linux-kernel - [PATCH 4.2.y-ckt 197/305] dmaengine: at_xdmac: fix at_xdmac_prep_dma

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Message-Id: <1452902519-2754-198-git-send-email-kamal@canonical.com>
Date:	Fri, 15 Jan 2016 16:00:11 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Cyrille Pitchen <cyrille.pitchen@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 197/305] dmaengine: at_xdmac: fix at_xdmac_prep_dma_memcpy()

4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Cyrille Pitchen <cyrille.pitchen@...el.com>

commit aa876cd4b41b4e3bcfbc75dd5750d75d5fa97a67 upstream.

This patch fixes at_xdmac_prep_dma_memcpy(). Indeed the data width field
of the Channel Configuration register was not updated properly in the
loop: the bits of the dwidth field were not cleared before adding their
new value.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
Acked-by: Ludovic Desroches <ludovic.desroches@...el.com>
Fixes: e1f7c9eee70 ("dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver")
Signed-off-by: Vinod Koul <vinod.koul@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/dma/at_xdmac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index 2205def..c01cdec 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1086,6 +1086,7 @@ at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 		/* Check remaining length and change data width if needed. */
 		dwidth = at_xdmac_align_width(chan,
 					      src_addr | dst_addr | xfer_size);
+		chan_cc &= ~AT_XDMAC_CC_DWIDTH_MASK;
 		chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
 
 		ublen = xfer_size >> dwidth;
-- 
1.9.1