From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756836AbbA2CEr (ORCPT ); Wed, 28 Jan 2015 21:04:47 -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 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-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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); -- 2.1.4