From patchwork Wed Jul 13 21:11:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xavier Roumegue (OSS)" X-Patchwork-Id: 84836 X-Patchwork-Delegate: hverkuil@xs4all.nl Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1oBjeO-009YZb-Cz; Wed, 13 Jul 2022 21:12:04 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237344AbiGMVL6 (ORCPT + 1 other); Wed, 13 Jul 2022 17:11:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237335AbiGMVL5 (ORCPT ); Wed, 13 Jul 2022 17:11:57 -0400 Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2060.outbound.protection.outlook.com [40.107.22.60]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AFC6033374; Wed, 13 Jul 2022 14:11:56 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=LIz21XCdbHeBSHnQEIqJFt53ba+xO1bXmFVSro9auwPMRmS1KVdkp25mY/Rq0bI1E5JuoxPBBdM6273qKkoQZrWyQAgJ8coM9YtcFsR2ZxhdK7m0ooalq5xaTV6CeLo8+4rAPa2QMwfNMR/y2IReymSxgjKAIxBPw8mUSoOGmC7/P9Xm5YtfW3p+BSosm9EROJxiqL0RB0CPJdtx17DmHHDbINHx1CAGr0287ZGuwBE+S8Zu5mtxy6KaCrWInDS96UTIp1pdtOINRDeVXiE2Et7uSsArPYOVjVuKJN4TZt+QMVXL5c9oDR8easYIgSz0PKYXv6FjUXD8AJlSabDnzQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=Qo/HmeunH1NHG1XXb0xWwHqLuUBAYsnJzAwWvlhyq0U=; b=mTn3bVsUOMw5D7X4Em5586TY1os8ORmgjhNmW6Fc1Uix4Cmh7aluaqBZKtLh02LXGsAWYtDECHQ+SHsOW4hinPDqAj0sYYoovbnqkhGr77klzK2phK/u+bHe2cVgjt1HY/V9q5Q3gd1iUtkpxaepSLCzqU+KuCO3DeKp3XXj28fGqasUkixB8Fh3BFx13c+Cc1aN8N5T6VDpS3mzb/hD7l4lpLg/8fQMGNbjv7sq3subOPC23QftE0w+ZtagNve7Vlwu4I8zY3NUVuatwsFVCFX2lMvp2Ff+mDqtvPjSBUYjbP0alRSg26As5HSf73LJuIocNnGeTPPgSxBwloIPbg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oss.nxp.com; dmarc=pass action=none header.from=oss.nxp.com; dkim=pass header.d=oss.nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=NXP1.onmicrosoft.com; s=selector2-NXP1-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Qo/HmeunH1NHG1XXb0xWwHqLuUBAYsnJzAwWvlhyq0U=; b=Ic+IixFlYmLHS7sL1l8G95XcKId5wT4Q0vyHEdtgENZ7GQke0UDJsCAPMSi1BS8MWjGBGq/1rr3+AwEiyDX4JIjdXWJzu/4MsCuU9jo4yQFi4gphOB3yW9/gjOnCzvQ0rXT7IfrFygmnJqJiBatImTcZXKnHtdrnujeCDUTywk4= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=oss.nxp.com; Received: from PAXPR04MB8703.eurprd04.prod.outlook.com (2603:10a6:102:21e::22) by AM9PR04MB8874.eurprd04.prod.outlook.com (2603:10a6:20b:409::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5417.26; Wed, 13 Jul 2022 21:11:54 +0000 Received: from PAXPR04MB8703.eurprd04.prod.outlook.com ([fe80::d51c:319c:bf4:199f]) by PAXPR04MB8703.eurprd04.prod.outlook.com ([fe80::d51c:319c:bf4:199f%5]) with mapi id 15.20.5438.012; Wed, 13 Jul 2022 21:11:54 +0000 From: Xavier Roumegue To: mchehab@kernel.org, hverkuil-cisco@xs4all.nl, stanimir.varbanov@linaro.org, laurent.pinchart@ideasonboard.com, tomi.valkeinen@ideasonboard.com, robh+dt@kernel.org, nicolas@ndufresne.ca, alexander.stein@ew.tq-group.com, ezequiel@vanguardiasur.com.ar Cc: Xavier Roumegue , linux-media@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v7 1/6] media: Documentation: dw100: Add user documentation for the DW100 driver Date: Wed, 13 Jul 2022 23:11:19 +0200 Message-Id: <20220713211124.2677275-2-xavier.roumegue@oss.nxp.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220713211124.2677275-1-xavier.roumegue@oss.nxp.com> References: <20220713211124.2677275-1-xavier.roumegue@oss.nxp.com> X-ClientProxiedBy: PR0P264CA0167.FRAP264.PROD.OUTLOOK.COM (2603:10a6:100:1b::35) To PAXPR04MB8703.eurprd04.prod.outlook.com (2603:10a6:102:21e::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: fdf31417-4d31-4a99-044d-08da65145029 X-MS-TrafficTypeDiagnostic: AM9PR04MB8874:EE_ X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PAXPR04MB8703.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(4636009)(346002)(376002)(366004)(136003)(396003)(39860400002)(41300700001)(8936002)(44832011)(7416002)(186003)(83380400001)(5660300002)(2906002)(6486002)(6666004)(966005)(38100700002)(4326008)(478600001)(316002)(52116002)(66556008)(66476007)(8676002)(6506007)(66946007)(2616005)(6512007)(86362001)(1076003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: fdf31417-4d31-4a99-044d-08da65145029 X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB8703.