From patchwork Wed Mar 13 07:24:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 780217 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (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 ADB20168CD for ; Wed, 13 Mar 2024 07:25:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710314755; cv=none; b=osVZWBq5j87JA9TBtJtTYQT13YyG7nfhK1UkR8VXkDCBOwl2FTCtMvHOJ/AR4X22JPOcBZv2cGkQFe4jWxTOfIhJalVE5GX4QStACqbU0z72jT3BcZJiTCA5sBmuNfzPNl6r1p3QZlsNYEN9H7HVe86LpZRJMc/cBx08dPWcqEY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710314755; c=relaxed/simple; bh=U0kPXLUFWjINvab94UyZ/EQJc8/lRJANylD3wwexS+o=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=YohXzkOG270tYQpnjBYh/4DkkkwN9thz4SVaJ2SbmfWboK08/mzkNYTeXdxlEKLR3L9iVE6IWGEGO/Nf/mqz2c2+LrKzWFJV7Fuo8SONmNLaJdL5cBpFOc6uMfKun6Zjx6uAoluJ2aE6ItPuOqjGd8/jm19q9pUr8HUVp4aTyaY= 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=GDWdXoIU; arc=none smtp.client-ip=192.198.163.8 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="GDWdXoIU" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1710314753; x=1741850753; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=U0kPXLUFWjINvab94UyZ/EQJc8/lRJANylD3wwexS+o=; b=GDWdXoIU/PQSYaXUiQ/HGpvbDwWkGtoKGDseAuxgYose4O3SLQxXvOJT 2VlSkqJTa1OYM8XMuZxyup1Z5Cwl511iYvbQShBPLnBeuDRO3QNaZcRha isAFV0vygCo8FIaOSljTqQFScfybLqy8stWeHZ9DC7ogxl4envegt74gX fU8crY+28AZgtXkwcip288OSOdHFihrlQ9mMJUYOfDHa1fp2pJ56J2Jkw bBTkYBfkg/Tej9IZWLVhiZ8xKAi95Jwhec64B2QVf7T+FYuNZ0dbjFNYJ w2CHyaZoJerHGrkm4OhO3ofMj3WaaI7RVuz7O2fWxdNucycm78dPO4xeF g==; X-IronPort-AV: E=McAfee;i="6600,9927,11011"; a="22575549" X-IronPort-AV: E=Sophos;i="6.07,119,1708416000"; d="scan'208";a="22575549" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Mar 2024 00:25:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,119,1708416000"; d="scan'208";a="42816358" Received: from turnipsi.fi.intel.com (HELO kekkonen.fi.intel.com) ([10.237.72.44]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Mar 2024 00:25:32 -0700 Received: from svinhufvud.ger.corp.intel.com (localhost [IPv6:::1]) by kekkonen.fi.intel.com (Postfix) with ESMTP id 85C881201C3; Wed, 13 Mar 2024 09:25:28 +0200 (EET) 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 v8 07/38] media: Documentation: Additional streams generally don't harm capture Date: Wed, 13 Mar 2024 09:24:45 +0200 Message-Id: <20240313072516.241106-8-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240313072516.241106-1-sakari.ailus@linux.intel.com> References: <20240313072516.241106-1-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 --- 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..a387e8a15b8d 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 the stream 0 on source end may be +captured. There may be additional hardware specific limitations. Understanding streams ^^^^^^^^^^^^^^^^^^^^^