From patchwork Thu Dec 22 22:42:26 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Machek X-Patchwork-Id: 9486929 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A37A3601C0 for ; Thu, 22 Dec 2016 22:42:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 981C927F8C for ; Thu, 22 Dec 2016 22:42:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8BE5827F99; Thu, 22 Dec 2016 22:42:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_TVD_MIME_EPI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E36CA27F8C for ; Thu, 22 Dec 2016 22:42:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966763AbcLVWmb (ORCPT ); Thu, 22 Dec 2016 17:42:31 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:44995 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756730AbcLVWma (ORCPT ); Thu, 22 Dec 2016 17:42:30 -0500 Received: by atrey.karlin.mff.cuni.cz (Postfix, from userid 512) id 8469782496; Thu, 22 Dec 2016 23:42:27 +0100 (CET) Date: Thu, 22 Dec 2016 23:42:26 +0100 From: Pavel Machek To: Sebastian Reichel Cc: Sakari Ailus , ivo.g.dimitrov.75@gmail.com, pali.rohar@gmail.com, linux-media@vger.kernel.org, galak@codeaurora.org, mchehab@osg.samsung.com, linux-kernel@vger.kernel.org Subject: Re: [RFC/PATCH] media: Add video bus switch Message-ID: <20161222224226.GB31151@amd> References: <20161023200355.GA5391@amd> <20161119232943.GF13965@valkosipuli.retiisi.org.uk> <20161214122451.GB27011@amd> <20161222100104.GA30917@amd> <20161222133938.GA30259@amd> <20161222143244.ykza4wdxmop2t7bg@earth> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20161222143244.ykza4wdxmop2t7bg@earth> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On Thu 2016-12-22 15:32:44, Sebastian Reichel wrote: > Hi Pavel, > > On Thu, Dec 22, 2016 at 02:39:38PM +0100, Pavel Machek wrote: > > N900 contains front and back camera, with a switch between the > > two. This adds support for the swich component. > > > > Signed-off-by: Sebastian Reichel > > Signed-off-by: Ivaylo Dimitrov > > Signed-off-by: Pavel Machek > > > > -- > > > > I see this needs dts documentation, anything else than needs to be > > done? > > Yes. This driver takes care of the switch gpio, but the cameras also > use different bus settings. Currently omap3isp gets the bus-settings > from the link connected to the CCP2 port in DT at probe time (*). > > So there are two general problems: > > 1. Settings must be applied before the streaming starts instead of > at probe time, since the settings may change (based one the selected > camera). That should be fairly easy to implement by just moving the > code to the s_stream callback as far as I can see. > > 2. omap3isp should try to get the bus settings from using a callback > in the connected driver instead of loading it from DT. Then the > video-bus-switch can load the bus-settings from its downstream links > in DT and propagate the correct ones to omap3isp based on the > selected port. The DT loading part should actually remain in omap3isp > as fallback, in case it does not find a callback in the connected driver. > That way everything is backward compatible and the DT variant is > nice for 1-on-1 scenarios. So... did I understood it correctly? (Needs some work to be done...) diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c index 45c69ed..1f44da1 100644 --- a/drivers/media/platform/omap3isp/isp.c +++ b/drivers/media/platform/omap3isp/isp.c @@ -702,6 +704,33 @@ static int isp_pipeline_enable(struct isp_pipeline *pipe, entity = &pipe->output->video.entity; while (1) { + struct v4l2_of_endpoint vep; + pad = &entity->pads[0]; + if (!