From patchwork Thu Jul 7 09:59:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 12909291 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 59B84C43334 for ; Thu, 7 Jul 2022 10:00:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=DsrAyd46cOBfriQpVUiOAA/CKwjdYAYqCHAKAmwPehg=; b=n8ZZ5U+5rt4UdU VWGGHpCqK+es+RyWbYpCLnSNC50J+j1xPIPtwsFH0PPH/m8mehGPthRvTyq6tgvTWdYxuQNh6RyQ6 D3riY1r6ct/MAX2O+NLA5lNvWdQRACzceTVwpzcJGXO2KQDoLvT+xkjLCHG9+MH9qvm0HHw8+Vy8O lB5b/Al0D3+VqW+I8p9LVU4x+K/57KFBiWZF1e1m/4pLeBq/W9hegyUmAhg4jlPUHwcqv8ELpE+k+ veyQ4RF4+t4YTDmbkXvUTyBp1ROL3Zem3dGb2M3J/fRhdxvJGhYFIhwNuBuNpQr1Ec9SHgUZhw6Gh HPLltPhDH/v2HfuzkywA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o9OJ8-00FUYB-3f; Thu, 07 Jul 2022 10:00:26 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o9OJ4-00FUWP-UC for linux-rockchip@lists.infradead.org; Thu, 07 Jul 2022 10:00:24 +0000 Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 03369326; Thu, 7 Jul 2022 12:00:20 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1657188021; bh=HMyAsoWABtj3GSAqSXnx09nXmT4MIFWyFZBOl5ORMuY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=igm6TDf24LDT5cCja8CVY8Rw1AKdwywraeZGD5ku4oSqqyidyYrriRpv/VvboSgSn emYq7u0njuJhI8WVIZCXHoVdcHTtJ6eOBLf9fzpp8dyFQFKMKMKbtGvYNb5GzhjOU8 Eex1kUow1xzTrnGbTh76b+ZX5hewHKsHcRiUNgrA= 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 v2.1 04/55] media: mc-entity: Add a new helper function to get a remote pad for a pad Date: Thu, 7 Jul 2022 12:59:51 +0300 Message-Id: <20220707095952.6831-1-laurent.pinchart@ideasonboard.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220630230713.10580-5-laurent.pinchart@ideasonboard.com> References: <20220630230713.10580-5-laurent.pinchart@ideasonboard.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220707_030023_168236_78DD3A6A X-CRM114-Status: GOOD ( 15.53 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org The newly added media_entity_remote_source_pad_unique() 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_unique(), but on a given pad instead of on the entity. Signed-off-by: Laurent Pinchart Acked-by: Hans Verkuil --- Changes since v2: - Update commit message 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