From patchwork Mon Mar 15 13:14:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 400827 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=ham 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 E946EC4332E for ; Mon, 15 Mar 2021 13:15:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BDBAD64F0D for ; Mon, 15 Mar 2021 13:15:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230255AbhCONPa (ORCPT ); Mon, 15 Mar 2021 09:15:30 -0400 Received: from relay9-d.mail.gandi.net ([217.70.183.199]:58205 "EHLO relay9-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230133AbhCONPE (ORCPT ); Mon, 15 Mar 2021 09:15:04 -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 D979DFF809; Mon, 15 Mar 2021 13:14:59 +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, Laurent Pinchart Subject: [PATCH v2 04/18] media: i2c: rdacm20: Replace goto with a loop Date: Mon, 15 Mar 2021 14:14:58 +0100 Message-Id: <20210315131512.133720-5-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 During the camera module initialization the image sensor PID is read to verify it can correctly be identified. The current implementation is rather confused and uses a loop implemented with a label and a goto. Replace it with a more compact for() loop. No functional changes intended. Reviewed-by: Kieran Bingham Reviewed-by: Laurent Pinchart Signed-off-by: Jacopo Mondi --- drivers/media/i2c/rdacm20.c | 29 +++++++++++++---------------- 1 file changed, 13 insertions(+), 16 deletions(-) diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c index 4d9bac87cba8..e190fd2e611a 100644 --- a/drivers/media/i2c/rdacm20.c +++ b/drivers/media/i2c/rdacm20.c @@ -59,6 +59,8 @@ */ #define OV10635_PIXEL_RATE (44000000) +#define OV10635_PID_TIMEOUT 3 + static const struct ov10635_reg { u16 reg; u8 val; @@ -452,7 +454,7 @@ static const struct v4l2_subdev_ops rdacm20_subdev_ops = { static int rdacm20_initialize(struct rdacm20_device *dev) { - unsigned int retry = 3; + unsigned int i; int ret; /* Verify communication with the MAX9271: ping to wakeup. */ @@ -501,23 +503,18 @@ static int rdacm20_initialize(struct rdacm20_device *dev) return ret; usleep_range(10000, 15000); -again: - ret = ov10635_read16(dev, OV10635_PID); - if (ret < 0) { - if (retry--) - goto again; + for (i = 0; i < OV10635_PID_TIMEOUT; ++i) { + ret = ov10635_read16(dev, OV10635_PID); + if (ret == OV10635_VERSION) + break; + else if (ret >= 0) + /* Sometimes we get a successful read but a wrong id. */ + dev_dbg(dev->dev, "OV10635 ID mismatch (%d)\n", ret); - dev_err(dev->dev, "OV10635 ID read failed (%d)\n", - ret); - return -ENXIO; + usleep_range(1000, 2000); } - - if (ret != OV10635_VERSION) { - if (retry--) - goto again; - - dev_err(dev->dev, "OV10635 ID mismatch (0x%04x)\n", - ret); + if (i == OV10635_PID_TIMEOUT) { + dev_err(dev->dev, "OV10635 ID read failed (%d)\n", ret); return -ENXIO; }