From patchwork Thu Jun 30 23:06:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 586242 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25248C43334 for ; Thu, 30 Jun 2022 23:07:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230476AbiF3XH5 (ORCPT ); Thu, 30 Jun 2022 19:07:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55104 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229799AbiF3XH4 (ORCPT ); Thu, 30 Jun 2022 19:07:56 -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 88B7B57239 for ; Thu, 30 Jun 2022 16:07:52 -0700 (PDT) Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id A4FCF832; Fri, 1 Jul 2022 01:07:39 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1656630460; bh=j+3ZrtP0d8WL1IFfwyhIbmDB62PiXxGJI5Umbm5Fudo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PEsmZ0z3mE2xA/IcSEhg998oDR2vt7YeYqIUuvCEWk2jxX1PvpQac8+Y8/6rkBmPa gqxtDt9PBPaWzElCKXy5Pda1RSka2/03/s2FMliC+cfUv35oRtriNwN7epFVNyZviB qg4FonpoLesYJg4xTX0i0HlS8pq1M+f5xDMNJOoQ= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-rockchip@lists.infradead.org, Dafna Hirschfeld , Heiko Stuebner , Helen Koike , Paul Elder , Sakari Ailus , Hans Verkuil Subject: [PATCH v2 04/55] media: mc-entity: Add a new helper function to get a remote pad for a pad Date: Fri, 1 Jul 2022 02:06:22 +0300 Message-Id: <20220630230713.10580-5-laurent.pinchart@ideasonboard.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220630230713.10580-1-laurent.pinchart@ideasonboard.com> References: <20220630230713.10580-1-laurent.pinchart@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The newly added media_entity_remote_source_pad() helper function handles use cases where the entity has a link enabled uniqueness constraint covering all pads. There are use cases where the constraint covers a specific pad only. Add a new media_pad_remote_pad_unique() function to handle this. It operates as media_entity_remote_source_pad(), but on a given pad instead of on the entity. Signed-off-by: Laurent Pinchart Acked-by: Hans Verkuil --- Changes since v1: - Rename media_pad_remote_pad() to media_pad_remote_pad_unique() --- Documentation/driver-api/media/mc-core.rst | 5 ++-- drivers/media/mc/mc-entity.c | 31 ++++++++++++++++++++++ include/media/media-entity.h | 18 +++++++++++++ 3 files changed, 52 insertions(+), 2 deletions(-) diff --git a/Documentation/driver-api/media/mc-core.rst b/Documentation/driver-api/media/mc-core.rst index 66801506b2dd..644911936ad9 100644 --- a/Documentation/driver-api/media/mc-core.rst +++ b/Documentation/driver-api/media/mc-core.rst @@ -186,8 +186,9 @@ is required and the graph structure can be freed normally. Helper functions can be used to find a link between two given pads, or a pad connected to another pad through an enabled link -(:c:func:`media_entity_find_link()`, :c:func:`media_pad_remote_pad_first()` and -:c:func:`media_entity_remote_source_pad_unique()`). +(:c:func:`media_entity_find_link()`, :c:func:`media_pad_remote_pad_first()`n +:c:func:`media_entity_remote_source_pad_unique()` and +:c:func:`media_pad_remote_pad_unique()`). Use count and power handling ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c index bd7145932137..7082403d5800 100644 --- a/drivers/media/mc/mc-entity.c +++ b/drivers/media/mc/mc-entity.c @@ -960,6 +960,37 @@ media_entity_remote_pad_unique(const struct media_entity *entity, } EXPORT_SYMBOL_GPL(media_entity_remote_pad_unique); +struct media_pad *media_pad_remote_pad_unique(const struct media_pad *pad) +{ + struct media_pad *found_pad = NULL; + struct media_link *link; + + list_for_each_entry(link, &pad->entity->links, list) { + struct media_pad *remote_pad; + + if (!(link->flags & MEDIA_LNK_FL_ENABLED)) + continue; + + if (link->sink == pad) + remote_pad = link->source; + else if (link->source == pad) + remote_pad = link->sink; + else + continue; + + if (found_pad) + return ERR_PTR(-ENOTUNIQ); + + found_pad = remote_pad; + } + + if (!found_pad) + return ERR_PTR(-ENOLINK); + + return found_pad; +} +EXPORT_SYMBOL_GPL(media_pad_remote_pad_unique); + static void media_interface_init(struct media_device *mdev, struct media_interface *intf, u32 gobj_type, diff --git a/include/media/media-entity.h b/include/media/media-entity.h index aecd1691b297..cd0690cff4c2 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -859,6 +859,24 @@ struct media_link *media_entity_find_link(struct media_pad *source, */ struct media_pad *media_pad_remote_pad_first(const struct media_pad *pad); +/** + * media_pad_remote_pad_unique - Find a remote pad connected to a pad + * @pad: The pad + * + * Search for and return a remote pad connected to @pad through an enabled + * link. If multiple (or no) remote pads are found, an error is returned. + * + * The uniqueness constraint makes this helper function suitable for entities + * that support a single active source at a time on a given pad. + * + * Return: A pointer to the remote pad, or one of the following error pointers + * if an error occurs: + * + * * -ENOTUNIQ - Multiple links are enabled + * * -ENOLINK - No connected pad found + */ +struct media_pad *media_pad_remote_pad_unique(const struct media_pad *pad); + /** * media_entity_remote_pad_unique - Find a remote pad connected to an entity * @entity: The entity