Patch "dmaengine: at_xdmac: fix resume for cyclic transfers" has been added to the 4.4-stable tree

Patch "dmaengine: at_xdmac: fix resume for cyclic transfers" has been added to the 4.4-stable tree

[gregkh]

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

    dmaengine: at_xdmac: fix resume for cyclic transfers

to the 4.4-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:
     dmaengine-at_xdmac-fix-resume-for-cyclic-transfers.patch
and it can be found in the queue-4.4 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 611dcadb01c89d1d3521450c05a4ded332e5a32d Mon Sep 17 00:00:00 2001
From: Songjun Wu <songjun.wu@atmel.com>
Date: Mon, 18 Jan 2016 11:14:44 +0100
Subject: dmaengine: at_xdmac: fix resume for cyclic transfers

From: Songjun Wu <songjun.wu@atmel.com>

commit 611dcadb01c89d1d3521450c05a4ded332e5a32d upstream.

When having cyclic transfers, the channel was paused when performing
suspend but was not correctly resumed.

Signed-off-by: Songjun Wu <songjun.wu@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver")
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/dma/at_xdmac.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1688,6 +1688,7 @@ static int at_xdmac_device_terminate_all
 	list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node)
 		at_xdmac_remove_xfer(atchan, desc);
 
+	clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
 	clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
 	spin_unlock_irqrestore(&atchan->lock, flags);
 
@@ -1820,6 +1821,8 @@ static int atmel_xdmac_resume(struct dev
 		atchan = to_at_xdmac_chan(chan);
 		at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc);
 		if (at_xdmac_chan_is_cyclic(atchan)) {
+			if (at_xdmac_chan_is_paused(atchan))
+				at_xdmac_device_resume(chan);
 			at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda);
 			at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc);
 			at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim);


Patches currently in stable-queue which might be from songjun.wu@atmel.com are

queue-4.4/dmaengine-at_xdmac-fix-resume-for-cyclic-transfers.patch