From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753537AbdBHGU1 (ORCPT ); Wed, 8 Feb 2017 01:20:27 -0500 Received: from relay1.mentorg.com ([192.94.38.131]:64722 "EHLO relay1.mentorg.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751618AbdBHGU0 (ORCPT ); Wed, 8 Feb 2017 01:20:26 -0500 From: Jiada Wang To: CC: , , , Subject: [PATCH linux-next v1 0/2] improve imx spi performance Date: Wed, 8 Feb 2017 15:20:26 +0900 Message-ID: <20170208062028.22313-1-jiada_wang@mentor.com> X-Mailer: git-send-email 2.9.3 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org previously burst length (BURST_LENGTH) is always set to equal to bits_per_word, causes a 10us gap between each word in transfer, which significantly affects performance. This patch set uses 32 bits tranfser to simulate lowers bits transfer, and by set burst length to maximum possible value to reduce number of gaps in both PIO & DMA transfers. * This patch set is against linux-next tree Jiada Wang (2): spi: imx: dynamic burst length adjust for PIO mode spi: imx: dynamic burst length adjust for DMA mode drivers/spi/spi-imx.c | 293 +++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 267 insertions(+), 26 deletions(-) -- 2.9.3