From patchwork Thu Jun 20 11:07:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 806159 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 8D83D1AB8EB; Thu, 20 Jun 2024 11:08:12 +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=1718881694; cv=none; b=RkrroWUy763wt0yX6Kpgsr05Z0E/LYARdlvxJEA2NBFDkMSRRGMVCHFhwi0pfdU+SdneDRE1UhjE1rodigYebN8QBWjhIdTRCxtNvefhkjGpG9ZK9p4xScfaDVyei1F/P3SYbpTx5HVvjHFxel2SV+Gu6KN3FNa13kkyzX5ShFc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718881694; c=relaxed/simple; bh=hkNlI+sgdGQzSZGPKmgnDdL4kzR0qMFhYbi4GF2MhhA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ev+3h1EtlR5luLM7U/ls7QcNIb1GCEgkxMOzxSMR9CP45oogtWFhh8p7LTVxqsukjYMOHGZbPjs5b1LCfA3RBO1i6iNUZ3py2+8wb3/VGirHRxv7D6Yuv6P2G8BYnyV879UVG7EINTYTIFG7x7M08xUcZESZ9shVIQv1itqvMTw= 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=rNGWKIWV; 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="rNGWKIWV" Received: from [127.0.1.1] (91-158-144-210.elisa-laajakaista.fi [91.158.144.210]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id A382F1440; Thu, 20 Jun 2024 13:07:49 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1718881670; bh=hkNlI+sgdGQzSZGPKmgnDdL4kzR0qMFhYbi4GF2MhhA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=rNGWKIWVj+WZjUGyHSSfIhd/vSJ9Pi6oM0cfDcXLwo9oHnrO+/5d8D5esn+xWeBDJ 7I/EPFUCg96RwOS2N2JkXJAQ+Kg1V3as2dQscVDODR+A6oIqzqCl+8PvTHpqgnCOOM CBtBkXIqWFGRLJa7dePh/2O8HYBOd4rgopiGN0lo= From: Tomi Valkeinen Date: Thu, 20 Jun 2024 14:07:53 +0300 Subject: [PATCH v2 4/4] media: admin-guide: Document the Raspberry Pi CFE (rp1-cfe) Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240620-rp1-cfe-v2-4-b8b48fdba3b3@ideasonboard.com> References: <20240620-rp1-cfe-v2-0-b8b48fdba3b3@ideasonboard.com> In-Reply-To: <20240620-rp1-cfe-v2-0-b8b48fdba3b3@ideasonboard.com> To: Mauro Carvalho Chehab , Raspberry Pi Kernel Maintenance , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Broadcom internal kernel review list , Rob Herring , Krzysztof Kozlowski Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Naushir Patuck , Laurent Pinchart , Sakari Ailus , Jacopo Mondi , Kieran Bingham , Tomi Valkeinen , 20240531080707.34568-1-jacopo.mondi@ideasonboard.com X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=6375; i=tomi.valkeinen@ideasonboard.com; h=from:subject:message-id; bh=hkNlI+sgdGQzSZGPKmgnDdL4kzR0qMFhYbi4GF2MhhA=; b=owEBbQKS/ZANAwAIAfo9qoy8lh71AcsmYgBmdA2SFjXFTwKl1fuxvldNezS4egKmmfjRMPAhZ WJ2iaZzzFWJAjMEAAEIAB0WIQTEOAw+ll79gQef86f6PaqMvJYe9QUCZnQNkgAKCRD6PaqMvJYe 9VnpEACCQe8jSHZ+Ry+Dw4k039nV97aOw/U6Rsq76xf9hANgmtvGgXXmiQDpPn/oGeIt8PySOqf bUMvcm7Id0zQmyLACo3cmgiiyQyRIOKa/5xHHUiGcjjwf9ux4/u/iBgDh53tacO+tobbIldyRuR 7BSMChsvVvQxDErg/MuH4ze2mrea7Z6yWJ3CqzeEfmld3B8NfS6TNlbCGBWQl15Hprg1Nvw1VjK Nc6/h92reR5/A0m/LyNDUU0fjdxIKXzwk+GpgNmolYkPHT3liSYvkBbARwgkvrsq0XG2FFUxT7u xID354KNZrfpEFpM8VH14r1GudiuUuJbdLLVEx9I3PpseMKtCTrchkez4IsOaB65RidCkl7GIek hsIDE5zdSWAubYWBgIBlS3Kzd+pTbvZRoxHTDFpBSZp6wF2uYMmg4nDBq+/RaC+D9+ZApDkl41X dnkEfBU/Blhy3uzNcKilHTl649hI+aRB6MZpyw5IgBLf1PT8qR6Eiix+LABEb4Cb98zhOMGIc7l