From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:40502 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753100AbbJMVtx (ORCPT ); Tue, 13 Oct 2015 17:49:53 -0400 Subject: Patch "dmaengine: at_xdmac: change block increment addressing mode" has been added to the 4.2-stable tree To: maxime.ripard@free-electrons.com, gregkh@linuxfoundation.org, ludovic.desroches@atmel.com, vinod.koul@intel.com Cc: , From: Date: Tue, 13 Oct 2015 14:49:50 -0700 Message-ID: <1444772990214173@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled dmaengine: at_xdmac: change block increment addressing mode to the 4.2-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-change-block-increment-addressing-mode.patch and it can be found in the queue-4.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From a1cf09031e641d3cceaca4a4dd20ef6a785bc9b3 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Tue, 15 Sep 2015 15:36:00 +0200 Subject: dmaengine: at_xdmac: change block increment addressing mode From: Maxime Ripard 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 Signed-off-by: Ludovic Desroches Fixes: 6007ccb57744 ("dmaengine: xdmac: Add interleaved transfer support") Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- 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; } Patches currently in stable-queue which might be from maxime.ripard@free-electrons.com are queue-4.2/dmaengine-at_xdmac-change-block-increment-addressing-mode.patch queue-4.2/watchdog-sunxi-fix-activation-of-system-reset.patch queue-4.2/arm-dts-sunxi-raise-minimum-cpu-voltage-for-sun7i-a20-to-meet-soc-specifications.patch