUSB_TXCSR_TXPKTRDY);
                }
                        return;
+               mdelay(1);
        }
 
 done: