From patchwork Wed Mar 18 00:25:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 11444291 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 3C01C90 for ; Wed, 18 Mar 2020 00:25:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C90A2073E for ; Wed, 18 Mar 2020 00:25:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="oQPUa8ni" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727166AbgCRAZX (ORCPT ); Tue, 17 Mar 2020 20:25:23 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:59880 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727148AbgCRAZX (ORCPT ); Tue, 17 Mar 2020 20:25:23 -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 37F9D504; Wed, 18 Mar 2020 01:25:21 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1584491121; bh=skEXzsL2tu5WrqhmZAQxofau2ZISmajSMYp+88epHKw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oQPUa8niciD1Dkjg12LTGoVyVPJKhBC8j11BU4wJthnmQdyOalA4ZS28Ihv6VH8Mk w2FG7LIcnEWN5tSXtYJTqcAHiCa4wEJQJhbe7zMCr+nCTqTGMJYapN/N2Md56OSSLy 6zCE3Zh1Y5isYg2ZZmr+A4+0nq5PPj8hV2ZwHK10= 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 1/4] media: v4l2-async: Accept endpoints and devices for fwnode matching Date: Wed, 18 Mar 2020 02:25:04 +0200 Message-Id: <20200318002507.30336-2-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 fwnode matching was designed to match on nodes corresponding to a device. Some drivers, however, needed to match on endpoints, and have passed endpoint fwnodes to v4l2-async. This works when both the subdev and the notifier use the same fwnode types (endpoint or device), but makes drivers that use different types incompatible. Fix this by extending the fwnode match to handle fwnodes of different types. When the types (deduced from the node name) are different, retrieve the device fwnode for the side that provides an endpoint fwnode, and compare it with the device fwnode provided by the other side. This allows interoperability between all drivers, regardless of which type of fwnode they use for matching. Signed-off-by: Laurent Pinchart Tested-by: Lad Prabhakar Reviewed-by: Kieran Bingham --- drivers/media/v4l2-core/v4l2-async.c | 42 +++++++++++++++++++++++++++- 1 file changed, 41 insertions(+), 1 deletion(-) diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 8bde33c21ce4..995e5464cba7 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -71,7 +71,47 @@ static bool match_devname(struct v4l2_subdev *sd, static bool match_fwnode(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd) { - return sd->fwnode == asd->match.fwnode; + struct fwnode_handle *other_fwnode; + struct fwnode_handle *dev_fwnode; + bool asd_fwnode_is_ep; + bool sd_fwnode_is_ep; + const char *name; + + /* + * Both the subdev and the async subdev can provide either an endpoint + * fwnode or a device fwnode. Start with the simple case of direct + * fwnode matching. + */ + if (sd->fwnode == asd->match.fwnode) + return true; + + /* + * Otherwise, check if the sd fwnode and the asd fwnode refer to an + * endpoint or a device. If they're of the same type, there's no match. + */ + name = fwnode_get_name(sd->fwnode); + sd_fwnode_is_ep = name && strstarts(name, "endpoint"); + name = fwnode_get_name(asd->match.fwnode); + asd_fwnode_is_ep = name && strstarts(name, "endpoint"); + + if (sd_fwnode_is_ep == asd_fwnode_is_ep) + return false; + + /* + * The sd and asd fwnodes are of different types. Get the device fwnode + * parent of the endpoint fwnode, and compare it with the other fwnode. + */ + if (sd_fwnode_is_ep) { + dev_fwnode = fwnode_graph_get_port_parent(sd->fwnode); + other_fwnode = asd->match.fwnode; + } else { + dev_fwnode = fwnode_graph_get_port_parent(asd->match.fwnode); + other_fwnode = sd->fwnode; + } + + fwnode_handle_put(dev_fwnode); + + return dev_fwnode == other_fwnode; } static bool match_custom(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)