From patchwork Mon Mar 25 00:21:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janusz Krzysztofik X-Patchwork-Id: 55198 X-Patchwork-Delegate: sakari.ailus@iki.fi Received: from vger.kernel.org ([209.132.180.67]) by www.linuxtv.org with esmtp (Exim 4.84_2) (envelope-from ) id 1h8DMy-0007p6-KG; Mon, 25 Mar 2019 00:21:40 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729212AbfCYAVe (ORCPT + 1 other); Sun, 24 Mar 2019 20:21:34 -0400 Received: from mail-lj1-f195.google.com ([209.85.208.195]:42277 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729195AbfCYAVe (ORCPT ); Sun, 24 Mar 2019 20:21:34 -0400 Received: by mail-lj1-f195.google.com with SMTP id v22so6225235lje.9; Sun, 24 Mar 2019 17:21:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Zb4WUz8SUAA1BJCmhgFbxG1PUWXncRJQ2t7FG+GNPic=; b=CuBMbl0ZI4oyGtzRqCCOa1f1d/x+zZaZcRnc0utjQACGflg7wp3Poy7CcqMjJlf83k /sL3wmoWdgz0qbrI67fmESN5xii5v2tdBgNKtupwcDcKCUiLdEH2/g5hf1Z29Vqsw/sL iCP2H6/tTYuBRMs9IGDAMoPYHvENcEjNhBRTQO8TbJ9gejxs7M2MaZE6bd+7AsTAd2jT ZSkbS6/lvmvDcJmg9KvqbF1egSWmA23YM33aiDKbqEJnCF0coSSK7HxcFipoyJ3vWYFQ aaqudq4WUQxylBd6TtgBdKBl5bjXYAqU3MjuMPgGQff2ZWZo82w9FwQ1u9XcgW+Qi3wC kcVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Zb4WUz8SUAA1BJCmhgFbxG1PUWXncRJQ2t7FG+GNPic=; b=W5Q7mdiIQui38DbFnZ27vQuOi3PFXhsYmgVOONueVQeF0cRUnypHST96XXYyyY60Eq eOmc+oIcj2gPuEUnXOriLxpFAB4uRmLwP7ZFgSVijsn6M7vBVF3k5p+XHGoxYHMEMML1 Qrrv0f/9+CftHfR9/s3xsMY34VgWHK5+2yXAobhq1rLL4wIwegcTl8k200ROflUbcdtz m4mLGGHAWyUgMXcx9Gur4tkOj/rhyaNoZm7ulDc+EigwmThZ98xbmGvEtjkFXCArSUcG 8C+XI+6THeed/+GkkFOFx1ZOaVmjyMGa8paKbpg3huiZW1ctr2NyM/0GOnA+CKtr8wt2 Rc7g== X-Gm-Message-State: APjAAAWXLhgHmjpJKyIJLvX3CxckmCGPJA2zE7Sd1nYir0hSqmoe++JY Th6zhBdhEHdf3ORfqeRev3U= X-Google-Smtp-Source: APXvYqxoDxK4vGxbFzhXN2KKzRsw/5DeeBwxe6kd4orMlnfDu6/dwSD8FmEha518ro9uzJgn3f0P1w== X-Received: by 2002:a2e:97d3:: with SMTP id m19mr11491968ljj.63.1553473291799; Sun, 24 Mar 2019 17:21:31 -0700 (PDT) Received: from z50.gdansk-morena.vectranet.pl (109241207190.gdansk.vectranet.pl. [109.241.207.190]) by smtp.gmail.com with ESMTPSA id r9sm3114637lff.83.2019.03.24.17.21.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 24 Mar 2019 17:21:30 -0700 (PDT) From: Janusz Krzysztofik To: Mauro Carvalho Chehab Cc: Hans Verkuil , Sakari Ailus , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Janusz Krzysztofik , stable@vger.kernel.org Subject: [PATCH] media: ov6650: Fix sensor possibly not detected on probe Date: Mon, 25 Mar 2019 01:21:12 +0100 Message-Id: <20190325002112.6920-1-jmkrzyszt@gmail.com> X-Mailer: git-send-email 2.19.2 MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org After removal of clock_start() from before soc_camera_init_i2c() in soc_camera_probe() by commit 9aea470b399d ("[media] soc-camera: switch I2C subdevice drivers to use v4l2-clk") introduced in v3.11, the ov6650 driver could no longer probe the sensor successfully because its clock was no longer turned on in advance. The issue was initially worked around by adding that missing clock_start() equivalent to OMAP1 camera interface driver - the only user of this sensor - but a propoer fix should be rather implemented in the sensor driver code itself. Fix the issue by inserting a delay between the clock is turned on and the sensor I2C registers are read for the first time. Tested on Amstrad Delta with now out of tree but still locally maintained omap1_camera host driver. Fixes: 9aea470b399d ("[media] soc-camera: switch I2C subdevice drivers to use v4l2-clk") Signed-off-by: Janusz Krzysztofik Cc: stable@vger.kernel.org --- drivers/media/i2c/ov6650.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/media/i2c/ov6650.c b/drivers/media/i2c/ov6650.c index c33fd584cb44..f9359b11fa5c 100644 --- a/drivers/media/i2c/ov6650.c +++ b/drivers/media/i2c/ov6650.c @@ -814,6 +814,8 @@ static int ov6650_video_probe(struct i2c_client *client) if (ret < 0) return ret; + msleep(20); + /* * check and show product ID and manufacturer ID */