From patchwork Fri May 5 13:50:30 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Quentin Schulz X-Patchwork-Id: 98639 Delivered-To: patch@linaro.org Received: by 10.140.96.100 with SMTP id j91csp133570qge; Fri, 5 May 2017 06:51:31 -0700 (PDT) X-Received: by 10.98.44.148 with SMTP id s142mr17573548pfs.251.1493992291525; Fri, 05 May 2017 06:51:31 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 81si5335101pfn.32.2017.05.05.06.51.31; Fri, 05 May 2017 06:51:31 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754371AbdEENup (ORCPT + 25 others); Fri, 5 May 2017 09:50:45 -0400 Received: from mail.free-electrons.com ([62.4.15.54]:59969 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752607AbdEENun (ORCPT ); Fri, 5 May 2017 09:50:43 -0400 Received: by mail.free-electrons.com (Postfix, from userid 110) id 076C6212DF; Fri, 5 May 2017 15:50:42 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT shortcircuit=ham autolearn=disabled version=3.4.0 Received: from localhost.localdomain (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.free-electrons.com (Postfix) with ESMTPSA id BBEB6207E1; Fri, 5 May 2017 15:50:41 +0200 (CEST) From: Quentin Schulz To: wg@grandegger.com, mkl@pengutronix.de, mario.huettel@gmx.net, socketcan@hartkopp.net Cc: Quentin Schulz , linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, alexandre.belloni@free-electrons.com, thomas.petazzoni@free-electrons.com Subject: [PATCH v4 1/4] can: m_can: move Message RAM initialization to function Date: Fri, 5 May 2017 15:50:30 +0200 Message-Id: <20170505135033.8349-1-quentin.schulz@free-electrons.com> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To avoid possible ECC/parity checksum errors when reading an uninitialized buffer, the entire Message RAM is initialized when probing the driver. This initialization is done in the same function reading the Device Tree properties. This patch moves the RAM initialization to a separate function so it can be called separately from device initialization from Device Tree. Signed-off-by: Quentin Schulz --- v4: - remove unused variables from m_can_of_parse_mram, drivers/net/can/m_can/m_can.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) -- 2.11.0 diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index bf8fdaeb955e..5da1bdb202a3 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1489,11 +1489,23 @@ static int register_m_can_dev(struct net_device *dev) return register_candev(dev); } +static void m_can_init_ram(struct m_can_priv *priv) +{ + int end, i, start; + + /* initialize the entire Message RAM in use to avoid possible + * ECC/parity checksum errors when reading an uninitialized buffer + */ + start = priv->mcfg[MRAM_SIDF].off; + end = priv->mcfg[MRAM_TXB].off + + priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE; + for (i = start; i < end; i += 4) + writel(0x0, priv->mram_base + i); +} + static void m_can_of_parse_mram(struct m_can_priv *priv, const u32 *mram_config_vals) { - int i, start, end; - priv->mcfg[MRAM_SIDF].off = mram_config_vals[0]; priv->mcfg[MRAM_SIDF].num = mram_config_vals[1]; priv->mcfg[MRAM_XIDF].off = priv->mcfg[MRAM_SIDF].off + @@ -1529,15 +1541,7 @@ static void m_can_of_parse_mram(struct m_can_priv *priv, priv->mcfg[MRAM_TXE].off, priv->mcfg[MRAM_TXE].num, priv->mcfg[MRAM_TXB].off, priv->mcfg[MRAM_TXB].num); - /* initialize the entire Message RAM in use to avoid possible - * ECC/parity checksum errors when reading an uninitialized buffer - */ - start = priv->mcfg[MRAM_SIDF].off; - end = priv->mcfg[MRAM_TXB].off + - priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE; - for (i = start; i < end; i += 4) - writel(0x0, priv->mram_base + i); - + m_can_init_ram(priv); } static int m_can_plat_probe(struct platform_device *pdev)