From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (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 8C5731420A8; Tue, 5 Nov 2024 12:08:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730808539; cv=none; b=jxPL1gdRDm8Ufiv7jdetwnuo+0XF23lDZA34m+SIAIkdzWhREVRxwQ4miGyR/UE5H5ibOiyDktsCgi7Uix6MLTHhFKWHEG1uyT34bfMMYcYGMZ8PJjYStgh8LsvS+Ma3lVeWAeVEwaEpm2N5TSYvNzuWcO0uY3icD2Bjul7XOzU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730808539; c=relaxed/simple; bh=95Qa/TvAACuA2x/3YKK016YgNA7xhuFc6EjqGL19ZVQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Q263Wv3KV96LATRxFTRpMJcc+VFS5xPvDyXVDjfyLkF9G4PUffzBNqiGHRaeGxRoVRuYi1AU72XmRi9C1tWfLUQ6NUtmNSXYhIjAqm4wwVCxsrXcwqsOK6JodJl1h88xPI1gi44mG58a9ByyN7CH3Yedn+qsSCgNzgpj3LWcQKU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=e0JHdOwn; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="e0JHdOwn" Received: from [192.168.88.20] (91-157-155-49.elisa-laajakaista.fi [91.157.155.49]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id C11F24AD; Tue, 5 Nov 2024 13:08:47 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1730808528; bh=95Qa/TvAACuA2x/3YKK016YgNA7xhuFc6EjqGL19ZVQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=e0JHdOwnxozN6BY65vXEN3ofIxPN4aalBqYLzXJeHqnDF4wZilppnX46BKKUCUT2p epHlDNMltMpcuNmTK5XI9GQgXV92N6a9LrCjEz0mC197vIEa3ZnTHRn1Iwor/ZDJoo WWfFb/1008RzL5OnP2yBB+IuvmVSAJSjdUlpspg4= Message-ID: <9becfc3f-1dfa-46d3-8afe-81c8e6b59800@ideasonboard.com> Date: Tue, 5 Nov 2024 14:08:52 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/9] media: platform: Add c3 mipi csi2 driver To: Jacopo Mondi , Keke Li Cc: Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kieran.bingham@ideasonboard.com, laurent.pinchart@ideasonboard.com, dan.scally@ideasonboard.com References: <20240918-c3isp-v3-0-f774a39e6774@amlogic.com> <20240918-c3isp-v3-2-f774a39e6774@amlogic.com> <7c6cdb7b-705c-4744-a28e-866dbda094ac@amlogic.com> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; keydata= xsFNBE6ms0cBEACyizowecZqXfMZtnBniOieTuFdErHAUyxVgtmr0f5ZfIi9Z4l+uUN4Zdw2 wCEZjx3o0Z34diXBaMRJ3rAk9yB90UJAnLtb8A97Oq64DskLF81GCYB2P1i0qrG7UjpASgCA Ru0lVvxsWyIwSfoYoLrazbT1wkWRs8YBkkXQFfL7Mn3ZMoGPcpfwYH9O7bV1NslbmyJzRCMO eYV258gjCcwYlrkyIratlHCek4GrwV8Z9NQcjD5iLzrONjfafrWPwj6yn2RlL0mQEwt1lOvn LnI7QRtB3zxA3yB+FLsT1hx0va6xCHpX3QO2gBsyHCyVafFMrg3c/7IIWkDLngJxFgz6DLiA G4ld1QK/jsYqfP2GIMH1mFdjY+iagG4DqOsjip479HCWAptpNxSOCL6z3qxCU8MCz8iNOtZk DYXQWVscM5qgYSn+fmMM2qN+eoWlnCGVURZZLDjg387S2E1jT/dNTOsM/IqQj+ZROUZuRcF7 0RTtuU5q1HnbRNwy+23xeoSGuwmLQ2UsUk7Q5CnrjYfiPo3wHze8avK95JBoSd+WIRmV3uoO