usb: gadget: r8a66597-udc: fix flush fifo handling
The "BCLR" in CFIFOCTR/DnFIFOCTR can flush the fifo of "CPU side" only.
To flush the fifo of "SIE side", we have to use the "ACLRM" in PIPEnCTR.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/r8a66597-udc.c b/drivers/usb/gadget/r8a66597-udc.c
index 38f9988..24f84b2 100644
--- a/drivers/usb/gadget/r8a66597-udc.c
+++ b/drivers/usb/gadget/r8a66597-udc.c
@@ -1718,6 +1718,8 @@
if (list_empty(&ep->queue) && !ep->busy) {
pipe_stop(ep->r8a66597, ep->pipenum);
r8a66597_bclr(ep->r8a66597, BCLR, ep->fifoctr);
+ r8a66597_write(ep->r8a66597, ACLRM, ep->pipectr);
+ r8a66597_write(ep->r8a66597, 0, ep->pipectr);
}
spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
}