From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751665AbcHGJUt (ORCPT ); Sun, 7 Aug 2016 05:20:49 -0400 Received: from regular1.263xmail.com ([211.150.99.131]:57582 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751527AbcHGJUs (ORCPT ); Sun, 7 Aug 2016 05:20:48 -0400 X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 X-RL-SENDER: zhengxing@rock-chips.com X-FST-TO: linux-rockchip@lists.infradead.org X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: zhengxing@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 Subject: Re: [PATCH 2/3] dmaengine: pl330: enable burst mode by parsing dt To: Shawn Lin , Vinod Koul References: <1470365602-32586-1-git-send-email-shawn.lin@rock-chips.com> <1470365602-32586-3-git-send-email-shawn.lin@rock-chips.com> Cc: Rob Herring , Huibin Hong , devicetree@vger.kernel.org, dianders@chromium.org, briannorris@chromium.org, Caesar Wang , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org From: Xing Zheng Message-ID: <57A6FD61.6080003@rock-chips.com> Date: Sun, 7 Aug 2016 17:20:33 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <1470365602-32586-3-git-send-email-shawn.lin@rock-chips.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Shawn, On 2016年08月05日 10:53, Shawn Lin wrote: > Currently pl330 use single mode defaultly. But burst > mode can improve efficiency of memory accessing. We > couldn't enable it by defalut in case of breaking any > Socs which don't support it. > > With burst mode supported, we could see the improvement > significantly when tesing SPI transfer etc. > > default single mode > [ 88.292550] spi write 65536*1 cost 32402us speed:2022KB/S > > After applied with burst mode(len 16) > [ 17.625296] spi write 65536*1 cost 17830us speed:3675KB/S > > Cc: Huibin Hong > Cc: Xing Zheng > Signed-off-by: Shawn Lin > --- > Tested-by: Xing Zheng Thanks -- - Xing Zheng