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[23.128.96.18]) by mx.google.com with ESMTP id e15si16512693edq.435.2020.06.26.04.53.22; Fri, 26 Jun 2020 04:53:45 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727917AbgFZK3A (ORCPT + 99 others); Fri, 26 Jun 2020 06:29:00 -0400 Received: from smtp1.de.adit-jv.com ([93.241.18.167]:38478 "EHLO smtp1.de.adit-jv.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726384AbgFZK27 (ORCPT ); Fri, 26 Jun 2020 06:28:59 -0400 Received: from localhost (smtp1.de.adit-jv.com [127.0.0.1]) by smtp1.de.adit-jv.com (Postfix) with ESMTP id 7727F3C0585; Fri, 26 Jun 2020 12:28:55 +0200 (CEST) Received: from smtp1.de.adit-jv.com ([127.0.0.1]) by localhost (smtp1.de.adit-jv.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jI0BiUiwz0EU; Fri, 26 Jun 2020 12:28:50 +0200 (CEST) Received: from HI2EXCH01.adit-jv.com (hi2exch01.adit-jv.com [10.72.92.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by smtp1.de.adit-jv.com (Postfix) with ESMTPS id 9B1853C04C1; Fri, 26 Jun 2020 12:28:50 +0200 (CEST) Received: from vmlxhi-110.adit-jv.com (10.72.93.196) by HI2EXCH01.adit-jv.com (10.72.92.24) with Microsoft SMTP Server (TLS) id 14.3.487.0; Fri, 26 Jun 2020 12:28:50 +0200 Date: Fri, 26 Jun 2020 12:28:45 +0200 From: Ramzi Ben Meftah To: Hans Verkuil CC: Ramzi Ben Meftah , Laurent Pinchart , Jacopo Mondi , niklas soderlund , Kieran Bingham , Mauro Carvalho Chehab , Hans Verkuil , Sakari Ailus , Janusz Krzysztofik , Steve Longerbeam , Ezequiel Garcia , Arnd Bergmann , , , Michael Rodin , , Subject: Re: [PATCH 1/3] v4l2-subdev: Add subdev ioctl support for ENUM/GET/SET INPUT Message-ID: <20200626102832.GA89964@vmlxhi-110.adit-jv.com> References: <1592301619-17631-1-git-send-email-rbmeftah@de.adit-jv.com> <20200624075307.hl6wew7vr5ue225t@uno.localdomain> <20200625020138.GW5980@pendragon.ideasonboard.com> <20200625093046.GA91893@vmlxhi-110.adit-jv.com> <20200625094724.GE5865@pendragon.ideasonboard.com> <20200625101835.GA5081@vmlxhi-110.adit-jv.com> <20200625102701.GG5865@pendragon.ideasonboard.com> <20200626090913.GA1348@vmlxhi-110.adit-jv.com> <722b67b4-05a3-5785-0196-15bf5466c981@xs4all.nl> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <722b67b4-05a3-5785-0196-15bf5466c981@xs4all.nl> User-Agent: Mutt/1.5.24 (2015-08-30) X-Originating-IP: [10.72.93.196] Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 26, 2020 at 11:25:31AM +0200, Hans Verkuil wrote: > On 26/06/2020 11:09, Ramzi Ben Meftah wrote: > > Hi Laurent, Hans, > > > > On Thu, Jun 25, 2020 at 12:35:02PM +0200, Hans Verkuil wrote: > >> On 25/06/2020 12:29, Laurent Pinchart wrote: > >>> Hi Ramzi, > >>> > >>> On Thu, Jun 25, 2020 at 12:18:35PM +0200, Ramzi Ben Meftah wrote: > >>>> On Thu, Jun 25, 2020 at 12:47:24PM +0300, Laurent Pinchart wrote: > >>>>> On Thu, Jun 25, 2020 at 11:30:46AM +0200, Ramzi Ben Meftah wrote: > >>>>>> On Thu, Jun 25, 2020 at 05:01:38AM +0300, Laurent Pinchart wrote: > >>>>>>> On Wed, Jun 24, 2020 at 09:53:07AM +0200, Jacopo Mondi wrote: > >>>>>>>> On Tue, Jun 16, 2020 at 12:00:15PM +0200, Ramzi BEN MEFTAH wrote: > >>>>>>>>> From: Steve Longerbeam > >>>>>>>> > >>>>>>>> +Niklas, +Laurent > >>>>>>>> > >>>>>>>> Niklas, Laurent, how does this play with