From patchwork Thu Apr 4 10:50:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 786650 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 ED6D7763EE; Thu, 4 Apr 2024 10:50:21 +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=1712227823; cv=none; b=R/Kto6UkNegD+jxzLnZhpORoq4YoQ4dx9ppEWIQFvNYvcvJWuTw0fli+XntboWDyqoMTysZdZjKJJvbQvEobGIEdWlKm6fBvaocP8CVACYhxGVYcwRAN7QYaKFweLDxBHuzjx0F7ecN81f6hyssiamIy7C8Hke4sfM/dF+pBCzk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712227823; c=relaxed/simple; bh=7+2nXWnaOTSsKOVrfNaX7gAxdvGAJKcw65XNN4PJTwE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=LfO+GYIJi9VCbB9WvBKhnDt8E9aHxXNKH0hQ4qLFfTI6Kwy4ko4zuMY+Od5wZgClXD53RYa5X9WP4/LQ1hSEyOrNKzoxR8G/TuEvSdEdydTAfrvwNXD4UcP1dJXYwCX07FqkfYW0J13aC1D4iyUEBr86m4e+lBL4TX2mTEBzhis= 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=OLh9z78u; 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="OLh9z78u" Received: from [127.0.1.1] (91-154-34-181.elisa-laajakaista.fi [91.154.34.181]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id E98F0497; Thu, 4 Apr 2024 12:49:41 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1712227782; bh=7+2nXWnaOTSsKOVrfNaX7gAxdvGAJKcw65XNN4PJTwE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=OLh9z78uq4/6oxcxx8HUKvN1cVGnWoTJd+O7pSlZyHtGgRsXXjptHt94pT1wMO9O2 IrE2lc2rp90y6SxkK26LFN5T48by6xG6QF99FFQwpu/LTo5xEaLBQVUhYYZNdK58Kn UOg46PcSPjWsqct/APPTy85f4n+sMBeHZ+taZ/Ds= From: Tomi Valkeinen Date: Thu, 04 Apr 2024 13:50:00 +0300 Subject: [PATCH 1/4] media: subdev: Add checks for subdev features Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240404-enable-streams-impro-v1-1-1017a35bbe07@ideasonboard.com> References: <20240404-enable-streams-impro-v1-0-1017a35bbe07@ideasonboard.com> In-Reply-To: <20240404-enable-streams-impro-v1-0-1017a35bbe07@ideasonboard.com> To: Mauro Carvalho Chehab , Hans Verkuil , Laurent Pinchart , Sakari Ailus , Umang Jain Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Tomi Valkeinen X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2166; i=tomi.valkeinen@ideasonboard.com; h=from:subject:message-id; bh=7+2nXWnaOTSsKOVrfNaX7gAxdvGAJKcw65XNN4PJTwE=; b=owEBbQKS/ZANAwAIAfo9qoy8lh71AcsmYgBmDoXp9Ioox00px095fK3OkdCk2nenPvIPOBdo9 yS5VNab3nKJAjMEAAEIAB0WIQTEOAw+ll79gQef86f6PaqMvJYe9QUCZg6F6QAKCRD6PaqMvJYe 9dIrD/4ihVQivaoXNrP5+biyesLF18AwDelyQtwSl9Bv28mUwz2yiTbVSbKqe99MJcH1rGqDdMa sqTQflMpXgTffa0J5oaXnYN6Dz6dsu4Hz0xpjRtD5NlGemmVUfC5DbhrX1hMlZR97j8k0zAX/67 xzg+I+5HcvpN9tLG30hoSRawtF5nwWTKWFg/ktP6E78eqYcObuC+FBTJ9mzZp+I+1DAgnSlD8M7 52hFg+CzzJSCVOYw67dzk8fKMFfIBXyBZzxnnJvV64kXtK9w6S1vrHOaJSR1V3hW04Qc3dD3KjA ECJtGGYLLwTPCChhynw6SKMwgkkGvinzEjwE0e7sER8RzhYsaeqW/v6DGBS4Z7UFrYQ0pe099/p s5NJV71C24y4vbvWo6k6ZoUTvPM8RcW/y/xxu+p3jSWVBTCU9YQvUrkbh/KNxTyZn5yeEsUqxzO Y96DXVZHWJBwEJ/FGWieGnB4bub4l7aecID4m6+eWfntPPBKfwDwwM3BGxiSZuJGRAHRwoT8+Fr xE5Y2COyl8ILnKxdZqoBFNOEo5T6o2dJ+uLx9K2LJx3bvEjWnnw+o6NYILwC7M5q/8DC90XoSCz DI1Ik++/ZPEz5dzOZbkUuSJVDslzvbEfbjGVci385wj1wWvtfjckaWIxPi9gBrFZJWkzS2exDyJ WrcZ8ZyfGB+/S/A== X-Developer-Key: i=tomi.valkeinen@ideasonboard.com; a=openpgp; fpr=C4380C3E965EFD81079FF3A7FA3DAA8CBC961EF5 Add some checks to verify that the subdev driver implements required features. A subdevice that supports streams (V4L2_SUBDEV_FL_STREAMS) must do one of the following: - Implement neither .enable/disable_streams() nor .s_stream(), if the subdev is part of a video driver that uses an internal method to enable the subdev. - Implement only .enable/disable_streams(), if support for legacy sink-side subdevices is not needed. - Implement .enable/disable_streams() and .s_stream(), if support for legacy sink-side subdevices is needed. At the moment the framework doesn't check this requirement. Add the check. Signed-off-by: Tomi Valkeinen --- drivers/media/v4l2-core/v4l2-subdev.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index 4c6198c48dd6..b90b5185e87f 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -1519,6 +1519,33 @@ int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name, struct lock_class_key *key) { struct v4l2_subdev_state *state; + struct device *dev = sd->dev; + bool has_disable_streams; + bool has_enable_streams; + bool has_s_stream; + + /* Check that the subdevice implements the required features */ + + has_s_stream = sd->ops && sd->ops->video && sd->ops->video->s_stream; + has_enable_streams = sd->ops && sd->ops->pad && sd->ops->pad->enable_streams; + has_disable_streams = sd->ops && sd->ops->pad && sd->ops->pad->disable_streams; + + if (has_enable_streams != has_disable_streams) { + dev_err(dev, + "subdev '%s' must implement both or neither of .enable_streams() and .disable_streams()\n", + sd->name); + return -EINVAL; + } + + if (sd->flags & V4L2_SUBDEV_FL_STREAMS) { + if (has_s_stream && !has_enable_streams) { + dev_err(dev, + "subdev '%s' must implement .enable/disable_streams()\n", + sd->name); + + return -EINVAL; + } + } state = __v4l2_subdev_state_alloc(sd, name, key); if (IS_ERR(state))