From patchwork Wed Feb 24 08:20:27 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sascha Hauer X-Patchwork-Id: 8402641 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 59F479F7C9 for ; Wed, 24 Feb 2016 08:20:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7856620361 for ; Wed, 24 Feb 2016 08:20:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 862F02034A for ; Wed, 24 Feb 2016 08:20:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757937AbcBXIUs (ORCPT ); Wed, 24 Feb 2016 03:20:48 -0500 Received: from metis.ext.4.pengutronix.de ([92.198.50.35]:41508 "EHLO metis.ext.4.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756950AbcBXIUr (ORCPT ); Wed, 24 Feb 2016 03:20:47 -0500 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1aYUgY-0004A8-8z; Wed, 24 Feb 2016 09:20:38 +0100 Received: from sha by dude.hi.pengutronix.de with local (Exim 4.86) (envelope-from ) id 1aYUgX-0002a1-HI; Wed, 24 Feb 2016 09:20:37 +0100 From: Sascha Hauer To: linux-spi@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, Mark Brown , Anton Bondarenko , Sascha Hauer Subject: [PATCH 3/9] spi: imx: drop unnecessary read/modify/write Date: Wed, 24 Feb 2016 09:20:27 +0100 Message-Id: <1456302033-25638-4-git-send-email-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1456302033-25638-1-git-send-email-s.hauer@pengutronix.de> References: <1456302033-25638-1-git-send-email-s.hauer@pengutronix.de> X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-spi@vger.kernel.org Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 When the MX51_ECSPI_DMA is configured we control every single bit of the register, so there's no need to read/modify/write it. Instead just write the value we want to have in the register. Also, drop unnecessary check if we are actually doing DMA. The values written to the register have no effect in PIO mode and value written there during the last DMA transfer is still in the register, so we can equally well always write a value. Signed-off-by: Sascha Hauer --- drivers/spi/spi-imx.c | 31 ++++++++++--------------------- 1 file changed, 10 insertions(+), 21 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 5792918..ec03304 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -240,9 +240,9 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, #define MX51_ECSPI_DMA_RXT_WML_OFFSET 24 #define MX51_ECSPI_DMA_RXT_WML_MASK (0x3F << 24) -#define MX51_ECSPI_DMA_TEDEN_OFFSET 7 -#define MX51_ECSPI_DMA_RXDEN_OFFSET 23 -#define MX51_ECSPI_DMA_RXTDEN_OFFSET 31 +#define MX51_ECSPI_DMA_TEDEN (1 << 7) +#define MX51_ECSPI_DMA_RXDEN (1 << 23) +#define MX51_ECSPI_DMA_RXTDEN (1 << 31) #define MX51_ECSPI_STAT 0x18 #define MX51_ECSPI_STAT_RR (1 << 3) @@ -318,8 +318,7 @@ static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx) static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, struct spi_imx_config *config) { - u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0, dma = 0; - u32 tx_wml_cfg, rx_wml_cfg, rxt_wml_cfg; + u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0; u32 clk = config->speed_hz, delay, reg; /* @@ -392,22 +391,12 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, * Configure the DMA register: setup the watermark * and enable DMA request. */ - if (spi_imx->dma_is_inited) { - dma = readl(spi_imx->base + MX51_ECSPI_DMA); - - rx_wml_cfg = spi_imx->wml << MX51_ECSPI_DMA_RX_WML_OFFSET; - tx_wml_cfg = spi_imx->wml << MX51_ECSPI_DMA_TX_WML_OFFSET; - rxt_wml_cfg = spi_imx->wml << MX51_ECSPI_DMA_RXT_WML_OFFSET; - dma = (dma & ~MX51_ECSPI_DMA_TX_WML_MASK - & ~MX51_ECSPI_DMA_RX_WML_MASK - & ~MX51_ECSPI_DMA_RXT_WML_MASK) - | rx_wml_cfg | tx_wml_cfg | rxt_wml_cfg - |(1 << MX51_ECSPI_DMA_TEDEN_OFFSET) - |(1 << MX51_ECSPI_DMA_RXDEN_OFFSET) - |(1 << MX51_ECSPI_DMA_RXTDEN_OFFSET); - - writel(dma, spi_imx->base + MX51_ECSPI_DMA); - } + + writel(spi_imx->wml << MX51_ECSPI_DMA_RX_WML_OFFSET | + spi_imx->wml << MX51_ECSPI_DMA_TX_WML_OFFSET | + spi_imx->wml << MX51_ECSPI_DMA_RXT_WML_OFFSET | + MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN | + MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA); return 0; }