(pad->flags & MEDIA_PAD_FL_SINK)) + break; + + pad = media_entity_remote_pad(pad); + if (!pad || !is_media_entity_v4l2_subdev(pad->entity)) + break; + + entity = pad->entity; + subdev = media_entity_to_v4l2_subdev(entity); + + printk("Entity = %p\n", entity); + ret = v4l2_subdev_call(subdev, video, g_endpoint_config, &vep); + /* Is there better method than walking a list? + Can I easily get dev and isd pointers here? */ +#if 0 + if (ret == 0) { + printk("success\n"); + /* notifier->subdevs[notifier->num_subdevs] ... contains isd */ + isp_endpoint_to_buscfg(dev, vep, isd->bus); + } +#endif + } + + entity = &pipe->output->video.entity; + while (1) { pad = &entity->pads[0]; if (!(pad->flags & MEDIA_PAD_FL_SINK)) break; @@ -2099,27 +2128,8 @@ static void isp_of_parse_node_csi2(struct device *dev, buscfg->bus.csi2.crc = 1; } -static int isp_of_parse_node_endpoint(struct device *dev, - struct device_node *node, - struct isp_async_subdev *isd) +static int isp_endpoint_to_buscfg(struct device *dev, struct v4l2_of_endpoint vep, struct isp_bus_cfg *buscfg) { - struct isp_bus_cfg *buscfg; - struct v4l2_of_endpoint vep; - int ret; - - isd->bus = devm_kzalloc(dev, sizeof(*isd->bus), GFP_KERNEL); - if (!isd->bus) - return -ENOMEM; - - buscfg = isd->bus; - - ret = v4l2_of_parse_endpoint(node, &vep); - if (ret) - return ret; - - dev_dbg(dev, "parsing endpoint %s, interface %u\n", node->full_name, - vep.base.port); - switch (vep.base.port) { case ISP_OF_PHY_PARALLEL: buscfg->interface = ISP_INTERFACE_PARALLEL; @@ -2147,10 +2157,35 @@ static int isp_of_parse_node_endpoint(struct device *dev, break; default: + return -1; + } + return 0; +} + +static int isp_of_parse_node_endpoint(struct device *dev, + struct device_node *node, + struct isp_async_subdev *isd) +{ + struct isp_bus_cfg *buscfg; + struct v4l2_of_endpoint vep; + int ret; + + isd->bus = devm_kzalloc(dev, sizeof(*isd->bus), GFP_KERNEL); + if (!isd->bus) + return -ENOMEM; + + buscfg = isd->bus; + + ret = v4l2_of_parse_endpoint(node, &vep); + if (ret) + return ret; + + dev_dbg(dev, "parsing endpoint %s, interface %u\n", node->full_name, + vep.base.port); + + if (isp_endpoint_to_buscfg(dev, vep, buscfg)) dev_warn(dev, "%s: invalid interface %u\n", node->full_name, vep.base.port); - break; - } return 0; } @@ -2262,6 +2297,10 @@ static int isp_of_parse_nodes(struct device *dev, } return notifier->num_subdevs; + +error: + of_node_put(node); + return -EINVAL; } static int isp_subdev_notifier_bound(struct v4l2_async_notifier *async, diff --git a/drivers/media/platform/video-bus-switch.c b/drivers/media/platform/video-bus-switch.c index 1a5d944..3a2d442 100644 --- a/drivers/media/platform/video-bus-switch.c +++ b/drivers/media/platform/video-bus-switch.c @@ -247,12 +247,21 @@ static int vbs_s_stream(struct v4l2_subdev *sd, int enable) { struct v4l2_subdev *subdev = vbs_get_remote_subdev(sd); + /* FIXME: we need to set the GPIO here */ + if (IS_ERR(subdev)) return PTR_ERR(subdev); return v4l2_subdev_call(subdev, video, s_stream, enable); } +static int vbs_g_endpoint_config(struct v4l2_subdev *sd, struct isp_bus_cfg *cfg) +{ + printk("vbs_g_endpoint_config...\n"); + return 0; +} + + static const struct v4l2_subdev_internal_ops vbs_internal_ops = { .registered = &vbs_registered, }; @@ -265,6 +274,7 @@ static const struct media_entity_operations vbs_media_ops = { /* subdev video operations */ static const struct v4l2_subdev_video_ops vbs_video_ops = { .s_stream = vbs_s_stream, + .g_endpoint_config = vbs_g_endpoint_config, }; static const struct v4l2_subdev_ops vbs_ops = { diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index cf778c5..30457b0 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -415,6 +415,8 @@ struct v4l2_subdev_video_ops { const struct v4l2_mbus_config *cfg); int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf, unsigned int *size); + int (*g_endpoint_config)(struct v4l2_subdev *sd, + struct v4l2_of_endpoint *cfg); }; /**