CAP_IO_MC ? > >>>>>>> > >>>>>>> I don't think it's related to CAP_IO_MC, but I don't think it's a good > >>>>>>> idea either :-) Routing doesn't go through the subdev [gs]_input > >>>>>>> operations in MC-based drivers. It should be configured through link > >>>>>>> setup instead. This patch goes in the wrong direction, sorry Steve. > >>>>>> > >>>>>> ENUMINPUT ioctl allow to get the input signal status. Is there an alternative > >>>>>> with Media Controller? > >>>>> > >>>>> No there isn't at the moment. I'm not opposed to adding such a feature, > >>>>> but VIDIOC_ENUMINPUT isn't the right choice. This would have to be a > >>>>> subdev pad operation (v4l2_subdev_pad_ops), not a video operation > >>>>> (v4l2_subdev_video_ops). We also likely shouldn't call it "enum" input, > >>>>> as it would retrieve properties of the input corresponding to the pad, > >>>>> not enumerate inputs. > >>>> > >>>> Looking to v4l2_subdev_pad_ops, there is g_input_status which seems to fulfill > >>>> this need. But, seems this is not expose to user space although many drivers > >>>> do implememt it. > >>>> Should I add VIDIOC_SUBDEV_G_INPUT_STATUS? > >>> > >>> Isn't g_input_status a video operation ? I would propose adding a > >>> g_input_status pad operation, and expose that to userspace. We should > >>> take that as an opportunity to consider designing that new operation > >>> from scratch (possibly naming it differently) and make sure it could > >>> address both analog and digital systems (for instance being able to > >>> report the status of an SDI input). > > > > Sorry, my mistake. But, does it make sens that it belongs to video ops? > > I think it should be part of pad ops, it is used now as alternative to > > ENUMINPUT and we agreed that it should(if we are going to implement it) be > > part of pad ops. > > > >> > >> Yes, I was wondering the same. The status bits are ancient and we might > >> want to improve on it. > >> > >> Ramzi, what exactly is your use-case? Is this for an HDMI input? Analog > >> video input? Before adding a new ioctl I'd like to know why you think > >> you need it :-) > > > > I need to know if the input signal(analog and digital) is there, before > > starting streaming. I am not aware of other way to check for it. > > You can check for digital timings using QUERY_DV_TIMINGS: it will return an > error if there is no lock. Subscribe to the SOURCE_CHANGE event to know when > the signal is found/lost. > > For analog timings you have QUERYSTD and the same event. The main limitation > with analog (SDTV) video receivers is that not all analog receivers have implemented > this event. But the adv7180 and tvp5150 do support this. > > This is the recommended way of implementing this and it has the advantage of > being interrupt-driven, so no need to poll for a status in the application. Thank you Hans, things are clear now. > > Regards, > > Hans > > > > >> > >> Regards, > >> > >> Hans > >> > >>> > >>>>>>>>> This commit enables VIDIOC_ENUMINPUT, VIDIOC_G_INPUT, and VIDIOC_S_INPUT > >>>>>>>>> ioctls for use via v4l2 subdevice node. > >>>>>>>>> > >>>>>>>>> This commit should probably not be pushed upstream, because the (old) > >>>>>>>>> idea of video inputs conflicts with the newer