From patchwork Sun Jun 21 00:00:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 11616331 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 824AD1731 for ; Sun, 21 Jun 2020 00:01:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69CEF23357 for ; Sun, 21 Jun 2020 00:01:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="F7bKlPOJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728491AbgFUAA7 (ORCPT ); Sat, 20 Jun 2020 20:00:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728434AbgFUAA6 (ORCPT ); Sat, 20 Jun 2020 20:00:58 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B157CC061795; Sat, 20 Jun 2020 17:00:58 -0700 (PDT) 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 BFE01592; Sun, 21 Jun 2020 02:00:56 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1592697657; bh=O1ltYh6zXG8WLWSDt9TPfxvCPm+nzVcdHlxJlX6nGns=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=F7bKlPOJeAMXD013149I+szSHDlsi/g6MHjr9pb5NTTnSmrdAZNx9ZbcaCkF54Ujc F6C5VUSEyRfrQyt/m7sjq7viuMcIRetITX+lpmtDGcycYBaMdeThvgXTjaDcCR5V28 NHtnkvdjc7M2lUgdTSfCCndfAZvO/7jXDRpC2lnE= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Sakari Ailus , Jacopo Mondi , =?utf-8?q?Niklas_S=C3=B6derlund?= , Kieran Bingham , Lad Prabhakar Subject: [PATCH v3 1/3] media: v4l2-async: Accept endpoints and devices for fwnode matching Date: Sun, 21 Jun 2020 03:00:26 +0300 Message-Id: <20200621000028.4591-2-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200621000028.4591-1-laurent.pinchart+renesas@ideasonboard.com> References: <20200621000028.4591-1-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 presence of remote endpoints) 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 Reviewed-by: Jacopo Mondi --- Changes since v2: - Add comment to explain that we're matching connecting endpoints - Don't check fwnode name to detect endpoint --- drivers/media/v4l2-core/v4l2-async.c | 45 +++++++++++++++++++++++++++- 1 file changed, 44 insertions(+), 1 deletion(-) diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 8bde33c21ce4..f82e0a32647d 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -71,7 +71,50 @@ 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; + + /* + * 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. + * Technically speaking this checks if the nodes refer to a connected + * endpoint, which is the simplest check that works for both OF and + * ACPI. This won't make a difference, as drivers should not try to + * match unconnected endpoints. + */ + sd_fwnode_is_ep = fwnode_property_present(sd->fwnode, + "remote-endpoint"); + asd_fwnode_is_ep = fwnode_property_present(asd->match.fwnode, + "remote-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)