CxxM3YEbbAiIF+Tdvnt5MDCAH001brcyr51uOsz0FEvQOQFYTuV/SsOaOp6XIeWFSf5iI3PL693 aLDMaQ7197pqbzwHAF62QfYRyZQ2X4EL9w9MpAhlnw2Xp9WJ8h2o3FeCcloSzshKZE6KDkywtEQ tgM7tKaZL9dpotw== X-Developer-Key: i=tomi.valkeinen@ideasonboard.com; a=openpgp; fpr=C4380C3E965EFD81079FF3A7FA3DAA8CBC961EF5 Add documentation for rp1-cfe driver. Signed-off-by: Tomi Valkeinen --- .../admin-guide/media/raspberrypi-rp1-cfe.dot | 27 ++++++++ .../admin-guide/media/raspberrypi-rp1-cfe.rst | 78 ++++++++++++++++++++++ Documentation/admin-guide/media/v4l-drivers.rst | 1 + 3 files changed, 106 insertions(+) diff --git a/Documentation/admin-guide/media/raspberrypi-rp1-cfe.dot b/Documentation/admin-guide/media/raspberrypi-rp1-cfe.dot new file mode 100644 index 000000000000..7717f2291049 --- /dev/null +++ b/Documentation/admin-guide/media/raspberrypi-rp1-cfe.dot @@ -0,0 +1,27 @@ +digraph board { + rankdir=TB + n00000001 [label="{{ 0} | csi2\n/dev/v4l-subdev0 | { 1 | 2 | 3 | 4}}", shape=Mrecord, style=filled, fillcolor=green] + n00000001:port1 -> n00000011 [style=dashed] + n00000001:port1 -> n00000007:port0 + n00000001:port2 -> n00000015 + n00000001:port2 -> n00000007:port0 [style=dashed] + n00000001:port3 -> n00000019 [style=dashed] + n00000001:port3 -> n00000007:port0 [style=dashed] + n00000001:port4 -> n0000001d [style=dashed] + n00000001:port4 -> n00000007:port0 [style=dashed] + n00000007 [label="{{ 0 | 1} | pisp-fe\n/dev/v4l-subdev1 | { 2 | 3 | 4}}", shape=Mrecord, style=filled, fillcolor=green] + n00000007:port2 -> n00000021 + n00000007:port3 -> n00000025 [style=dashed] + n00000007:port4 -> n00000029 + n0000000d [label="{imx219 6-0010\n/dev/v4l-subdev2 | { 0}}", shape=Mrecord, style=filled, fillcolor=green] + n0000000d:port0 -> n00000001:port0 [style=bold] + n00000011 [label="rp1-cfe-csi2-ch0\n/dev/video0", shape=box, style=filled, fillcolor=yellow] + n00000015 [label="rp1-cfe-csi2-ch1\n/dev/video1", shape=box, style=filled, fillcolor=yellow] + n00000019 [label="rp1-cfe-csi2-ch2\n/dev/video2", shape=box, style=filled, fillcolor=yellow] + n0000001d [label="rp1-cfe-csi2-ch3\n/dev/video3", shape=box, style=filled, fillcolor=yellow] + n00000021 [label="rp1-cfe-fe-image0\n/dev/video4", shape=box, style=filled, fillcolor=yellow] + n00000025 [label="rp1-cfe-fe-image1\n/dev/video5", shape=box, style=filled, fillcolor=yellow] + n00000029 [label="rp1-cfe-fe-stats\n/dev/video6", shape=box, style=filled, fillcolor=yellow] + n0000002d [label="rp1-cfe-fe-config\n/dev/video7", shape=box, style=filled, fillcolor=yellow] + n0000002d -> n00000007:port1 +} diff --git a/Documentation/admin-guide/media/raspberrypi-rp1-cfe.rst b/Documentation/admin-guide/media/raspberrypi-rp1-cfe.rst new file mode 100644 index 000000000000..668d978a9875 --- /dev/null +++ b/Documentation/admin-guide/media/raspberrypi-rp1-cfe.rst @@ -0,0 +1,78 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================================ +Raspberry Pi PiSP Camera Front End (rp1-cfe) +============================================ + +The PiSP Camera Front End +========================= + +The PiSP Camera Front End (CFE) is a module which combines a