From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from AM0PR02CU008.outbound.protection.outlook.com (mail-westeuropeazon11013026.outbound.protection.outlook.com [52.101.72.26]) (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 A42BC383C75; Thu, 12 Mar 2026 03:10:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.72.26 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773285043; cv=fail; b=Qb2ZkABn3uysnw4ZsH9WhGc3w3md0AOVonL9kjc5Jw3jA9hEqvv2BkH4mZggYL3pAeXOzwJeI2RZ2M1K1GIxaVBTB/UK0WHe+HpvPd8vIIviq8aZJD+G50DpgDmgdxO9cAxwbz3hb+UF/S8UVbjcwC+xmAG57hDdVfe73v3IF1I= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773285043; c=relaxed/simple; bh=r3GG/uEHoENedJ0g5zMwMzONpx7LP/XyIqQSeHxnCRU=; h=From:Subject:Date:Message-Id:Content-Type:To:Cc:MIME-Version; b=hqNk5heiyCaKRKYaSTiI1Nt3BYKg8W0axL1m7Gj7Aplf2f2++gXZ3jCiI4xfuAdm9uisRfPD8H2rLeC4dd5MKq1HkFayz+WXWhLm4EHfDhd0CcIfg04ONyDfx7yOe5lvoAsUunRSf1rBOFA0lAT3tpAvsvBIaehjG/eZtYeRkQA= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=oss.nxp.com; spf=pass smtp.mailfrom=oss.nxp.com; dkim=pass (2048-bit key) header.d=NXP1.onmicrosoft.com header.i=@NXP1.onmicrosoft.com header.b=YJVdqDz6; arc=fail smtp.client-ip=52.101.72.26 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=oss.nxp.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.nxp.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=NXP1.onmicrosoft.com header.i=@NXP1.onmicrosoft.com header.b="YJVdqDz6" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=tNoqMcY1lyHo0vOnjCU9RU/Yd0DqdKPK+/Qe3hK+MQl6WDTU58QGLjyw/ZcJDzaQO/kV2BRa1WrGtmtON6lmNuP8Zu77e7Od5zViFgBOsow6J9wRi+r+unvUWv3OgZ1J2ZFOfcCL9ZZJNA1wditDczWDjN77OfmLODlw7kxuw9/ceT8NtOYt3nbSQUd0vGaFkrKnRAniPNbokrw3ZGQkA+427oA8bJIj8TmFPNNybgbjzjfNQBzwmaG/MHe7ZIsZYtvNC1fxE8j7P9RY4e0qTC5vtWZuhBylHQcgBhMZQHH0ASeNpHgImkPtsu01zrIoXE/dNt9YWhyIx0BgajAPoA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=bZ7NSpD2qJ0pndiK0rJ+ajfAaEvvxvPyVX4xQv6WneA=; b=hjG9q0FSKWed53e8Hg5Jgo894O5X4fKsgu92nR6cV6irIGv0JJIsLcGOBjJnU0Zw07M3mTTrPjqSKibu43/8s+w1f4UD7/L1D4uqXAeQxNCMhmZOYypfSEcFdKCIZCowF6yKquJSUpHWn9WD/hZBY8QiCyQce2srDkQou3qihdCPg3wg7pCmfdER8DOf9EPxX8r8kY54wBnGZL5hiyS6nLyYRUQVUdHoaBVTtayhHvWHCzKcMbvf4F5HvGMxKATxcoE8zkLffA8vUifu1Fh4TzQzLiY+pgorlEpsAOOjvXntGSDn10rjS64XS2/rqClbZg6Yo0kciD8AZyUJKh2jig== 