From patchwork Mon Mar 15 13:15:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 12139281 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 52EDFC4361B for ; Mon, 15 Mar 2021 13:16:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A48564EFB for ; Mon, 15 Mar 2021 13:16:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230341AbhCONPd (ORCPT ); Mon, 15 Mar 2021 09:15:33 -0400 Received: from relay9-d.mail.gandi.net ([217.70.183.199]:44853 "EHLO relay9-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230147AbhCONPL (ORCPT ); Mon, 15 Mar 2021 09:15:11 -0400 X-Originating-IP: 79.22.58.175 Received: from uno.homenet.telecomitalia.it (host-79-22-58-175.retail.telecomitalia.it [79.22.58.175]) (Authenticated sender: jacopo@jmondi.org) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id 02C47FF809; Mon, 15 Mar 2021 13:15:05 +0000 (UTC) From: Jacopo Mondi To: kieran.bingham+renesas@ideasonboard.com, laurent.pinchart+renesas@ideasonboard.com, niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org Cc: Jacopo Mondi , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 06/18] media: i2c: max9271: Check max9271_write() return Date: Mon, 15 Mar 2021 14:15:00 +0100 Message-Id: <20210315131512.133720-7-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210315131512.133720-1-jacopo+renesas@jmondi.org> References: <20210315131512.133720-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Check the return value of the max9271_write() function in the max9271 library driver. While at it, modify an existing condition to be made identical to other checks. Signed-off-by: Jacopo Mondi Reviewed-by: Kieran Bingham Reviewed-by: Laurent Pinchart --- drivers/media/i2c/max9271.c | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-) diff --git a/drivers/media/i2c/max9271.c b/drivers/media/i2c/max9271.c index c495582dcff6..2c7dc7fb9846 100644 --- a/drivers/media/i2c/max9271.c +++ b/drivers/media/i2c/max9271.c @@ -106,7 +106,10 @@ int max9271_set_serial_link(struct max9271_device *dev, bool enable) * Short delays here appear to show bit-errors in the writes following. * Therefore a conservative delay seems best here. */ - max9271_write(dev, 0x04, val); + ret = max9271_write(dev, 0x04, val); + if (ret < 0) + return ret; + usleep_range(5000, 8000); return 0; @@ -118,7 +121,7 @@ int max9271_configure_i2c(struct max9271_device *dev, u8 i2c_config) int ret; ret = max9271_write(dev, 0x0d, i2c_config); - if (ret) + if (ret < 0) return ret; /* The delay required after an I2C bus configuration change is not @@ -143,7 +146,10 @@ int max9271_set_high_threshold(struct max9271_device *dev, bool enable) * Enable or disable reverse channel high threshold to increase * immunity to power supply noise. */ - max9271_write(dev, 0x08, enable ? ret | BIT(0) : ret & ~BIT(0)); + ret = max9271_write(dev, 0x08, enable ? ret | BIT(0) : ret & ~BIT(0)); + if (ret < 0) + return ret; + usleep_range(2000, 2500); return 0; @@ -152,6 +158,8 @@ EXPORT_SYMBOL_GPL(max9271_set_high_threshold); int max9271_configure_gmsl_link(struct max9271_device *dev) { + int ret; + /* * Configure the GMSL link: * @@ -162,16 +170,24 @@ int max9271_configure_gmsl_link(struct max9271_device *dev) * * TODO: Make the GMSL link configuration parametric. */ - max9271_write(dev, 0x07, MAX9271_DBL | MAX9271_HVEN | - MAX9271_EDC_1BIT_PARITY); + ret = max9271_write(dev, 0x07, MAX9271_DBL | MAX9271_HVEN | + MAX9271_EDC_1BIT_PARITY); + if (ret < 0) + return ret; + usleep_range(5000, 8000); /* * Adjust spread spectrum to +4% and auto-detect pixel clock * and serial link rate. */ - max9271_write(dev, 0x02, MAX9271_SPREAD_SPECT_4 | MAX9271_R02_RES | - MAX9271_PCLK_AUTODETECT | MAX9271_SERIAL_AUTODETECT); + ret = max9271_write(dev, 0x02, + MAX9271_SPREAD_SPECT_4 | MAX9271_R02_RES | + MAX9271_PCLK_AUTODETECT | + MAX9271_SERIAL_AUTODETECT); + if (ret < 0) + return ret; + usleep_range(5000, 8000); return 0;