From patchwork Mon Nov 4 08:50:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanislaw Gruszka X-Patchwork-Id: 841032 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C7C521494B1 for ; Mon, 4 Nov 2024 08:51:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730710265; cv=none; b=DkPEOhvQkvE/SmIYK+3pazJlIwgKXjUN2aZj6LT9jupnxlMKqpcYxLjunJGinguzyApnwCIRzhjv1nC3xgaxyIJP+MRfc1jGWzl3/gjx/OM6H+riQnZrzBB9y6eP0cYQZiKkngJTyLQ/PJFiwzk1xJ7jPf3o59YLVpN8DUpm0uA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730710265; c=relaxed/simple; bh=TsEJ6ynWkB0jYGdFN81jcDNxz7kmtcx2sp769SOXTOY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=trK/gnkUTkNmyG4tNf2UIIPG1x6w14SmWaKTstRJN1cXqFufH9glh0BK4WbTI0BdHn/DCeK/5VIvyQH/PuBkXpZLTfNiDLBlkuX0f6IvQBfkwAvHRv9x60xYpPJrE4W/lK7H3RTioCQjd9gDiQazIoiDtWC7ciw4znyiRwf/rUY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=V3IStAwd; arc=none smtp.client-ip=198.175.65.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="V3IStAwd" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1730710264; x=1762246264; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=TsEJ6ynWkB0jYGdFN81jcDNxz7kmtcx2sp769SOXTOY=; b=V3IStAwdw51xPtbiDsNT6oWrY7snkwvp7H8LjYghAgQQvLNFMf4acoiv CxpIvE6q92MuqOgQ2JtGaj2V/Sim0LxE7RsU0dBHaKTGqQnGD/A0AsBKZ SsmB9MMzXTiraUYSSosKa8embaYHfZTeFiywbmso6sh87ddX+2sAno3Uk ynq3hoDEcD00qmdSkNrEPARSB+Yvx0d8U06yR94W6two54917Tv1pw7m1 +sgRNHMMUBfRm22F5pzZFhWzS/sCSmd1lnE4+ApJZJmUGZpJWLCDq/ytj DQx3Yy8xuAlTJa2Gp6Lhnh0CmCcd3lCgKpPe2nVvkzvAlQ2wiBjYSZT42 Q==; X-CSE-ConnectionGUID: EAbnAULvTDGDkAH0Cfp61A== X-CSE-MsgGUID: DSvdAW5MQhiOke3I/Dg1GA== X-IronPort-AV: E=McAfee;i="6700,10204,11222"; a="30343060" X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="30343060" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2024 00:51:04 -0800 X-CSE-ConnectionGUID: nkO9cwpzS46ODIZpoLglQg== X-CSE-MsgGUID: /3cEE4LFSKCWEVkZpFwjFw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,256,1725346800"; d="scan'208";a="88097814" Received: from sgruszka-mobl.ger.corp.intel.com (HELO localhost) ([10.245.97.183]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2024 00:51:02 -0800 From: Stanislaw Gruszka To: linux-usb@vger.kernel.org Cc: Wentong Wu , Sakari Ailus Subject: [PATCH 2/3] usb: misc: ljca: set small runtime autosuspend delay Date: Mon, 4 Nov 2024 09:50:55 +0100 Message-Id: <20241104085056.652294-2-stanislaw.gruszka@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241104085056.652294-1-stanislaw.gruszka@linux.intel.com> References: <20241104085056.652294-1-stanislaw.gruszka@linux.intel.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On some Lenovo platforms, the patch workarounds problems with ov2740 sensor initialization, which manifest themself like below: [ 4.540476] ov2740 i2c-INT3474:01: error -EIO: failed to find sensor [ 4.542066] ov2740 i2c-INT3474:01: probe with driver ov2740 failed with error -5 or [ 7.742633] ov2740 i2c-INT3474:01: chip id mismatch: 2740 != 0 [ 7.742638] ov2740 i2c-INT3474:01: error -ENXIO: failed to find sensor and also by random failures of video stream start. Issue can be reproduced by this script: n=0 k=0 while [ $n -lt 50 ] ; do sudo modprobe -r ov2740 sleep `expr $RANDOM % 5` sudo modprobe ov2740 if media-ctl -p | grep -q ov2740 ; then let k++ fi let n++ done echo Success rate $k/$n Without the patch, success rate is approximately 15 or 50 tries. With the patch it does not fail. This problem is some hardware or firmware malfunction, that can not be easy debug and fix. While setting small autosuspend delay is not perfect workaround as user can configure it to any value, it will prevent the failures by default. Additionally setting small autosuspend delay should have positive effect on power consumption as for most ljca workloads device is used for just a few milliseconds flowed by long periods of at least 100ms of inactivity (usually more). Fixes: acd6199f195d ("usb: Add support for Intel LJCA device") Cc: stable@vger.kernel.org Signed-off-by: Stanislaw Gruszka --- drivers/usb/misc/usb-ljca.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/misc/usb-ljca.c b/drivers/usb/misc/usb-ljca.c index dcb3c5d248ac..062b7fb47114 100644 --- a/drivers/usb/misc/usb-ljca.c +++ b/drivers/usb/misc/usb-ljca.c @@ -810,6 +810,7 @@ static int ljca_probe(struct usb_interface *interface, if (ret) goto err_free; + pm_runtime_set_autosuspend_delay(&usb_dev->dev, 10); usb_enable_autosuspend(usb_dev); return 0;