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=selector1-NXP1-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=bZ7NSpD2qJ0pndiK0rJ+ajfAaEvvxvPyVX4xQv6WneA=; b=YJVdqDz62OZpJVtFCWXjQEfPWk8KmoT+YTeEBKKsc2yt2qEpB8v3q2VKfDEgqcRJVOROqYwClLqifZg3xtjHTxEOyY8bSxoEG1kCwugUOCSF2StDBgCZIx08lviBhmHEkc5aAtKPdd4dN5DQgUDnaCDnni5NhcWzKEA6X+rtMsrIvjxvYL8O2o8HD6BTQGy3QrklYne45bbw8mGv4+1wwqBkSxzrde0jn+xnMXo2PO+c8KR3q2q4QzdXTAdd97wRBaeVMFRvq37lB6atE0wlZeyg2WUb+Ndj7yx68BAyqvbQfc00C05Ws8OJkamfL0/Sntxf1er9ofaz5AV32+8EQQ== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=oss.nxp.com; Received: from AS8PR04MB9080.eurprd04.prod.outlook.com (2603:10a6:20b:447::16) by FRZPR04MB12395.eurprd04.prod.outlook.com (2603:10a6:d10:1cc::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9700.15; Thu, 12 Mar 2026 03:10:36 +0000 Received: from AS8PR04MB9080.eurprd04.prod.outlook.com ([fe80::92c2:2e03:bf99:68eb]) by AS8PR04MB9080.eurprd04.prod.outlook.com ([fe80::92c2:2e03:bf99:68eb%4]) with mapi id 15.20.9678.016; Thu, 12 Mar 2026 03:10:36 +0000 From: Guoniu Zhou Subject: [PATCH v2 0/2] media: nxp: imx8-isi: Fix single frame capture and optimize buffer usage Date: Thu, 12 Mar 2026 11:12:33 +0800 Message-Id: <20260312-isi_min_buffers-v2-0-d5ea1c79ad81@nxp.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIACEvsmkC/2WNwQqDMBBEf0X23JRkDaHpqf9RRDSudQ9GSdpgk fx7U6GnHt8w82aHSIEpwrXaIVDiyIsvgKcK3NT5BwkeCgNKNLJWUpRGO7Nv+9c4UohC99rKTqF GrKGs1kAjb4fx3hSeOD6X8D4OkvqmP5f6cyUlpHAWrR0MXToyN7+tZ7fM0OScP1RlI7KsAAAA X-Change-ID: 20260310-isi_min_buffers-4b490a124223 To: Laurent Pinchart , Mauro Carvalho Chehab , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Stefan Riedmueller , Jacopo Mondi , Christian Hemp Cc: linux-media@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexi Birlinger , Dong Aisheng , Guoniu Zhou , stable@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1773285164; l=1300; i=guoniu.zhou@nxp.com; s=20250815; h=from:subject:message-id; bh=r3GG/uEHoENedJ0g5zMwMzONpx7LP/XyIqQSeHxnCRU=; b=FaqIqlUl4RJSMCL7J0GwTwhcjQ9XHeDe94sAVsJpJQgvhu4eec2jzkHIiWLaETvRGiyN4595r 00rfHjanz1mCE4mt5hOL6m7a9T8klftLoSXOVII1FAkBeuzPxFAAIwx X-Developer-Key: i=guoniu.zhou@nxp.com; a=ed25519; pk=MM+/XICg5S78/gs+f9wtGP6yIvkyjTdZwfaxXeu5rlo= X-ClientProxiedBy: MA5P287CA0231.INDP287.PROD.OUTLOOK.COM (2603:1096:a01:1b1::7) To AS8PR04MB9080.eurprd04.prod.outlook.com (2603:10a6:20b:447::16) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR04MB9080:EE_|FRZPR04MB12395:EE_ X-MS-Office365-Filtering-Correlation-Id: 7565a37c-8781-4962-bee5-08de7fe4ee7b X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-LD-Processed: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|19092799006|1800799024|376014|52116014|7416014|38350700014|56012099003|18002099003; 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:AS8PR04MB9080.