usb: renesas_usbhs: fix the BCLR setting condition for non-DCP pipe

commit 6124607acc88fffeaadf3aacfeb3cc1304c87387 upstream.

This patch fixes an issue that the driver sets the BCLR bit of
{C,Dn}FIFOCTR register to 1 even when it's non-DCP pipe and
the FRDY bit of {C,Dn}FIFOCTR register is set to 1.

Fixes: e8d548d54968 ("usb: renesas_usbhs: fifo became independent from pipe.")
Cc: <stable@vger.kernel.org> # v3.1+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 95647562fd6a0286a0d136f1df5b889f459cbdbe..47a6ffab57cdc35eb199fe3a7f8c941817f0bf76 100644 (file)
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -261,11 +261,17 @@ static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
                              struct usbhs_fifo *fifo)
 {
        struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
+       int ret = 0;
 
        if (!usbhs_pipe_is_dcp(pipe))
-               usbhsf_fifo_barrier(priv, fifo);
+               ret = usbhsf_fifo_barrier(priv, fifo);
 
-       usbhs_write(priv, fifo->ctr, BCLR);
+       /*
+        * if non-DCP pipe, this driver should set BCLR when
+        * usbhsf_fifo_barrier() returns 0.
+        */
+       if (!ret)
+               usbhs_write(priv, fifo->ctr, BCLR);
 }
 
 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,