From patchwork Thu Apr 25 21:27:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 13643775 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) (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 5D9D7155753 for ; Thu, 25 Apr 2024 21:27:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.14 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714080456; cv=none; b=HNmTug//oTPO5g6ArTQyK0GaVnGWHK8pFXQGBDhjXZca5zsysB1CywFX+sQxc8RJ8YGGHmM5eoZMKyLoIr7uuIgwGFC3aN5n/unkdas35z/nQJcqpVQutr61PCcnbZgO/RuW9RXhZC/Cx7XgrPUp/KWUIZE8z2rOmLTiS5l43JU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714080456; c=relaxed/simple; bh=9NVcs+CPjK/NLXHVLxYJeBlkgHJ6cOnfdXWiFvZE//s=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Kgh73YK/KEGISIg73gq34L8RGz6Jy1zFMheHiQ1J4krAiTF0X33DZNeNaYJU3b6J2YHxoFm8tu3CbGxaJd3zLrjcPz09aXPbDMN/BTSOEcBvxrfkywmyRoXovqiBW7BoGTejgagcyDncoQ7X/n/a/znzGjXZdHN63As/swSSPR4= 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=BT+NPlWW; arc=none smtp.client-ip=192.198.163.14 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="BT+NPlWW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1714080454; x=1745616454; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=9NVcs+CPjK/NLXHVLxYJeBlkgHJ6cOnfdXWiFvZE//s=; b=BT+NPlWWTOCq/kwrxj9oequalAo5zcToAyT2iRSsQu7ZEbSO2T/49/Lk DSQn30E/IZHj+E4MUCrZF8halAzUKdMdcIuHuIOapuwngm90WJ/MBeNNF c6HdaDGAJxtsRil5Ss/lEqT+aOv6LsGy1jmbM3NNLojCESYeFnxISLC4c U9jMWMv9Supp5A7MKGk9iOhcDESNZ6c/T38qq1PPE+sMNz0lHgsV9hXPQ xc7z/EA7qBDpzz1h9Wi+PRRje+ucWA4GV8yLJMlSzn6tzb/BdjtcJY7re pMzFWetf/nhvP1NWEk9I2BDnlTvkmYVcrdTHIau5vUp0y/x4Hpn4jsCVG Q==; X-CSE-ConnectionGUID: uBq2SwmuSK2v62MG+IT0cg== X-CSE-MsgGUID: y1BzOIGDTk2UokRHZEiQPg== X-IronPort-AV: E=McAfee;i="6600,9927,11055"; a="10016699" X-IronPort-AV: E=Sophos;i="6.07,230,1708416000"; d="scan'208";a="10016699" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Apr 2024 14:27:33 -0700 X-CSE-ConnectionGUID: pllXJY3ESJagYTeP9QWUUg== X-CSE-MsgGUID: sD95ypPZQCKdVPFyh6GBWg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,230,1708416000"; d="scan'208";a="25620928" Received: from turnipsi.fi.intel.com (HELO kekkonen.fi.intel.com) ([10.237.72.44]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Apr 2024 14:27:30 -0700 Received: from svinhufvud.ger.corp.intel.com (localhost [IPv6:::1]) by kekkonen.fi.intel.com (Postfix) with ESMTP id 52EA3120768; Fri, 26 Apr 2024 00:27:26 +0300 (EEST) From: Sakari Ailus To: linux-media@vger.kernel.org Cc: Laurent Pinchart , tomi.valkeinen@ideasonboard.com, bingbu.cao@intel.com, hongju.wang@intel.com, hverkuil@xs4all.nl, Andrey Konovalov , Jacopo Mondi , Dmitry Perchanov , "Ng, Khai Wen" , Alain Volmat Subject: [PATCH v2 08/14] media: Documentation: Additional streams generally don't harm capture Date: Fri, 26 Apr 2024 00:27:05 +0300 Message-Id: <20240425212711.928300-9-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240425212711.928300-1-sakari.ailus@linux.intel.com> References: <20240425212711.928300-1-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 Having extra streams on the source end of the link that cannot be captured by the sink sub-device generally are not an issue, at least not on CSI-2 bus. Still document that there may be hardware-specific limitations. For example on parallel bus this might not work on all cases. Signed-off-by: Sakari Ailus Reviewed-by: Tomi Valkeinen Reviewed-by: Laurent Pinchart --- Documentation/userspace-api/media/v4l/dev-subdev.rst | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/Documentation/userspace-api/media/v4l/dev-subdev.rst b/Documentation/userspace-api/media/v4l/dev-subdev.rst index f375b820ab68..b76e02e54512 100644 --- a/Documentation/userspace-api/media/v4l/dev-subdev.rst +++ b/Documentation/userspace-api/media/v4l/dev-subdev.rst @@ -529,9 +529,9 @@ the its sink pad and allows to route them individually to one of its source pads. Subdevice drivers that support multiplexed streams are compatible with -non-multiplexed subdev drivers, but, of course, require a routing configuration -where the link between those two types of drivers contains only a single -stream. +non-multiplexed subdev drivers. However, if the driver at the sink end of a link +does not support streams, then only stream 0 of source end may be captured. +There may be additional limitations specific to the sink device. Understanding streams ^^^^^^^^^^^^^^^^^^^^^