From patchwork Wed Sep 4 11:19:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 13790659 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 937C3CD3431 for ; Wed, 4 Sep 2024 11:42:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=kncMR9E8VHOybEPf6D6AZqvUKUCYvL+7V7vYdCgIAQ0=; b=bGvExxucnSvTllwDwcvGrlY1/B m3BGWxn2jaHMAaJqrzxXvN8vD+NG36cps4WD2SWa5hejMZ80pFGVyScITI6GS0Vo/41nG6pOvkPc4 gynkkPg/O7rA/sxWIgtQD9YocQO4fCzNNu5sLSUXnDK+pfB3BdwBHXolKXwLynCXk/IDiyZGUWHBM 5um0Ihe7FkcSStWGCUFQQzsppu4r7bvK9nVXbyUFkUEa+3/USs4DmG7T9YH2wj0RScdBCl3/3aIju LZRaIYQX7IwaaBGRYSh68ogDvrPiKEtPLHh+Xqc+7EgDToh9pMuFR/VqCWgrl0DF3dI2awnPmzAnZ Vgtw0PFw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sloOp-00000004CbS-0xRR; Wed, 04 Sep 2024 11:42:11 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1slo33-0000000467s-18kT; Wed, 04 Sep 2024 11:19:44 +0000 Received: from [127.0.1.1] (91-156-87-48.elisa-laajakaista.fi [91.156.87.48]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id DFF741667; Wed, 4 Sep 2024 13:18:26 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1725448707; bh=ldQ0outL4QKLwryuC/LIt5eVxQJHAdWhRM3fm421H80=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=QpCutlmt1xgUwjUGOCQVvDLpiTzz68H4+zRrdi+Q3E0EC4L72NUM/FhxVyu/qQexL Jc1/hkO0/2tmZoa9srWrmnYp9uxtsk9UyIW/Vj7YPKYEzxLhbY7K3mhnVrvk9KKdw0 2Xhukyxq5RBY9cvw/8XQUtNy63zZR2epGu78Nt9E= From: Tomi Valkeinen Date: Wed, 04 Sep 2024 14:19:12 +0300 Subject: [PATCH v4 4/4] media: admin-guide: Document the Raspberry Pi CFE (rp1-cfe) MIME-Version: 1.0 Message-Id: <20240904-rp1-cfe-v4-4-f1b5b3d69c81@ideasonboard.com> References: <20240904-rp1-cfe-v4-0-f1b5b3d69c81@ideasonboard.com> In-Reply-To: <20240904-rp1-cfe-v4-0-f1b5b3d69c81@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 X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=6375; i=tomi.valkeinen@ideasonboard.com; h=from:subject:message-id; bh=ldQ0outL4QKLwryuC/LIt5eVxQJHAdWhRM3fm421H80=; b=owEBbQKS/ZANAwAIAfo9qoy8lh71AcsmYgBm2EJES1LdfUszMvchzvm+GMvfWmS7d4n9Sy5+I pTCILBELBaJAjMEAAEIAB0WIQTEOAw+ll79gQef86f6PaqMvJYe9QUCZthCRAAKCRD6PaqMvJYe 9X3/D/9K21Z2vx7Gl2+IuakDPfT6CClfYMu1w3SioxKx17J7OfpXt1yK1O3ACI4KhhQnpc74mMF 6RM8lvGujL0GJexuAKcO4y5An+XTJ77E5hejnPFy1cTToNkCM3NVuxdhbE30XY2c0QZ1vfzmezB rUxCBBaV49lsSfYy+fZbbtCAq4EU1EkoVIzF1iXf37I94X1MlDvREuYmXoo492I3Rr5DBNHDpKY H3ZJD+vCCib8x1YguyOLPGb+zi51r97SM9GwU71/E+RRFM01OdnNflNZ1RGq7Mjf5ZuWTU9J7jB awotjqKhsy5HJxBPIcJznOw6qPq1Dkvqf9grQ7hNbpzlmwzBrsIPn4kGFVCma6PjxVra/CUg4Gz XuJPLTwZhVQZIEWLzoixoqswcYB3/OFp56Mj3K2ddnzscrsRY+I+vX5hMyO/2w4rxPkv6OomGR5 hrFvfLcHpY0B0cJFo2AvkHTQ/DumlG+L5zj+FZzA1mvfyPpNBJtgDF66Wp8W6WfilRfrzBoyhAm 6GfTlW79VIcg/6rShAyL6yteeeuATPjxUHMjKiPl2oP5LEtir0OsZ26nKO09PCuyTExUcxQKlmJ cEqesBswmfo45a02tgxNEnc+KsBmFPgNPfiKDswvndVZ7TtSw50RYeAIUqsLhAk+2v9R5HBTc8R KCnNJ4h7X6I1fzw== X-Developer-Key: i=tomi.valkeinen@ideasonboard.com; a=openpgp; fpr=C4380C3E965EFD81079FF3A7FA3DAA8CBC961EF5 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240904_041941_562209_4013E2EF X-CRM114-Status: GOOD ( 16.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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