concept of establishing > >>>>>>>>> media links between src->sink pads. > >>>>>>>>> > >>>>>>>>> However it might make sense for some subdevices to support enum/get/set > >>>>>>>>> inputs. One example would be the analog front end subdevice for the > >>>>>>>>> ADV748x. By providing these ioctls, selecting the ADV748x analog inputs > >>>>>>>>> can be done without requiring the implementation of media entities that > >>>>>>>>> would define the analog source for which to establish a media link. > >>>>>>>>> > >>>>>>>>> Signed-off-by: Steve Longerbeam > >>>>>>>>> --- > >>>>>>>>> drivers/media/v4l2-core/v4l2-subdev.c | 9 +++++++++ > >>>>>>>>> include/media/v4l2-subdev.h | 11 +++++++++++ > >>>>>>>>> 2 files changed, 20 insertions(+) > >>>>>>>>> > >>>>>>>>> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c > >>>>>>>>> index 6b989fe..73fbfe9 100644 > >>>>>>>>> --- a/drivers/media/v4l2-core/v4l2-subdev.c > >>>>>>>>> +++ b/drivers/media/v4l2-core/v4l2-subdev.c > >>>>>>>>> @@ -378,6 +378,15 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) > >>>>>>>>> return -ENOTTY; > >>>>>>>>> return v4l2_querymenu(vfh->ctrl_handler, arg); > >>>>>>>>> > >>>>>>>>> + case VIDIOC_ENUMINPUT: > >>>>>>>>> + return v4l2_subdev_call(sd, video, enuminput, arg); > >>>>>>>>> + > >>>>>>>>> + case VIDIOC_G_INPUT: > >>>>>>>>> + return v4l2_subdev_call(sd, video, g_input, arg); > >>>>>>>>> + > >>>>>>>>> + case VIDIOC_S_INPUT: > >>>>>>>>> + return v4l2_subdev_call(sd, video, s_input, *(u32 *)arg); > >>>>>>>>> + > >>>>>>>>> case VIDIOC_G_CTRL: > >>>>>>>>> if (!vfh->ctrl_handler) > >>>>>>>>> return -ENOTTY; > >>>>>>>>> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h > >>>>>>>>> index f7fe78a..6e1a9cd 100644 > >>>>>>>>> --- a/include/media/v4l2-subdev.h > >>>>>>>>> +++ b/include/media/v4l2-subdev.h > >>>>>>>>> @@ -383,6 +383,14 @@ struct v4l2_mbus_frame_desc { > >>>>>>>>> * @g_input_status: get input status. Same as the status field in the > >>>>>>>>> * &struct &v4l2_input > >>>>>>>>> * > >>>>>>>>> + * @enuminput: enumerate inputs. Should return the same input status as > >>>>>>>>> + * @g_input_status if the passed input index is the currently active > >>>>>>>>> + * input. > >>>>>>>>> + * > >>>>>>>>> + * @g_input: returns the currently active input index. > >>>>>>>>> + * > >>>>>>>>> + * @s_input: set the active input. > >>>>>>>>> + * > >>>>>>>>> * @s_stream: used to notify the driver that a video stream will start or has > >>>>>>>>> * stopped. > >>>>>>>>> * > >>>>>>>>> @@ -423,6 +431,9 @@ struct v4l2_subdev_video_ops { > >>>>>>>>> int (*g_tvnorms)(struct v4l2_subdev *sd, v4l2_std_id *std); > >>>>>>>>> int (*g_tvnorms_output)(struct v4l2_subdev *sd, v4l2_std_id *std); > >>>>>>>>> int (*g_input_status)(struct v4l2_subdev *sd, u32 *status); > >>>>>>>>> + int (*enuminput)(struct v4l2_subdev *sd, struct v4l2_input *input); > >>>>>>>>> + int (*g_input)(struct v4l2_subdev *sd, u32 *index); > >>>>>>>>> + int (*s_input)(struct v4l2_subdev *sd, u32 index); > >>>>>>>>> int (*s_stream)(struct v4l2_subdev *sd, int enable); > >>>>>>>>> int (*g_pixelaspect)(struct v4l2_subdev *sd, struct v4l2_fract *aspect); > >>>>>>>>> int (*g_frame_interval)(struct v4l2_subdev *sd, > >>> > >> > > > -- Best Regards, Ramzi Ben Meftah.