From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.20]) (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 A24EA2DBF5C for ; Mon, 25 Aug 2025 09:51:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.20 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756115509; cv=none; b=H7Vn1MDwnJpj69skN6uzQDjmaGWPa/lJANnqDddhGTz11SM2Gh5kVD4gAp/FozijNjHpSsE4I6MvekWkK4uUTeQCQwVpT6hbHb54W95ucUaq8/+EuL8D9E56+Bqk3PJX91X9WdVtoMMqOGWmv3XQ++DTsN0GQws2ASk4rTC02Y0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756115509; c=relaxed/simple; bh=ll1ntIYYQb8o0yIdfVhCSNLzjzY/CAqIfG+Y6a6ikU0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sqb9sU4vMHc/sP1XiN+2jX9RYC2fmsba2yGKyTrYp27sDMHJ5rAN3B1SlS1IZODHxlolYRxypWTtxkA1HR18jOCiWD7NFpx7j2mHStKVoYLBIF1dlBxXUsaDTYUY/tC2GRWmdQoJr1mM+Py22rdDzHIvEMGZU6QFFq5jHx6q9YE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=d07bO/It; arc=none smtp.client-ip=198.175.65.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="d07bO/It" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1756115508; x=1787651508; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ll1ntIYYQb8o0yIdfVhCSNLzjzY/CAqIfG+Y6a6ikU0=; b=d07bO/ItC52XVT/1Y+8WyP7DxKE9HPmEGUSHl2gMVPlXcuB1AfKnkb9v DA74DPeVrql5cJnvajDEDkGYMJeht/UD9tXhnIYvamEAGRMwh0Dhja9VV 6B5UtZEf4RCgydV+2odhqxl22kfC8SKQie/9V2AC8ATx5KCmWl1TDLxys gHWjAyz61q4PN1LvFq7ZFHntMkuLKjbjc/LWJNSoM8DwIO7Qnb7oOwuYa OB/EmKIuYF3+lKYkywVq9kyqd90/EIxr2b6vlfZGqTO1xOzP0sfW4S8te 5U7iNgy5Snq1UiR0UwA/dt+oBcXuivyIFI8kJykJejYmKr8jKvXsU6/Ro A==; X-CSE-ConnectionGUID: jIoNjP7yRDytgjbhlbsI2w== X-CSE-MsgGUID: ts13x6q+TDSUXXh1kvQNnQ== X-IronPort-AV: E=McAfee;i="6800,10657,11532"; a="58032187" X-IronPort-AV: E=Sophos;i="6.17,312,1747724400"; d="scan'208";a="58032187" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2025 02:51:45 -0700 X-CSE-ConnectionGUID: 0A4vhtRySMe9fEuiIcTNXA== X-CSE-MsgGUID: ZppFCuxKSJK0ttATcXt99A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,312,1747724400"; d="scan'208";a="173431067" Received: from vpanait-mobl.ger.corp.intel.com (HELO kekkonen.fi.intel.com) ([10.245.245.7]) by ORVIESA003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2025 02:51:38 -0700 Received: from punajuuri.localdomain (unknown [192.168.240.130]) by kekkonen.fi.intel.com (Postfix) with ESMTP id A7EB7121FF1; Mon, 25 Aug 2025 12:51:08 +0300 (EEST) Received: from sailus by punajuuri.localdomain with local (Exim 4.98.2) (envelope-from ) id 1uqTr2-00000005agQ-2jBf; Mon, 25 Aug 2025 12:51:08 +0300 Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo From: Sakari Ailus To: linux-media@vger.kernel.org Cc: hans@jjverkuil.nl, laurent.pinchart@ideasonboard.com, Prabhakar , Kate Hsuan , Alexander Shiyan , Dave Stevenson , Tommaso Merciai , Umang Jain , Benjamin Mugnier , Sylvain Petinot , Christophe JAILLET , Julien Massot , Naushir Patuck , "Yan, Dongcheng" , "Cao, Bingbu" , "Qiu, Tian Shu" , "Wang, Hongju" , Stefan Klug , Mirela Rabulea , =?UTF-8?q?Andr=C3=A9=20Apitzsch?= , Heimir Thor Sverrisson , Kieran Bingham , Stanislaw Gruszka , Mehdi Djait , Ricardo Ribalda Delgado , Hans de Goede , Jacopo Mondi , Tomi Valkeinen Subject: [PATCH v11 40/66] media: Document enable_streams and disable_streams behaviour Date: Mon, 25 Aug 2025 12:50:41 +0300 Message-ID: <20250825095107.1332313-41-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250825095107.1332313-1-sakari.ailus@linux.intel.com> References: <20250825095107.1332313-1-sakari.ailus@linux.intel.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Document that enable_streams may start additional streams and disable_streams may not disable requested streams if other related streams are still enabled. Signed-off-by: Sakari Ailus --- include/media/v4l2-subdev.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index 4b28086808c9..96a9c869ffb1 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -814,6 +814,10 @@ struct v4l2_subdev_state { * V4L2_SUBDEV_CAP_STREAMS sub-device capability flag can ignore the mask * argument. * + * Starting the requested streams may require starting additional + * streams. Streams that are started together due to hardware are called a + * stream group. + * * @disable_streams: Disable the streams defined in streams_mask on the given * source pad. Subdevs that implement this operation must use the active * state management provided by the subdev core (enabled through a call to @@ -823,6 +827,9 @@ struct v4l2_subdev_state { * Drivers that support only a single stream without setting the * V4L2_SUBDEV_CAP_STREAMS sub-device capability flag can ignore the mask * argument. + * + * A stream is only disabled once all streams in the stream group are + * disabled. */ struct v4l2_subdev_pad_ops { int (*enum_mbus_code)(struct v4l2_subdev *sd, -- 2.47.2