From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 136283B2FF7; Wed, 15 Jul 2026 16:31:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784133071; cv=none; b=HPFvnNHyQphkTPT1KZLeZixQqdWDMUD5ldWWv3M8eXeNsefPmVqinj0+aWC8/vwQvzAYNb9did8pCKpuviEE0hJeebBs4RBGuqD/GvynDmBhELnjM5Unar1mqiz2zAXEN5lymFKaDynRT0shPHFw1aTwTg82nkFKblwz1jX0v5Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784133071; c=relaxed/simple; bh=t6vi0d9j++m6IYVRVYyMG9I+Iee5lzlCy+xmrkv2HfU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=o1SwUkH1CoAA5IWUkr/ackgsZdRkdHmA0v9i8M27KnEMT5dSkFA/9jiQBYBf6nf5maoI/ONvQxhjEkufdJsiThhDB2k0bwDUAqyoshXGTPGJfI2NUioTx+QbkzpPF28DXf6QunDzPLbBpQtKp4PaDEU4aIdqcLAACjrGSpDbSaw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=YfPgH/x6; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="YfPgH/x6" Received: from killaraus.ideasonboard.com (2001-14ba-70f3-e800--a06.rev.dnainternet.fi [IPv6:2001:14ba:70f3:e800::a06]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id D623E12D6; Wed, 15 Jul 2026 18:30:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1784133013; bh=t6vi0d9j++m6IYVRVYyMG9I+Iee5lzlCy+xmrkv2HfU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=YfPgH/x63QeJLS/S6VZnBF48yadyRYQmeu1QjZprd+y9qcPqwQZSrUWz1hfWPUy4O TmCgl+1uh3rrca3mia/DJudfbzP2NXpXHBHHTZyirw95Tt0Nrb+8wUsMZyDWhVUAQR iLEGwvo+tHQDyCodpCAShLBux3ins9TOQXxh2XPA= Date: Wed, 15 Jul 2026 19:31:06 +0300 From: Laurent Pinchart To: Svyatoslav Ryhel Cc: Sakari Ailus , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v1 1/1 RESEND] media: i2c: mt9m114: Add get_fwnode_pad operation for IFP Message-ID: <20260715163106.GG1778116@killaraus.ideasonboard.com> References: <20260625082111.47898-1-clamor95@gmail.com> <20260625082111.47898-2-clamor95@gmail.com> <20260714191637.GA1675278@killaraus.ideasonboard.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Wed, Jul 15, 2026 at 07:18:18PM +0300, Svyatoslav Ryhel wrote: > вт, 14 лип. 2026 р. о 22:16 Laurent Pinchart пише: > > On Thu, Jun 25, 2026 at 11:21:11AM +0300, Svyatoslav Ryhel wrote: > > > Currently, the driver's binding exposes only one endpoint, which maps to > > > the IFP subdevice's SOURCE pad. This configuration causes failures for > > > many devices using this camera because both the DT binding and the > > > one-to-one pad mapping logic map the endpoint to the wrong pad. > > > > Could you please explain what failures this causes ? A brief analysis of > > the code seems to indicate the patch will only make a difference when > > the DT node has multiple endpoints, and will prevent links to be created > > for any endpoint but the first one. I don't think that's desirable. > > OF schema documents only a single port with a single endpoint. Since > driver has no alternative OF matching logic endpoints patch to media > pads one-to-one. IFP has 2 pads, id 0 is sink and id 1 is source. So > according to one-to-one match endpoint from the binding co-responds to > the sink media pad of IFP, source pad which is usually used to build > the video pipe is not represented in the bindings entirely. But the mt9m114 driver doesn't use 1-to-1 matching, it does not use the v4l2_subdev_get_fwnode_pad_1_to_1() function to implement .get_fwnode_pad(). > This causes drivers which relay on OF bindings to build their video pipes > fail to work with this driver. Could you provide an example of such a failure ? > Sakari suggested this to fix OF > matching, so I have implemented it. > > > > Fix this > > > by implementing the get_fwnode_pad operation for the IFP, which correctly > > > matches the endpoint to the corresponding IFP pad. > > > > > > Signed-off-by: Svyatoslav Ryhel > > > --- > > > drivers/media/i2c/mt9m114.c | 44 ++++++++++++++++++++++++++++--------- > > > 1 file changed, 34 insertions(+), 10 deletions(-) > > > > > > diff --git a/drivers/media/i2c/mt9m114.c b/drivers/media/i2c/mt9m114.c > > > index e395e2d14e97..16c2582551d3 100644 > > > --- a/drivers/media/i2c/mt9m114.c > > > +++ b/drivers/media/i2c/mt9m114.c > > > @@ -1020,14 +1020,6 @@ static int mt9m114_stop_streaming(struct mt9m114 *sensor) > > > return ret; > > > } > > > > > > -/* ----------------------------------------------------------------------------- > > > - * Common Subdev Operations > > > - */ > > > - > > > -static const struct media_entity_operations mt9m114_entity_ops = { > > > - .link_validate = v4l2_subdev_link_validate, > > > -}; > > > - > > > /* ----------------------------------------------------------------------------- > > > * Pixel Array Control Operations > > > */ > > > @@ -1381,6 +1373,10 @@ static const struct v4l2_subdev_internal_ops mt9m114_pa_internal_ops = { > > > .init_state = mt9m114_pa_init_state, > > > }; > > > > > > +static const struct media_entity_operations mt9m114_pa_entity_ops = { > > > + .link_validate = v4l2_subdev_link_validate, > > > +}; > > > + > > > static int mt9m114_pa_init(struct mt9m114 *sensor) > > > { > > > struct v4l2_ctrl_handler *hdl = &sensor->pa.hdl; > > > @@ -1403,7 +1399,7 @@ static int mt9m114_pa_init(struct mt9m114 *sensor) > > > > > > /* Initialize the media entity. */ > > > sd->entity.function = MEDIA_ENT_F_CAM_SENSOR; > > > - sd->entity.ops = &mt9m114_entity_ops; > > > + sd->entity.ops = &mt9m114_pa_entity_ops; > > > pads[0].flags = MEDIA_PAD_FL_SOURCE; > > > ret = media_entity_pads_init(&sd->entity, 1, pads); > > > if (ret < 0) > > > @@ -2092,6 +2088,29 @@ static int mt9m114_ifp_registered(struct v4l2_subdev *sd) > > > return 0; > > > } > > > > > > +/* > > > + * The IFP has only one fwnode endpoint, which corresponds to the pad > > > + * linked to the PA (PA SINK), while it should be the SOURCE for the > > > + * next media device in the pipe. > > > + */ > > > +static int mt9m114_ifp_get_fwnode_pad(struct media_entity *entity, > > > + struct fwnode_endpoint *endpoint) > > > +{ > > > + struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity); > > > + struct mt9m114 *sensor = ifp_to_mt9m114(sd); > > > + struct fwnode_handle *ifp_port = dev_fwnode(&sensor->client->dev); > > > > This is not a port fwnode. I'd name the variable just fwnode. > > > > fair > > > > + struct fwnode_handle *ifp_ep; > > > + int ret; > > > + > > > + ifp_ep = fwnode_graph_get_next_endpoint(ifp_port, NULL); > > > + > > > + ret = endpoint->local_fwnode == ifp_ep ? 1 : -ENXIO; > > > + > > > + fwnode_handle_put(ifp_ep); > > > + > > > + return ret; > > > > Let's use the cleanup API: > > > > #include > > > > ... > > > > struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity); > > struct mt9m114 *sensor = ifp_to_mt9m114(sd); > > struct fwnode_handle *fwnode = dev_fwnode(&sensor->client->dev); > > struct fwnode_handle *ifp_ep __free(fwnode_handle) = > > fwnode_graph_get_next_endpoint(fwnode, NULL); > > > > return endpoint->local_fwnode == ifp_ep ? 1 : -ENXIO; > > > > The code is functionally same. I am fine with any version subsystem > maintainer will prefer. > > > > +} > > > + > > > static const struct v4l2_subdev_video_ops mt9m114_ifp_video_ops = { > > > .s_stream = mt9m114_ifp_s_stream, > > > }; > > > @@ -2119,6 +2138,11 @@ static const struct v4l2_subdev_internal_ops mt9m114_ifp_internal_ops = { > > > .unregistered = mt9m114_ifp_unregistered, > > > }; > > > > > > +static const struct media_entity_operations mt9m114_ifp_entity_ops = { > > > + .link_validate = v4l2_subdev_link_validate, > > > + .get_fwnode_pad = mt9m114_ifp_get_fwnode_pad, > > > +}; > > > + > > > static int mt9m114_ifp_init(struct mt9m114 *sensor) > > > { > > > struct v4l2_subdev *sd = &sensor->ifp.sd; > > > @@ -2136,7 +2160,7 @@ static int mt9m114_ifp_init(struct mt9m114 *sensor) > > > > > > /* Initialize the media entity. */ > > > sd->entity.function = MEDIA_ENT_F_PROC_VIDEO_ISP; > > > - sd->entity.ops = &mt9m114_entity_ops; > > > + sd->entity.ops = &mt9m114_ifp_entity_ops; > > > pads[0].flags = MEDIA_PAD_FL_SINK; > > > pads[1].flags = MEDIA_PAD_FL_SOURCE; > > > ret = media_entity_pads_init(&sd->entity, 2, pads); -- Regards, Laurent Pinchart