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 X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9DC97C4360F for ; Tue, 5 Mar 2019 18:52:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7B988208E4 for ; Tue, 5 Mar 2019 18:52:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728409AbfCESwD (ORCPT ); Tue, 5 Mar 2019 13:52:03 -0500 Received: from relay12.mail.gandi.net ([217.70.178.232]:40611 "EHLO relay12.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727536AbfCESwB (ORCPT ); Tue, 5 Mar 2019 13:52:01 -0500 Received: from uno.lan (2-224-242-101.ip172.fastwebnet.it [2.224.242.101]) (Authenticated sender: jacopo@jmondi.org) by relay12.mail.gandi.net (Postfix) with ESMTPSA id 76847200010; Tue, 5 Mar 2019 18:51:58 +0000 (UTC) From: Jacopo Mondi To: sakari.ailus@linux.intel.com, laurent.pinchart@ideasonboard.com, niklas.soderlund+renesas@ragnatech.se Cc: Jacopo Mondi , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v3 22/31] v4l: mc: Add an S_ROUTING helper function for power state changes Date: Tue, 5 Mar 2019 19:51:41 +0100 Message-Id: <20190305185150.20776-23-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190305185150.20776-1-jacopo+renesas@jmondi.org> References: <20190305185150.20776-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Sakari Ailus With the addition of the has_route() media entity operation, all pads of an entity are no longer interconnected. The S_ROUTING IOCTL for sub-devices can be used to enable and disable routes for an entity. The consequence is that the routing information has to be taken into account in use count calculation: disabling a route has a very similar effect on use counts as has disabling a link. Add a helper function for drivers implementing VIDIOC_SUBDEV_S_ROUTING IOCTL to take the change into account. Signed-off-by: Sakari Ailus Reviewed-by: Niklas Söderlund --- drivers/media/v4l2-core/v4l2-mc.c | 34 +++++++++++++++++++++++++++++++ include/media/v4l2-mc.h | 22 ++++++++++++++++++++ 2 files changed, 56 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-mc.c b/drivers/media/v4l2-core/v4l2-mc.c index 558dec225838..7a2536d3c75e 100644 --- a/drivers/media/v4l2-core/v4l2-mc.c +++ b/drivers/media/v4l2-core/v4l2-mc.c @@ -482,3 +482,37 @@ int v4l2_pipeline_link_notify(struct media_link *link, u32 flags, return ret; } EXPORT_SYMBOL_GPL(v4l2_pipeline_link_notify); + +int v4l2_subdev_routing_pm_use(struct media_entity *entity, + struct v4l2_subdev_route *route) +{ + struct media_graph *graph = + &entity->graph_obj.mdev->pm_count_walk; + struct media_pad *source = &entity->pads[route->source_pad]; + struct media_pad *sink = &entity->pads[route->sink_pad]; + int source_use; + int sink_use; + int ret; + + source_use = pipeline_pm_use_count(source, graph); + sink_use = pipeline_pm_use_count(sink, graph); + + if (!(route->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE)) { + /* Route disabled. */ + pipeline_pm_power(source, -sink_use, graph); + pipeline_pm_power(sink, -source_use, graph); + return 0; + } + + /* Route enabled. */ + ret = pipeline_pm_power(source, sink_use, graph); + if (ret < 0) + return ret; + + ret = pipeline_pm_power(sink, source_use, graph); + if (ret < 0) + pipeline_pm_power(source, -sink_use, graph); + + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_subdev_routing_pm_use); diff --git a/include/media/v4l2-mc.h b/include/media/v4l2-mc.h index bf5043c1ab6b..730922636579 100644 --- a/include/media/v4l2-mc.h +++ b/include/media/v4l2-mc.h @@ -26,6 +26,7 @@ /* We don't need to include pci.h or usb.h here */ struct pci_dev; struct usb_device; +struct v4l2_subdev_route; #ifdef CONFIG_MEDIA_CONTROLLER /** @@ -132,6 +133,22 @@ int v4l2_pipeline_pm_use(struct media_entity *entity, int use); int v4l2_pipeline_link_notify(struct media_link *link, u32 flags, unsigned int notification); +/** + * v4l2_subdev_routing_pm_use - Handle power state changes due to S_ROUTING + * @entity: The entity + * @route: The new state of the route + * + * Propagate the use count across a route in a pipeline whenever the + * route is enabled or disabled. The function is called before + * changing the route state when enabling a route, and after changing + * the route state when disabling a route. + * + * Return 0 on success or a negative error code on failure. Powering entities + * off is assumed to never fail. This function will not fail for disconnection + * events. + */ +int v4l2_subdev_routing_pm_use(struct media_entity *entity, + struct v4l2_subdev_route *route); #else /* CONFIG_MEDIA_CONTROLLER */ static inline int v4l2_mc_create_media_graph(struct media_device *mdev) @@ -164,5 +181,10 @@ static inline int v4l2_pipeline_link_notify(struct media_link *link, u32 flags, return 0; } +static inline int v4l2_subdev_routing_pm_use(struct media_entity *entity, + struct v4l2_subdev_route *route) +{ + return 0; +} #endif /* CONFIG_MEDIA_CONTROLLER */ #endif /* _V4L2_MC_H */ -- 2.20.1