patch "usb: renesas_usbhs: Fix DMAC sequence for receiving zero-length" added to usb-linus

This is a note to let you know that I've just added the patch titled

usb: renesas_usbhs: Fix DMAC sequence for receiving zero-length

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: Kazuya Mizuguchi <[email protected]>
Date: Mon, 2 Oct 2017 14:01:41 +0900
Subject: usb: renesas_usbhs: Fix DMAC sequence for receiving zero-length
packet

The DREQE bit of the DnFIFOSEL should be set to 1 after the DE bit of USB-DMAC on R-Car SoCs is set to 1 after the USB-DMAC received a zero-length packet. Otherwise, a transfer completion interruption of USB-DMAC doesn't happen. Even if the driver changes the sequence, normal operations (transmit/receive without zero-length packet) will not cause any side-effects. So, this patch fixes the sequence anyway.

---
 drivers/usb/renesas_usbhs/fifo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 68f26904c316..50285b01da92 100644
@@ -857,9 +857,9 @@ static void xfer_work(struct work_struct *work)
 		fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
 
 	usbhs_pipe_running(pipe, 1);
-	usbhsf_dma_start(pipe, fifo);
 	usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
 	dma_async_issue_pending(chan);
+	usbhsf_dma_start(pipe, fifo);
 	usbhs_pipe_enable(pipe);
 
 xfer_work_end:

2.14.2