From patchwork Wed Jan 28 12:23:43 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Ribalda Delgado X-Patchwork-Id: 5734481 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 95041BF440 for ; Thu, 29 Jan 2015 02:09:09 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CC42B201BB for ; Thu, 29 Jan 2015 02:09:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 191EB20160 for ; Thu, 29 Jan 2015 02:09:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754343AbbA2CEq (ORCPT ); Wed, 28 Jan 2015 21:04:46 -0500 Received: from mail-lb0-f174.google.com ([209.85.217.174]:61202 "EHLO mail-lb0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753571AbbA2CEo (ORCPT ); Wed, 28 Jan 2015 21:04:44 -0500 Received: by mail-lb0-f174.google.com with SMTP id f15so23349823lbj.5; Wed, 28 Jan 2015 18:04:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=McFtE7LpCrnIdVPJJDuVpWLpQX9Gjl5OKkY5/t+ahsg=; b=uaNxKRR/KzOro4xkSaem3ZX5yE+Omcj+tRdX0G5NB9I7P+b8o2LPDbIJN8Wc4Az3io j8Fyu5K3GZmfGpnBJN8wN4A0xEfryPec2w99e+SC2De3SFL7o97QgR/aGP/rtvUb/H+9 J7avsBZWwDflILorLGJTjBYi+Me/mLyHXiXuQNwsA/woVs++sQjWyoIY00I4o/d5pt7s kPYDq9zQHvbhApoplzw7PnZLlb+o5zi7hPC9V0VH7SFWN8PJrPPtRY+VUo8wrwoPkOYB UhYVQVVzu3MB+yuCSYwXHXIqRzdhw+B2bytlkIgg7lHJapWhMCngPeUZqVZCeylUVhDN f6ew== X-Received: by 10.112.218.8 with SMTP id pc8mr5285792lbc.16.1422447842693; Wed, 28 Jan 2015 04:24:02 -0800 (PST) Received: from neopili.qtec.com (cpe.xe-3-0-1-778.vbrnqe10.dk.customer.tdc.net. [80.197.57.18]) by mx.google.com with ESMTPSA id xh7sm1293741lbb.17.2015.01.28.04.24.01 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 28 Jan 2015 04:24:01 -0800 (PST) From: Ricardo Ribalda Delgado To: Mark Brown , Michal Simek , =?UTF-8?q?S=C3=B6ren=20Brinkmann?= , linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Ricardo Ribalda Delgado Subject: [PATCH v2 04/15] spi/xilinx: Use cached value of register Date: Wed, 28 Jan 2015 13:23:43 +0100 Message-Id: <1422447834-23116-5-git-send-email-ricardo.ribalda@gmail.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1422447834-23116-1-git-send-email-ricardo.ribalda@gmail.com> References: <1422447834-23116-1-git-send-email-ricardo.ribalda@gmail.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The control register has not changed since the previous access. Therefore we can use the cached value and safe one bus access. Signed-off-by: Ricardo Ribalda Delgado --- drivers/spi/spi-xilinx.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c index a0f7c9d..12b311e 100644 --- a/drivers/spi/spi-xilinx.c +++ b/drivers/spi/spi-xilinx.c @@ -271,7 +271,6 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) * transmitter while the Isr refills the transmit register/FIFO, * or make sure it is stopped if we're done. */ - cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET); xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT, xspi->regs + XSPI_CR_OFFSET);