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Jul 2022 21:11:54.6382 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: EuhU2Q7cMmSVLGFWRr0W0sTfnBoXHFI1L+4x/CUdQ9m292W1CZZCavTzkg5vghAUiCIQ8bUG74nsfCyaLlglbw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR04MB8874 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.4 (--) X-LSpam-Report: No, score=-2.4 required=5.0 tests=BAYES_00=-1.9,DKIMWL_WL_MED=0.001,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no Add user documentation for the DW100 driver. while at it, replace spaces with tab on drivers list. Signed-off-by: Xavier Roumegue Reviewed-by: Laurent Pinchart --- .../userspace-api/media/drivers/dw100.rst | 69 +++++++++++++++++++ .../userspace-api/media/drivers/index.rst | 3 +- 2 files changed, 71 insertions(+), 1 deletion(-) create mode 100644 Documentation/userspace-api/media/drivers/dw100.rst diff --git a/Documentation/userspace-api/media/drivers/dw100.rst b/Documentation/userspace-api/media/drivers/dw100.rst new file mode 100644 index 000000000000..1ca6fa55f539 --- /dev/null +++ b/Documentation/userspace-api/media/drivers/dw100.rst @@ -0,0 +1,69 @@ +.. SPDX-License-Identifier: GPL-2.0 + +DW100 dewarp driver +=================== + +The Vivante DW100 Dewarp Processor IP core found on i.MX8MP SoC applies a +programmable geometrical transformation on the input image to correct distortion +introduced by lenses. + +The transformation function is exposed by the hardware as a grid map with 16x16 +pixel macroblocks indexed using X, Y vertex coordinates. +:: + + Image width + <---------------------------------------> + + ^ .-------.-------.-------.-------.-------. + | | 16x16 | | | | | + I | | pixel | | | | | + m | | block | | | | | + a | .-------.-------.-------.-------.-------. + g | | | | | | | + e | | | | | | | + | | | | | | | + h | .-------.-------.-------.-------.-------. + e | | | | | | | + i | | | | | | | + g | | | | | | | + h | .-------.-------.-------.-------.-------. + t | | | | | | | + | | | | | | | + | | | | | | | + v '-------'-------'-------'-------'-------' + + Grid of Image Blocks for Dewarping Map + + +Each x, y coordinate register uses 16 bits to record the coordinate address in +an unsigned 12.4 fixed point format (UQ12.4). +:: + + .----------------------.--------..----------------------.--------. + | 31~20 | 19~16 || 15~4 | 3~0 | + | (integer) | (frac) || (integer) | (frac) | + '----------------------'--------''----------------------'--------' + <-------------------------------><-------------------------------> + Y coordinate X coordinate + + Remap Register Layout + +The dewarping map is set from applications using the +V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP control. The control contains +an array of u32 values storing (x, y) destination coordinates for each +vertex of the grid. The x coordinate is stored in the 16 LSBs and the y +coordinate in the 16 MSBs. + +The number of elements in the array must match the image size: + +.. code-block:: C + + elems = (DIV_ROUND_UP(width, 16) + 1) * (DIV_ROUND_UP(height, 16) + 1); + +If the control has not been set by the application, the driver uses an identity +map. + +More details on the DW100 hardware operations can be found in +*chapter 13.15 DeWarp* of IMX8MP_ reference manual. + +.. _IMX8MP: https://www.nxp.com/webapp/Download?colCode=IMX8MPRM diff --git a/Documentation/userspace-api/media/drivers/index.rst b/Documentation/userspace-api/media/drivers/index.rst index 12e3c512d718..0c720ca1a27d 100644 --- a/Documentation/userspace-api/media/drivers/index.rst +++ b/Documentation/userspace-api/media/drivers/index.rst @@ -33,7 +33,8 @@ For more details see the file COPYING in the source distribution of Linux. ccs cx2341x-uapi - hantro + dw100 + hantro imx-uapi max2175 meye-uapi