CSI-2 receiver with +a simple ISP, called the Front End (FE). + +The CFE has four DMA engines and can write frames from four separate streams +received from the CSI-2 to the memory. One of those streams can also be routed +directly to the FE, which can do minimal image processing, write two versions +(e.g. non-scaled and downscaled versions) of the received frames to memory and +provide statistics of the received frames. + +The FE registers are documented in the `Raspberry Pi Image Signal Processor +(ISP) Specification document +`_, +and example code for FE can be found in `libpisp +`_. + +The rp1-cfe driver +================== + +The Raspberry Pi PiSP Camera Front End (rp1-cfe) driver is located under +drivers/media/platform/raspberrypi/rp1-cfe. It uses the `V4L2 API` to register +a number of video capture and output devices, the `V4L2 subdev API` to register +subdevices for the CSI-2 received and the FE that connects the video devices in +a single media graph realized using the `Media Controller (MC) API`. + +The media topology registered by the `rp1-cfe` driver, in this particular +example connected to an imx219 sensor, is the following one: + +.. _rp1-cfe-topology: + +.. kernel-figure:: raspberrypi-rp1-cfe.dot + :alt: Diagram of an example media pipeline topology + :align: center + +The media graph contains the following video device nodes: + +- rp1-cfe-csi2-ch0: capture device for the first CSI-2 stream +- rp1-cfe-csi2-ch1: capture device for the second CSI-2 stream +- rp1-cfe-csi2-ch2: capture device for the third CSI-2 stream +- rp1-cfe-csi2-ch3: capture device for the fourth CSI-2 stream +- rp1-cfe-fe-image0: capture device for the first FE output +- rp1-cfe-fe-image1: capture device for the second FE output +- rp1-cfe-fe-stats: capture device for the FE statistics +- rp1-cfe-fe-config: output device for FE configuration + +rp1-cfe-csi2-chX +---------------- + +The rp1-cfe-csi2-chX capture devices are normal V4L2 capture devices which +can be used to capture video frames or metadata received from the CSI-2. + +rp1-cfe-fe-image0, rp1-cfe-fe-image1 +------------------------------------ + +The rp1-cfe-fe-image0 and rp1-cfe-fe-image1 capture devices are used to write +the processed frames to memory. + +rp1-cfe-fe-stats +---------------- + +The format of the FE statistics buffer is defined by +:c:type:`pisp_statistics` C structure and the meaning of each parameter is +described in the `PiSP specification` document. + +rp1-cfe-fe-config +----------------- + +The format of the FE configuration buffer is defined by +:c:type:`pisp_fe_config` C structure and the meaning of each parameter is +described in the `PiSP specification` document. diff --git a/Documentation/admin-guide/media/v4l-drivers.rst b/Documentation/admin-guide/media/v4l-drivers.rst index b6af448b9fe9..61da154e079a 100644 --- a/Documentation/admin-guide/media/v4l-drivers.rst +++ b/Documentation/admin-guide/media/v4l-drivers.rst @@ -26,6 +26,7 @@ Video4Linux (V4L) driver-specific documentation raspberrypi-pisp-be rcar-fdp1 rkisp1 + raspberrypi-rp1-cfe saa7134 si470x si4713