From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Date: Thu, 10 Mar 2016 02:30:15 +0000 (+0900)
Subject: usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer
X-Git-Tag: v4.1.23~52
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5c059995372c2861bb71cd761fc50cf773015d14;p=thirdparty%2Fkernel%2Fstable.git

usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer

[ Upstream commit 6490865c67825277b29638e839850882600b48ec ]

This patch adds a code to surely disable TX IRQ of the pipe before
starting TX DMAC transfer. Otherwise, a lot of unnecessary TX IRQs
may happen in rare cases when DMAC is used.

Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support")
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: Sasha Levin <sasha.levin@oracle.com>
---

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 32df738207265..f1893e08e51a4 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -890,6 +890,7 @@ static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 
 	pkt->trans = len;
 
+	usbhsf_tx_irq_ctrl(pipe, 0);
 	INIT_WORK(&pkt->work, xfer_work);
 	schedule_work(&pkt->work);