rXCoYOIRlDhg9XJTrbnQ3Ot5zOa0Y9c4IpyAlut6mDtxtKXr4+8OzjSVFww7tIwadTK3wDQv Bus4jxHjS6dz1g2ypT65qnHen6mUUH63lhzewqO9peAHJ0SLrQARAQABzTBUb21pIFZhbGtl aW5lbiA8dG9taS52YWxrZWluZW5AaWRlYXNvbmJvYXJkLmNvbT7CwY4EEwEIADgWIQTEOAw+ ll79gQef86f6PaqMvJYe9QUCX/HruAIbAwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgAAKCRD6 PaqMvJYe9WmFD/99NGoD5lBJhlFDHMZvO+Op8vCwnIRZdTsyrtGl72rVh9xRfcSgYPZUvBuT VDxE53mY9HaZyu1eGMccYRBaTLJSfCXl/g317CrMNdY0k40b9YeIX10feiRYEWoDIPQ3tMmA 0nHDygzcnuPiPT68JYZ6tUOvAt7r6OX/litM+m2/E9mtp8xCoWOo/kYO4mOAIoMNvLB8vufi uBB4e/AvAjtny4ScuNV5c5q8MkfNIiOyag9QCiQ/JfoAqzXRjVb4VZG72AKaElwipiKCWEcU R4+Bu5Qbaxj7Cd36M/bI54OrbWWETJkVVSV1i0tghCd6HHyquTdFl7wYcz6cL1hn/6byVnD+ sR3BLvSBHYp8WSwv0TCuf6tLiNgHAO1hWiQ1pOoXyMEsxZlgPXT+wb4dbNVunckwqFjGxRbl Rz7apFT/ZRwbazEzEzNyrBOfB55xdipG/2+SmFn0oMFqFOBEszXLQVslh64lI0CMJm2OYYe3 PxHqYaztyeXsx13Bfnq9+bUynAQ4uW1P5DJ3OIRZWKmbQd/Me3Fq6TU57LsvwRgE0Le9PFQs dcP2071rMTpqTUteEgODJS4VDf4lXJfY91u32BJkiqM7/62Cqatcz5UWWHq5xeF03MIUTqdE qHWk3RJEoWHWQRzQfcx6Fn2fDAUKhAddvoopfcjAHfpAWJ+ENc7BTQROprNHARAAx0aat8GU hsusCLc4MIxOQwidecCTRc9Dz/7U2goUwhw2O5j9TPqLtp57VITmHILnvZf6q3QAho2QMQyE DDvHubrdtEoqaaSKxKkFie1uhWNNvXPhwkKLYieyL9m2JdU+b88HaDnpzdyTTR4uH7wk0bBa KbTSgIFDDe5lXInypewPO30TmYNkFSexnnM3n1PBCqiJXsJahE4ZQ+WnV5FbPUj8T2zXS2xk 0LZ0+DwKmZ0ZDovvdEWRWrz3UzJ8DLHb7blPpGhmqj3ANXQXC7mb9qJ6J/VSl61GbxIO2Dwb xPNkHk8fwnxlUBCOyBti/uD2uSTgKHNdabhVm2dgFNVuS1y3bBHbI/qjC3J7rWE0WiaHWEqy UVPk8rsph4rqITsj2RiY70vEW0SKePrChvET7D8P1UPqmveBNNtSS7In+DdZ5kUqLV7rJnM9 /4cwy+uZUt8cuCZlcA5u8IsBCNJudxEqBG10GHg1B6h1RZIz9Q9XfiBdaqa5+CjyFs8ua01c 9HmyfkuhXG2OLjfQuK+Ygd56mV3lq0aFdwbaX16DG22c6flkkBSjyWXYepFtHz9KsBS0DaZb 4IkLmZwEXpZcIOQjQ71fqlpiXkXSIaQ6YMEs8WjBbpP81h7QxWIfWtp+VnwNGc6nq5IQDESH mvQcsFS7d3eGVI6eyjCFdcAO8eMAEQEAAcLBXwQYAQIACQUCTqazRwIbDAAKCRD6PaqMvJYe 9fA7EACS6exUedsBKmt4pT7nqXBcRsqm6YzT6DeCM8PWMTeaVGHiR4TnNFiT3otD5UpYQI7S suYxoTdHrrrBzdlKe5rUWpzoZkVK6p0s9OIvGzLT0lrb0HC9iNDWT3JgpYDnk4Z2mFi6tTbq xKMtpVFRA6FjviGDRsfkfoURZI51nf2RSAk/A8BEDDZ7lgJHskYoklSpwyrXhkp9FHGMaYII m9EKuUTX9JPDG2FTthCBrdsgWYPdJQvM+zscq09vFMQ9Fykbx5N8z/oFEUy3ACyPqW2oyfvU CH5WDpWBG0s5BALp1gBJPytIAd/pY/5ZdNoi0Cx3+Z7jaBFEyYJdWy1hGddpkgnMjyOfLI7B CFrdecTZbR5upjNSDvQ7RG85SnpYJTIin+SAUazAeA2nS6gTZzumgtdw8XmVXZwdBfF+ICof 92UkbYcYNbzWO/GHgsNT1WnM4sa9lwCSWH8Fw1o/3bX1VVPEsnESOfxkNdu+gAF5S6+I6n3a ueeIlwJl5CpT5l8RpoZXEOVtXYn8zzOJ7oGZYINRV9Pf8qKGLf3Dft7zKBP832I3PQjeok7F yjt+9S+KgSFSHP3Pa4E7lsSdWhSlHYNdG/czhoUkSCN09C0rEK93wxACx3vtxPLjXu6RptBw 3dRq7n+mQChEB1am0BueV1JZaBboIL0AGlSJkm23kw== In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, On 05/11/2024 13:39, Jacopo Mondi wrote: >>> Could you clarify what other streams you plan to support ? As you >>> support routing I presume you are preparing to capture >>> multiple streams of data like image + embedded data, or to support >>> sensors which sends data on different virtual channels ? >>> >>> How do you see this driver evolve ? Will it be augmented with an >>> additional source pad directed to a video device where to capture >>> embedded data from ? >>> >>> I'm wondering because if PAD_SINK become multiplexed, you won't be >>> allowed to set a format there. It only works now because you have a >>> single stream. >>> >>> Speaking of which, as you prepare to support multiple streams, I would >>> specify the stream number when calling v4l2_subdev_state_get_format(). >>> >>> fmt = v4l2_subdev_state_get_format(state, format->pad, 0); >>> >> Thanks for your suggestion. >> >> But this MIPI CSI2 hardware module doesn't have the ability to separate data >> , such as image + embedded data. >> >> So there are no plans to support other streams. > > I see. Now that I've reviewed the adapter subdevice path I realized > that it's the adapter that can split data based on VC/DT to either the > ISP direct path or to DDR. > > The CSI-2 RX then transports streams as received from the sensor > directly to the adapter. > > In order to support capturing embedded data to DDR in the adapter the > embedded data stream needs a representation in this subdevice as well, > so that the source pad is multiplexed as well and the adapter receives > two streams that it can eventually split. > > > Sensor CSI-2Rx Adapter > +-----------+ +------+ +--------+ > 0-- ED --\ | | | | /->0---> Embedded Data (DDR) > | ->0====>0 ==== 0 ====> 0====| | > 0-- I ---/ | | | | \->0---> Image (ISP) > +-----------+ +------+ +--------+ > > When going to support embedded data capture this driver should create > two routes and allow enabling/disabling the embedded data one. This depends on the hardware. What's the bus between the CSI-2 rx and the adapter? If it's a custom bus that basically allows passing forward anything received from the CSI-2 bus, then the user should be free to configure any routes in the CSI-2 RX subdevice. The adapter subdev, however, as it is limited by the HW, should only support two streams if that is what the hardware supports. > Tomi in cc for inputs. > > For now, if you don't support capturing embedded data, I would remove > routing support from here and from the adapter. Right, if the drivers only support a single stream, just drop the routing support. Tomi