linux-kernel - [PATCH 4.2 054/258] dmaengine: at_xdmac: change block increment addressing mode

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Date:	Sat, 17 Oct 2015 18:56:07 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Vinod Koul <vinod.koul@...el.com>
Subject: [PATCH 4.2 054/258] dmaengine: at_xdmac: change block increment addressing mode

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

------------------

From: Maxime Ripard <maxime.ripard@...e-electrons.com>

commit a1cf09031e641d3cceaca4a4dd20ef6a785bc9b3 upstream.

The addressing mode we were using was not only incrementing the address at
each microblock, but also at each data boundary, which was severely slowing
the transfer, without any benefit since we were not using the data stride.

Switch to the micro block increment only in order to get back to an
acceptable performance level.

Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
Fixes: 6007ccb57744 ("dmaengine: xdmac: Add interleaved transfer support")
Signed-off-by: Vinod Koul <vinod.koul@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma/at_xdmac.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -878,14 +878,14 @@ at_xdmac_interleaved_queue_desc(struct d
 
 	if (xt->src_inc) {
 		if (xt->src_sgl)
-			chan_cc |=  AT_XDMAC_CC_SAM_UBS_DS_AM;
+			chan_cc |=  AT_XDMAC_CC_SAM_UBS_AM;
 		else
 			chan_cc |=  AT_XDMAC_CC_SAM_INCREMENTED_AM;
 	}
 
 	if (xt->dst_inc) {
 		if (xt->dst_sgl)
-			chan_cc |=  AT_XDMAC_CC_DAM_UBS_DS_AM;
+			chan_cc |=  AT_XDMAC_CC_DAM_UBS_AM;
 		else
 			chan_cc |=  AT_XDMAC_CC_DAM_INCREMENTED_AM;
 	}


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