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2026 09:04:27 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/6] media: v4l2-isp: Add support for extensible statistics To: Antoine Bouyer , Jacopo Mondi , Mauro Carvalho Chehab , Daniel Scally , Jai Luthra , =?UTF-8?Q?Niklas_S=C3=B6derlund?= , Ricardo Ribalda Cc: Laurent Pinchart , Sakari Ailus , Hans Verkuil , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260505-extensible-stats-v1-0-e16f326b8dad@ideasonboard.com> <777ea8b5-b00a-40e0-b649-59324ff0188a@nxp.com> Content-Language: en-US From: Keke Li In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI2PR01CA0054.apcprd01.prod.exchangelabs.com (2603:1096:4:193::22) To TYSPR03MB8627.apcprd03.prod.outlook.com (2603:1096:405:8a::9) Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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=?utf-8?B?YXVRUHZiMHg5blFBc29IYzV0TE5hVVpURUxKSUhqd0ZZN25ieHNTdz09?= X-OriginatorOrg: amlogic.com X-MS-Exchange-CrossTenant-Network-Message-Id: 58a9846b-269a-4a23-adc4-08deb08b96c5 X-MS-Exchange-CrossTenant-AuthSource: TYSPR03MB8627.apcprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 May 2026 01:04:31.3729 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 0df2add9-25ca-4b3a-acb4-c99ddf0b1114 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: fsf8Xu+czh9oFipvgXrDhCsdwA0e7Vp9v2AejHUxkLfE14SyZcdJeo0n5N/EF/D4uhfXyRpcZgjJW2V1iByHkg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYZPR03MB7132 On 5/12/26 17:26, Antoine Bouyer wrote: > [ EXTERNAL EMAIL ] > > Le 05/05/2026 à 18:49, Antoine Bouyer a écrit : >> On 5/5/26 4:12 PM, Jacopo Mondi wrote: >>> >>> >>> This series breaks out from Antonie's >>> https://eur01.safelinks.protection.outlook.com/? >>> url=https%3A%2F%2Fpatchwork.linuxtv.org%2Fproject%2Flinux- >>> media%2Flist%2F%3Fseries%3D24043&data=05%7C02%7Cantoine.bouyer%40nxp.com%7Cd0e9f403856c4146996308deaab05cd1%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C639135871605732002%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=FXaz7QYQvS3s%2B4l9AFMrGgE7kmXlEil%2FKD6DibB0%2FJY%3D&reserved=0 >>> >>> the extensible stats support and adds a few more patches on top to: >>> >>> - add support for per-block validation as suggested during the >>> review of >>>    Ricardo's >>>    https://eur01.safelinks.protection.outlook.com/? >>> url=https%3A%2F%2Fpatchwork.linuxtv.org%2Fproject%2Flinux- >>> media%2Fpatch%2F20260504-smatch-7-1-v3-6- >>> fda125c30058%40chromium.org%2F&data=05%7C02%7Cantoine.bouyer%40nxp.com%7Cd0e9f403856c4146996308deaab05cd1%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C639135871605751612%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=AiRH8MhIbXt3dr%2B2r3I6STE6TJAChylnH%2Fz3tLdS36k%3D&reserved=0 >>> >>> >>> - add two helper functions to v4l2-isp to ease handling of extensible >>>    statistics for drivers. An early user, based on a preliminary >>> version >>>    of the patches is available here as a reference: >>>    https://eur01.safelinks.protection.outlook.com/? >>> url=https%3A%2F%2Fpatchwork.linuxtv.org%2Fproject%2Flinux- >>> media%2Flist%2F%3Fseries%3D24703&data=05%7C02%7Cantoine.bouyer%40nxp.com%7Cd0e9f403856c4146996308deaab05cd1%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C639135871605763086%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2Fpsb7Z3lb8ingDILxc3LoEWKTojl5BGMbk6FiR%2FcO9I%3D&reserved=0 >>> >>> >>> Antonie: I took the liberty to fold in your patches changes to address >>> my comments on your v1. I pushed an un-squased version of the patches >>> here: >>> https://eur01.safelinks.protection.outlook.com/? >>> url=https%3A%2F%2Fgitlab.freedesktop.org%2Flinux- >>> media%2Fusers%2Fjmondi%2F-%2Ftree%2Fb4%2Fextensible-stats- >>> unsquashed&data=05%7C02%7Cantoine.bouyer%40nxp.com%7Cd0e9f403856c4146996308deaab05cd1%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C639135871605775020%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=iF2BE0GZ8HcVPmOJDhbmLsXQDOXV9JvqfMK6DRPPvrg%3D&reserved=0 >>> >>> so you can easily get the diff from this and your version. Please feel >>> free to comment on these as you're the original author. >> >> Hi Jacopo >> >> Thanks for the rework and the links. I'm fine with your [SQUASH] >> commits. >> >> If there are no other comments, I assume I can reuse the common patches >> in my v2 then, and also apply the new helpers to neoisp driver changes. >> They look very useful (especially to prevent out-of-bounds crashes I >> observed when data_size was not set before filling stats :( ). I'll >> check in your user example. >> >> BR >> Antoine > > Hi Jacopo > > Do you think it would make sense to create a new generic V4L2_META_FMT > too ? which can be used by all user of v4l2-isp extensible params a/o > stats. To avoid each driver creating its own meta fmt with same purpose. > > Or do you think it could have side effects ? > > BR > Antoine > >> I think this proposal is excellent. 🙂 >>> >>> Signed-off-by: Jacopo Mondi >>> --- >>> Antoine Bouyer (2): >>>        media: uapi: v4l2-isp: Add extensible statistics >>>        media: Documentation: uapi: Update V4L2 ISP for extensible stats >>> >>> Jacopo Mondi (4): >>>        media: v4l2-isp: Rename v4l2_isp_params_buffer_size >>>        media: v4l2-isp: Add per-block validation callback >>>        media: amlogic-c3: Implement per-block validation >>>        media: v4l2-isp: Add helpers for stats buffer >>> >>>   Documentation/userspace-api/media/v4l/v4l2-isp.rst |  45 ++++++-- >>>   .../media/platform/amlogic/c3/isp/c3-isp-params.c  |  42 ++++++- >>>   .../media/platform/arm/mali-c55/mali-c55-params.c  |  12 +- >>>   drivers/media/v4l2-core/v4l2-isp.c                 |  56 +++++++++ >>>   include/media/v4l2-isp.h                           |  94 +++++++++++ >>> ++--- >>>   include/uapi/linux/media/v4l2-isp.h                | 125 +++++++++++ >>> ++-------- >>>   6 files changed, 294 insertions(+), 80 deletions(-) >>> --- >>> base-commit: d9c8c4adf23d17549c0ec9c85b99d85a0ee6cf18 >>> change-id: 20260504-extensible-stats-f2d6befcc1ce >>> >>> Best regards, >>> -- >>> Jacopo Mondi >>> >> >