From patchwork Wed Mar 18 00:25:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 11444297 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 023CE90 for ; Wed, 18 Mar 2020 00:25:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D664F2073E for ; Wed, 18 Mar 2020 00:25:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="K7mqSZQJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727193AbgCRAZZ (ORCPT ); Tue, 17 Mar 2020 20:25:25 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:59906 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727148AbgCRAZY (ORCPT ); Tue, 17 Mar 2020 20:25:24 -0400 Received: from pendragon.bb.dnainternet.fi (81-175-216-236.bb.dnainternet.fi [81.175.216.236]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 89787130D; Wed, 18 Mar 2020 01:25:22 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1584491123; bh=r6drN6vvFeLxBEjgbV7lLPzr3gKiF6W/cjDjK8JfyMk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K7mqSZQJpen1CANrSIXWe9XcswldTfhkKVYj9oQeHV4k+nvZ8ysjgm6F8E16r0IbY YlugKF95R0uE91V1gQ5xyOX6IbS6ixsfQ8y64LCrtzorWO//2+mgcbDQuVLu/WDPFu wbvqPheXlSuGFRV+KcDhDAN5x5CZ2M3jkxpSvX7g= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: Sakari Ailus , Jacopo Mondi , =?utf-8?q?Niklas_S=C3=B6derlund?= , Kieran Bingham , Lad Prabhakar , linux-renesas-soc@vger.kernel.org Subject: [PATCH v2 3/4] media: v4l2-async: Log message in case of heterogenous fwnode match Date: Wed, 18 Mar 2020 02:25:06 +0200 Message-Id: <20200318002507.30336-4-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200318002507.30336-1-laurent.pinchart+renesas@ideasonboard.com> References: <20200318002507.30336-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org When a notifier supplies a device fwnode and a subdev supplies an endpoint fwnode, incorrect matches may occur if multiple subdevs correspond to the same device fwnode. This can't be handled transparently in the framework, and requires the notifier to switch to endpoint fwnodes. Log a message to notify of this problem. A second message is added to help accelerating the transition to endpoint matching. Signed-off-by: Laurent Pinchart Reviewed-by: Kieran Bingham Reviewed-by: Jacopo Mondi --- drivers/media/v4l2-core/v4l2-async.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 224b39a7aeb1..9f393a7be455 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -77,6 +77,7 @@ static bool match_fwnode(struct v4l2_async_notifier *notifier, struct fwnode_handle *dev_fwnode; bool asd_fwnode_is_ep; bool sd_fwnode_is_ep; + struct device *dev; const char *name; /* @@ -113,7 +114,28 @@ static bool match_fwnode(struct v4l2_async_notifier *notifier, fwnode_handle_put(dev_fwnode); - return dev_fwnode == other_fwnode; + if (dev_fwnode != other_fwnode) + return false; + + /* + * We have an heterogenous match. Retrieve the struct device of the + * side that matched on a device fwnode to print its driver name. + */ + if (sd_fwnode_is_ep) + dev = notifier->v4l2_dev ? notifier->v4l2_dev->dev + : notifier->sd->dev; + else + dev = sd->dev; + + if (dev && dev->driver) { + if (sd_fwnode_is_ep) + dev_info(dev, "Driver %s uses device fwnode, incorrect match may occur\n", + dev->driver->name); + dev_info(dev, "Consider updating driver %s to match on endpoints\n", + dev->driver->name); + } + + return true; } static bool match_custom(struct v4l2_async_notifier *notifier,