Patch "usb: renesas_usbhs: Fix DMAC sequence for receiving zero-length packet" has been added to the 3.18-stable tree

Patch "usb: renesas_usbhs: Fix DMAC sequence for receiving zero-length packet" has been added to the 3.18-stable tree

[gregkh]

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 packet

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-renesas_usbhs-fix-dmac-sequence-for-receiving-zero-length-packet.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 29c7f3e68eec4ae94d85ad7b5dfdafdb8089f513 Mon Sep 17 00:00:00 2001
From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
Date: Mon, 2 Oct 2017 14:01:41 +0900
Subject: usb: renesas_usbhs: Fix DMAC sequence for receiving zero-length packet

From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>

commit 29c7f3e68eec4ae94d85ad7b5dfdafdb8089f513 upstream.

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.

Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
[shimoda: revise the commit log]
Fixes: e73a9891b3a1 ("usb: renesas_usbhs: add DMAEngine support")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -880,9 +880,9 @@ static void xfer_work(struct work_struct
 		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:


Patches currently in stable-queue which might be from kazuya.mizuguchi.ks@renesas.com are

queue-3.18/usb-renesas_usbhs-fix-dmac-sequence-for-receiving-zero-length-packet.patch