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 D190C14EC77 for ; Mon, 26 Aug 2024 11:43:52 +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=1724672634; cv=none; b=G8sx7wiS7QDPdmwY3GUIz0tyrmnogJ8wWWm512FlTV73wekzJ0Bl/F02u0tk2lniMrXIx4dyuhR8cj3OGFcwXxRb0OJt3BnAREpgC7W7VU16j7Q15OMz1PZcaBcTAB+GzQAyI7Gg+ZlYjITHoYtHez9JHUiZnUU13IFDk5A7YYE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724672634; c=relaxed/simple; bh=mBNa8dfx3Gjse1tciYkUBjoyaRZDW9PTWTffgcH3j7I=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=PGkl/C6/DNmkMnnkOySM4p0ihUegeDTJpe3craVPz/lpbLVdPfnlPre65SeMO/s0aNX5zKlAvk//0oz/3U0anC6O2JuFPGkP8iRkJaAuixoAzQJCK6q+0hiYUePAab2c/IZZgfJpIer5Na41QclHxIboyAYjjZOcsB/gpMuMqQM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (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=j2s59RRk; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (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="j2s59RRk" Received: from [192.168.88.20] (91-156-87-48.elisa-laajakaista.fi [91.156.87.48]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 7EA89480; Mon, 26 Aug 2024 13:42:44 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1724672565; bh=mBNa8dfx3Gjse1tciYkUBjoyaRZDW9PTWTffgcH3j7I=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=j2s59RRkuG0BsAubIAOF7mQOgsVw5Kv6kWmx4ONKseOG/6pqD7vbgOP1J5XAQm80g 0w7Yolv3CVUb5ygeEKU84gMSg2cjwfpu6aERLSWg+2LP2g9jhKnlQz06KsAvvT0Vdd dg8evTxTSp6JvEblh+yL+FC3sExNtPBBYBv5NSI8= Message-ID: <93fd78a6-c8fa-421f-b10c-69a42ac8112d@ideasonboard.com> Date: Mon, 26 Aug 2024 14:43:47 +0300 Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 7/7] [DNI] media: renesas: vsp1: Validate all links through .link_validate() To: Laurent Pinchart , linux-media@vger.kernel.org Cc: Chen-Yu Tsai , Eugen Hristev , Hans Verkuil , Jacopo Mondi , Kieran Bingham , Maxime Ripard , Sakari Ailus , linux-renesas-soc@vger.kernel.org, linux-sunxi@lists.linux.dev References: <20240822154531.25912-1-laurent.pinchart+renesas@ideasonboard.com> <20240822154531.25912-8-laurent.pinchart+renesas@ideasonboard.com> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, On 22/08/2024 18:45, Laurent Pinchart wrote: > Move validation of the links between video devices and subdevs, > performed manually in vsp1_video_streamon(), to the video device > .link_validate() handler. > > This is how drivers should be implemented, but sadly, doing so for the > vsp1 driver could break userspace, introducing a regression. This patch > serves as an example to showcase usage of the .link_validate() > operation, but should not be merged. > > Signed-off-by: Laurent Pinchart > --- > .../media/platform/renesas/vsp1/vsp1_video.c | 98 +++++++------------ > 1 file changed, 37 insertions(+), 61 deletions(-) > > diff --git a/drivers/media/platform/renesas/vsp1/vsp1_video.c b/drivers/media/platform/renesas/vsp1/vsp1_video.c > index e728f9f5160e..14575698bbe7 100644 > --- a/drivers/media/platform/renesas/vsp1/vsp1_video.c > +++ b/drivers/media/platform/renesas/vsp1/vsp1_video.c > @@ -45,51 +45,6 @@ > * Helper functions > */ > > -static struct v4l2_subdev * > -vsp1_video_remote_subdev(struct media_pad *local, u32 *pad) > -{ > - struct media_pad *remote; > - > - remote = media_pad_remote_pad_first(local); > - if (!remote || !is_media_entity_v4l2_subdev(remote->entity)) > - return NULL; > - > - if (pad) > - *pad = remote->index; > - > - return media_entity_to_v4l2_subdev(remote->entity); > -} > - > -static int vsp1_video_verify_format(struct vsp1_video *video) > -{ > - struct v4l2_subdev_format fmt = { > - .which = V4L2_SUBDEV_FORMAT_ACTIVE, > - }; > - struct v4l2_subdev *subdev; > - int ret; > - > - subdev = vsp1_video_remote_subdev(&video->pad, &fmt.pad); > - if (subdev == NULL) > - return -EINVAL; > - > - ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt); > - if (ret < 0) > - return ret == -ENOIOCTLCMD ? -EINVAL : ret; > - > - if (video->rwpf->fmtinfo->mbus != fmt.format.code || > - video->rwpf->format.height != fmt.format.height || > - video->rwpf->format.width != fmt.format.width) { > - dev_dbg(video->vsp1->dev, > - "Format mismatch: 0x%04x/%ux%u != 0x%04x/%ux%u\n", > - video->rwpf->fmtinfo->mbus, video->rwpf->format.width, > - video->rwpf->format.height, fmt.format.code, > - fmt.format.width, fmt.format.height); > - return -EPIPE; > - } > - > - return 0; > -} > - > static int __vsp1_video_try_format(struct vsp1_video *video, > struct v4l2_pix_format_mplane *pix, > const struct vsp1_format_info **fmtinfo) > @@ -991,14 +946,6 @@ vsp1_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type) > > mutex_unlock(&mdev->graph_mutex); > > - /* > - * Verify that the configured format matches the output of the connected > - * subdev. > - */ > - ret = vsp1_video_verify_format(video); > - if (ret < 0) > - goto err_stop; > - > /* Start the queue. */ > ret = vb2_streamon(&video->queue, type); > if (ret < 0) > @@ -1087,14 +1034,43 @@ static const struct v4l2_file_operations vsp1_video_fops = { > > static int vsp1_video_link_validate(struct media_link *link) > { > - /* > - * Ideally, link validation should be implemented here instead of > - * calling vsp1_video_verify_format() in vsp1_video_streamon() > - * manually. That would however break userspace that start one video > - * device before configures formats on other video devices in the > - * pipeline. This operation is just a no-op to silence the warnings > - * from v4l2_subdev_link_validate(). > - */ > + struct v4l2_subdev_format fmt = { > + .which = V4L2_SUBDEV_FORMAT_ACTIVE, > + }; > + struct v4l2_subdev *subdev; > + struct media_entity *entity; > + struct media_pad *remote; > + struct vsp1_video *video; > + int ret; > + > + if (is_media_entity_v4l2_video_device(link->source->entity)) { > + entity = link->source->entity; > + remote = link->sink; > + } else { > + entity = link->sink->entity; > + remote = link->source; > + } This looks a bit odd. So this device can be either a source and a sink? This made me also wonder about the .link_validate(). It's the only media_entity_operations op that does not get the media_entity as a parameter. Which here means the driver has to go and "guess" whether it is the source or the sink of the given link. I wonder if there's a reason why .link_validate() doesn't have the media_entity parameter? > + > + fmt.pad = remote->index; > + > + subdev = media_entity_to_v4l2_subdev(remote->entity); > + ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt); > + if (ret < 0) > + return ret == -ENOIOCTLCMD ? -EINVAL : ret; > + > + video = to_vsp1_video(media_entity_to_video_device(entity)); > + > + if (video->rwpf->fmtinfo->mbus != fmt.format.code || > + video->rwpf->format.height != fmt.format.height || > + video->rwpf->format.width != fmt.format.width) { > + dev_dbg(video->vsp1->dev, > + "Format mismatch: 0x%04x/%ux%u != 0x%04x/%ux%u\n", > + video->rwpf->fmtinfo->mbus, video->rwpf->format.width, > + video->rwpf->format.height, fmt.format.code, > + fmt.format.width, fmt.format.height); > + return -EPIPE; > + } Why don't we have a common videodev state which could be used to do these validations in a common function? =) Fwiw: Reviewed-by: Tomi Valkeinen Tomi