From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 B078153CA7C for ; Thu, 17 Sep 2026 13:47:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789652880; cv=none; b=MqRLHZRpaRW05HNDVdfYFZvn5uvn9EAUbHSE5Thly1FfMfHdBcdlq/PlM92giE251eNHNzBFHXp3TibW5p3WbWWWrgWgouPGI9kr9yejUZ/QX7J4mW7QfviHB/9TIIyHM4oot7m+o7sDz5is6sMShHaoW8Ts/LF55rT0hsYc//U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789652880; c=relaxed/simple; bh=P2hV0y0nb26p9IX88yEtzlgy7HL8M9xKfEvZ3LcR/4M=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=Xj5FDhnx2Zjo6NUJse2rdgHz3hjvKu4wrUATt6Iz8wU0jzK9cj1kr7grkTpAZenadacuUfog07DMni2Z9T44o1PvRSEl9f78fjikryQoDG1UhujP8xYcLayuPMC1pODSeMWoe3sB9R/uVaoBCT656/2AjYiMkd+0S0+J8RnXq2M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IClmEZMK; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="IClmEZMK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C64511F000FF; Thu, 17 Sep 2026 13:47:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789652874; bh=OcmsW/7ZQFeO34yWEbutBMNLv0dNzIDqPm/Zk4j++uo=; h=Date:Subject:To:References:From:In-Reply-To; b=IClmEZMKXX6XWMqehL7S4jy7Tk3RxutundDHEJzpaLqROKxnvPFSwashjcDNtm7vE 6l52Eh44ovjDvN79eBVu3149t01J3GjKwREoKOotzM6VtiNCAFx9vtS3s9J1FByuGo Klj/rDMAKk5yXSnsNXQmmgMJNTYXmJXaIJP6TTBlKy4fn+eFLtp9hSLV+CvNXh4tkV MsCAWFy7T7+TxMYBQ3gtMtqGofnBlvz3WmzAHY2SzUL8tyaZeaaEjEsu1MbC/5rjez W6hVzDqVbl60qwRITuo4hAXDX7BnQi3UlqgpMo9a4LK4k2VGc3wbKzHXscBApKpoZK fg5z/SxTdeJnQ== Message-ID: <00cc46b2-0729-46d3-8e3b-ea717ec1675e@kernel.org> Date: Thu, 17 Sep 2026 14:47:52 +0100 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [ANNOUNCEMENT] Camera & ISP at Linux Plumbers Conference To: Laurent Pinchart , libcamera-devel@lists.libcamera.org, linux-media@vger.kernel.org References: <20260914233810.GA2796257@killaraus.ideasonboard.com> From: Bryan O'Donoghue Content-Language: en-GB Autocrypt: addr=bod@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 15/09/2026 00:38, Laurent Pinchart wrote: > We can consider scheduling a third topic. Proposals are welcome. From my LPC submission: "Should offline ISPs be implemented in drm/accel" Where does an offline Camera ISP belong in video4linux or in DRM and why ? There are two main types of ISP - inline and offline. An inline ISP takes sensor input directly and produces some kind of processed image on the output. This is a natural fit for v4l2. An offline ISP takes a memory buffer given to it and processes that buffer against supplied parameters. This model can be implemented as a video4linux m2m device but it could also be implemented as a DRM device and included in the DAG. Taking Qualcomm SoCs as an example the Camera hardware provides two types of ISP. An inline processing engine IFE and an offline processing engine based on firmware ICP/HFI. A use-case emerges to implement the inline ISP in v4l2 and the offline in drm/accel. Some tension with this design would exist as user-space would have to be involved to update ISP parameters and process statistics. Another tension is including a firmware based system in dma-fencing including watchdogging and resetting if required. There are clear benefits to having a loop of NPU/DSP to Offline ISP to Display that drm/accel seems to offer some interesting solutions to. --- bod