[PATCH 3.10 076/143] usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer

From: Willy Tarreau
Date: Sun Jun 05 2016 - 06:23:44 EST

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>

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@xxxxxxxxxxxxxxx> # v3.1+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
drivers/usb/renesas_usbhs/fifo.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 540e688..157a9f9 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);