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(19092799006)(1800799024)(376014)(52116014)(7416014)(38350700014)(56012099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?cFk4RTNZbjdRSDhWdENUU2ZmUDdmY2F6SkRYNHEvMDdSbS90d0E5Y2VqbXE2?= =?utf-8?B?RGROY0NmeE4zOC82OHJaQ002ZndjcVNtaDZmQmNEREk5NWpkQisvWWo1eE1S?= =?utf-8?B?OEtoWkVCdjZuTmZUa25ITENWeXRyZWdZdFRIblQ3OUhWdmJPbHAydUJlYW40?= =?utf-8?B?NUZZZnRwR3VnTFpTUkVxN21NdEFkRENENkVCN0VQdzEyYTlkem5vVDhHYk1S?= =?utf-8?B?Qmw4L0VLcThNZFdvZkFtMDM2dXY3RmoycXJob0F5TWxjK0QrdHhHYlFMNWhp?= =?utf-8?B?bEQ3VUlJQ2hlS1hMZ0ZGSE01dVBsOUFDc05tYksxemRkRTRBZTMrN1UzZzln?= =?utf-8?B?STVHcHpPbzNQeDQ5VzlZRExsckxUOTdqc2FnemJQNGZtWFZpRVBIZXAxQ3pm?= =?utf-8?B?QkVhREczWE5DTDhxYkcrZTl5MVVwQ3pvWWVFVWZUU3RmUVgxWHpjRzhncnVQ?= =?utf-8?B?Q09LQk5pLzdTSG9aTmZ4YzBEZEtQcXJGeUdhL1l4ODNpRlR6cmo1SkNrSUNh?= =?utf-8?B?OHR6UjA1ZVkzT0h6YVFzODdZcC9aTklpODFVeTRRRENSLzdOQnpqa1BKOWxk?= =?utf-8?B?bFZJWVkweWNhQUNKcXYxSmdiUE9XcEVNdHUzeFJ6d0s1OEVTdFpwMFZZNDFU?= =?utf-8?B?ZENvUWFWcnA0R094eE9nTHM5LzVsdkNxanBEb2x3c2NIRGpkZVRaOUxVNE9M?= =?utf-8?B?YWNRQThhWW4zY2xscU9Xc2lvY0xBRnpKZVBEUGRCSjRwOE5rR1ZaTm5WSTIx?= =?utf-8?B?MFFWMXRwZjRmSzFnMHZSMU52b3hVOTBiOTFJOENnVzdEYWpIZjRFWENFOVFP?= =?utf-8?B?SnJ5OXcySXJPY2tkM1RXUHV6K2lVYitCaWFzTGJESmVQbExobGpWNldTZEZk?= =?utf-8?B?NFVuZlJyNFVGRXdvNWxGb1ltTlA4bkxZd0Rta2tJTE01ZlcyWlN2dzhObDd2?= =?utf-8?B?U0UvU3dQTUppYWkxZ2d6NUI1S3IxTGxoZlkycytwc2wwYS9WT3M5MHdrMzNZ?= =?utf-8?B?K0J6NHNpUUpJdzN1cUtUWmtCQVdqTVZDZy9VNWNWa2E2NEgrc1JwZ3Z6MDQv?= =?utf-8?B?WXAyVjZUN01McHFZeVdKSVliR3luZGhPZG1qWndabkxIanJIMkh6Ui9CenpQ?= =?utf-8?B?bjdWTjBFdkFQSTJxY284eDJUeEo4aUJDMDlPdk5zbWVsRFMrQldOME9mTDFL?= =?utf-8?B?aG9tbVFNQk1sMjFKWmpId3FZejN0K05vSnp1VlRBT3pJQkUzODFNOERLZW9r?= =?utf-8?B?ZzdZL21TSEdpSWNlci9pb1dHaW14UDVEOTg2OVpObXFuek5IVERjOVZiUjhi?= =?utf-8?B?NTRGVkFuTTR5RE1hOHFwbkljcDhndkZMdmwvL1JFNVh6NkhTd3BNSWZSZzVw?= =?utf-8?B?R3FDYmEzMzBLWnZNbzlMeDBVK3BCZ3JFSmtWdnZrb3ZNbmRpQ01yd0hDQnRK?= =?utf-8?B?V1owQ0Y0azlMQ25QazlsWm5odHl2aHpnQ3lWbnNPMTdjbXJFL0lXcjdoZUVu?= =?utf-8?B?SGt1QzZLRzhrZzE1S0VOREh0ZEdUU09iL1RRRkxTRjRneWZZWTFyUVJyUlJF?= =?utf-8?B?L2E1OXcxRTdNMTNRNTM0ak5Fcno5cWlEdEhTeFFIZ3AxVGl6VjN0UVNURVpZ?