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-Url: https://git.stricted.de/?a=commitdiff_plain;h=f0f09678b2692b54cae611a1f00b33badada577d;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

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

commit 6490865c67825277b29638e839850882600b48ec upstream.

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: Willy Tarreau <w@1wt.eu>
---

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 540e688ce4a..157a9f9afc2 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -934,6 +934,7 @@ static int usbhsf_dma_try_pop(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);