Commit fd06e777 authored Mar 10, 2016 by Yoshihiro Shimoda Committed by Sasha Levin Apr 20, 2016

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: e73a9891 ("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>

parent 237200d1

drivers/usb/renesas_usbhs/fifo.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -907,6 +907,7 @@ 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);