[PATCH 3.12 50/78] usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer

From: Jiri Slaby
Date: Fri Apr 22 2016 - 07:16:53 EST

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

3.12-stable review patch. If anyone has any objections, please let me know.


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")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
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 1550c103f8a3..13170ed3c392 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -946,6 +946,7 @@ 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);