= =?utf-8?B?UnZ1SUhSZVdXNllWcFJLMzlTOWF3cUNrc0RKMDVBVG01Ylk1SFRwNElLU1pH?= =?utf-8?B?L0M2Q2tKY1d5YlhwMHYwUmdqSHBtbEROOU8zUkVpYW5Oa280U1JnV0g5ZDlR?= =?utf-8?B?Y2RkOEhuRVRxTWw3eHFJL2FnTUh0ZXZXdGtZVk5NQ3UrK1dseUR6dXNHMWsv?= =?utf-8?B?L1F4NDl3Wmc5MGp2eFJJdnVQalRla2FHWEVyMTBGWlhIU2J4RmkrTHdtOHpp?= =?utf-8?B?bEZMMzVCQkp0YnowMUJSeS9TTEpPaHJXWmN1NmNSMEVCdWt4c3VCVW9pcU94?= =?utf-8?B?QjRwc0NpdU00SzU0enBpeDdZRlBvU0xVZkJoU01LMHFIS2ZtOXArOEtXVjJo?= =?utf-8?B?M1U0WFREMUd2ckVQd2pNOFg2Q2FscGF5Y05kU0xtSWt2RHZSeWxRMGRKT1Vv?= =?utf-8?B?ZVdzL1E1WmxQdjF5QVI4M1BHcWlFSW4zVUVZdjNXbEdBZ2lNeHd6OGpGZTNH?= =?utf-8?B?TXVhSGthbjBZOXVGcngrYW5UaXBLZkpxMEorZXpKTWF4QXJidmo1ekdnR3lX?= =?utf-8?B?UjhScWRpeGl5S3QyU05EOVpwUmRvOHVsNHFORjN4ZDlDbkNsNkFWeURUbVlL?= =?utf-8?B?YllsT0NsM3J2OEhnc2EvUkgxTFBHMzFkSlE2eE5NTDlVRHg2NVY1Q3dPTXIx?= =?utf-8?B?MUsxb0RaaitONlVub1BTaTJtajQ0bVVvQTdxMUtLUWVUaFBVTUprZz09?= X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7565a37c-8781-4962-bee5-08de7fe4ee7b X-MS-Exchange-CrossTenant-AuthSource: AS8PR04MB9080.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Mar 2026 03:10:36.5312 (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: QlbvO34gYzICHpdbX3qSgSCfUL2jz69dZ8K6HZIMMEjqi7YvHm4TiF3MddguTAu8+an62JpXtuHhWVMSscUPYg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: FRZPR04MB12395 This series fixes a hang issue when capturing single frames and improves buffer utilization by prioritizing user buffers over discard buffers. Patch 1 reduces min_queued_buffers to allow streaming with a single buffer, fixing hangs in applications like libcamera's cam tool. Patch 2 changes the buffer selection logic to use pending user buffers first, minimizing unnecessary frame drops at stream start. Signed-off-by: Guoniu Zhou --- Changes in v2: - Add fix tag - Replace "This ensures" with "ensure" - Reduce min_queued_buffers from 2 to 0 suggested by Jacopo Mondi - Put example from commit message to comment in driver suggested by Frank - Detailed changes can be found in each patch's changelog - Link to v1: https://lore.kernel.org/r/20260311-isi_min_buffers-v1-0-c9299d6e8ae6@nxp.com --- Guoniu Zhou (2): media: nxp: imx8-isi: Reduce minimum queued buffers from 2 to 0 media: nxp: imx8-isi: Prioritize pending buffers over discard buffers drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) --- base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f change-id: 20260310-isi_min_buffers-4b490a124223 Best regards, -- Guoniu Zhou