From patchwork Tue Jun 14 19:11:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Elder X-Patchwork-Id: 12881472 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 3CDD2C433EF for ; Tue, 14 Jun 2022 19:14:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357517AbiFNTOY (ORCPT ); Tue, 14 Jun 2022 15:14:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55622 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357611AbiFNTOX (ORCPT ); Tue, 14 Jun 2022 15:14:23 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB61111C0F for ; Tue, 14 Jun 2022 12:14:22 -0700 (PDT) Received: from pyrite.rasen.tech (softbank036240126034.bbtec.net [36.240.126.34]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 34FF7EF1; Tue, 14 Jun 2022 21:14:17 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1655234061; bh=GIhvJxxbVqRLcGeLL6GwJpK7d1zU0sA9adbgCCbIZhs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WTlRkEcQmW6qIbNKJqv/Dmifftm/pXUbiAn3xBWjck2hsFIdCokVM+B5+ots8+LW3 FdAdslsFhhEYYnu9g1O7EwhQVjnQhP0zWzSrJ2BZcIlrEL4z971KBs/RmK0Va4sO0k P0J5fmM6QI20HUnfABdR5sPPfpH2/78dfDJcxGzg= From: Paul Elder To: linux-media@vger.kernel.org Cc: Laurent Pinchart , dafna@fastmail.com, heiko@sntech.de, jeanmichel.hautbois@ideasonboard.com, jacopo@jmondi.org, djrscally@gmail.com, helen.koike@collabora.com, linux-rockchip@lists.infradead.org Subject: [PATCH 38/55] media: mc-entity: Add a new helper function to get a remote pad for a pad Date: Wed, 15 Jun 2022 04:11:10 +0900 Message-Id: <20220614191127.3420492-39-paul.elder@ideasonboard.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220614191127.3420492-1-paul.elder@ideasonboard.com> References: <20220614191127.3420492-1-paul.elder@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Laurent Pinchart 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() 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 --- Documentation/driver-api/media/mc-core.rst | 4 +-- drivers/media/mc/mc-entity.c | 31 ++++++++++++++++++++++ include/media/media-entity.h | 18 +++++++++++++ 3 files changed, 51 insertions(+), 2 deletions(-) diff --git a/Documentation/driver-api/media/mc-core.rst b/Documentation/driver-api/media/mc-core.rst index a2d1e32e3abb..83c3bdbf67be 100644 --- a/Documentation/driver-api/media/mc-core.rst +++ b/Documentation/driver-api/media/mc-core.rst @@ -186,8 +186,8 @@ 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_entity_remote_pad()` and -:c:func:`media_entity_remote_source_pad()`). +(:c:func:`media_entity_find_link()`, :c:func:`media_entity_remote_pad()`, +:c:func:`media_entity_remote_source_pad()` and :c:func:`media_pad_remote_pad()`). Use count and power handling ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c index 1febf5a86be6..6429b0510bfb 100644 --- a/drivers/media/mc/mc-entity.c +++ b/drivers/media/mc/mc-entity.c @@ -958,6 +958,37 @@ 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(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); + 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 33d5f52719a0..bfe6a7b10a68 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -904,6 +904,24 @@ media_entity_remote_source_pad(const struct media_entity *entity) return media_entity_remote_pad_unique(entity, MEDIA_PAD_FL_SOURCE); } +/** + * media_pad_remote_pad - 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(const struct media_pad *pad); + /** * media_entity_is_streaming - Test if an entity is part of a streaming pipeline * @entity: The entity