From mboxrd@z Thu Jan 1 00:00:00 1970 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 8F548C433EF for ; Wed, 15 Jun 2022 22:38:57 +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:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=9AWMD4z2XodNw0VVWk8HLQaXz4hb5Yzb1gwc1P55ve0=; b=l9SMKf3K31Sf+A G+wTweCBjlZuic6utmVrxzKBchXkNTeZSnmxGN/TbQyZbw628nzhwSoH0It5XwBQeNOvQ+t3IwmjO DglkdzVsJO2OO3ouQFU3dcZqX8zOSUiH8Nj13ISTv6oL70qFOemxjOKncB9YPOgWSH0VHXEXKOy8K UoEvIUmBkk+zv2+ljh8jsAd+Q/4+DuPWZi2T8UoyQzF+JLfqJxt2vwOpKMFKgTpeJXZ9Y4P3XF1Dm hrLEEW62XTlWrCNlapfSysqF9T7BbV4LcEkELEbq4MqYGqlEsBQTz0hXkXDp0MTYjHNVSXw2jJllq lv/hTUmDPiTlIi9WsHcA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o1bev-00GhnZ-6V; Wed, 15 Jun 2022 22:38:45 +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 1o1ber-00Ghn1-Uv for linux-rockchip@lists.infradead.org; Wed, 15 Jun 2022 22:38:43 +0000 Received: from pendragon.ideasonboard.com (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 2647C415; Thu, 16 Jun 2022 00:38:40 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1655332720; bh=l3+8xMOJlpi7aNGHzxKvolg3yAiTzQK/YUxYygUsGvM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=bN7fqeSn9/OgOGf50eohjaGEuJFicP4EEYPHa5x7MKgJVbGnxMGxsvNAj1F6AlA0a MyQD42Zw7fCZY+jSen4bMnsKw9DE/h4b0YO2aogq8EnloNycOCHDkwHzVY4rFSTDi8 lqNBoBcuCagcZGKOABLmgTEM/cosAU+IPU7EVIl8= Date: Thu, 16 Jun 2022 01:38:30 +0300 From: Laurent Pinchart To: Paul Elder Cc: linux-media@vger.kernel.org, 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, Sakari Ailus , Hans Verkuil Subject: Re: [PATCH 38/55] media: mc-entity: Add a new helper function to get a remote pad for a pad Message-ID: References: <20220614191127.3420492-1-paul.elder@ideasonboard.com> <20220614191127.3420492-39-paul.elder@ideasonboard.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220614191127.3420492-39-paul.elder@ideasonboard.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220615_153842_187828_30FA5EFA X-CRM114-Status: GOOD ( 25.13 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org + Sakari and Hans On Wed, Jun 15, 2022 at 04:11:10AM +0900, Paul Elder wrote: > 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 > --- > 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 > -- > 2.30.2 > -- Regards, Laurent Pinchart _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip