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a=rsa-sha256; c=relaxed/relaxed; d=perex.cz; s=default; t=1714489428; bh=tfwEdotKFhHtxy67tu8o4kix/SP/ziAv/Bxku/BiYns=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=f0+gfas+M7I2y1QsjdNFKJlAS6e550mEaQcY7J1U3J+TTc7QSds1QH985OjXPSt4N iYZNwl05tLTRfpvlyAuEd/eJT0C7Xo5DpFnsh2w8sy9Q6GtH3+63I7eMAwBlspQSrI v++pRdoEfWz0pKXNfZONsjhhBZUJ4uZnWCXSdVfU= Received: from [192.168.100.98] (unknown [192.168.100.98]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: perex) by mail1.perex.cz (Perex's E-mail Delivery System) with ESMTPSA; Tue, 30 Apr 2024 17:03:30 +0200 (CEST) Message-ID: <394d35bd-f58d-4b13-8790-4d7db2f7d14e@perex.cz> Date: Tue, 30 Apr 2024 17:03:28 +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 v15 00/16] Add audio support in v4l2 framework Content-Language: en-US To: Mark Brown , Sebastian Fricke Cc: Shengjiu Wang , hverkuil@xs4all.nl, sakari.ailus@iki.fi, tfiga@chromium.org, m.szyprowski@samsung.com, mchehab@kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, shengjiu.wang@gmail.com, Xiubo.Lee@gmail.com, festevam@gmail.com, nicoleotsuka@gmail.com, lgirdwood@gmail.com, tiwai@suse.com, alsa-devel@alsa-project.org, linuxppc-dev@lists.ozlabs.org References: <1710834674-3285-1-git-send-email-shengjiu.wang@nxp.com> <20240430082112.jrovosb6lgblgpfg@basti-XPS-13-9310> From: Jaroslav Kysela Autocrypt: addr=perex@perex.cz; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 30. 04. 24 16:46, Mark Brown wrote: >> So instead of hammering a driver into the wrong destination, I would >> suggest bundling our forces and implementing a general memory-to-memory >> framework that both the media and the audio subsystem can use, that >> addresses the current shortcomings of the implementation and allows you >> to upload the driver where it is supposed to be. > > That doesn't sound like an immediate solution to maintainer overload > issues... if something like this is going to happen the DRM solution > does seem more general but I'm not sure the amount of stop energy is > proportionate. The "do what you want" ALSA's hwdep device / interface can be used to transfer data in/out from SRC using custom read/write/ioctl/mmap syscalls. The question is, if the changes cannot be more simpler for the first implementation keeping the hardware enumeration in one subsystem where is the driver code placed. I also see the benefit to reuse the already existing framework (but is v4l2 the right one?). Jaroslav -- Jaroslav Kysela Linux Sound Maintainer; ALSA Project; Red Hat, Inc.