From patchwork Thu Aug 22 15:35:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 20996 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id DA1EEC323E for ; Thu, 22 Aug 2024 15:35:50 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 2E32463417; Thu, 22 Aug 2024 17:35:50 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=pass (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="Xdu4AsXQ"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id BE727633E4 for ; Thu, 22 Aug 2024 17:35:40 +0200 (CEST) Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 249F516CD; Thu, 22 Aug 2024 17:34:37 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1724340877; bh=DkRVYKPomm0xFTm0bbXZFEt4UkD+SR8c0EiOkFYeAxo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Xdu4AsXQiLtxZCYKB/M+Pm5YQkWaj3ZIrWmm8JtnFE0czPx+8hLq5+kT/SuvrY+aL b03hpaRSPxIunZ5c4/Kry04xRXPuEbU0B7mjpA6s97JgTf1B5su4gKLD2LaTY689E6 r59upnPyirZrS/usL6Z8LtVqvvI5Q3f7YGxouH48= From: Laurent Pinchart To: libcamera-devel@lists.libcamera.org Cc: Chen-Yu Tsai , Eugen Hristev , Hans Verkuil , Jacopo Mondi , Kieran Bingham , Maxime Ripard , Sakari Ailus , Tomi Valkeinen , linux-renesas-soc@vger.kernel.org, linux-sunxi@lists.linux.dev Subject: [PATCH v2 7/7] [DNI] media: renesas: vsp1: Validate all links through .link_validate() Date: Thu, 22 Aug 2024 18:35:27 +0300 Message-ID: <20240822153527.25320-8-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.44.2 In-Reply-To: <20240822153527.25320-1-laurent.pinchart+renesas@ideasonboard.com> References: <20240822153527.25320-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" 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; + } + + 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; + } + return 0; }