From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CB12C43387 for ; Fri, 11 Jan 2019 14:58:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6AB8E20874 for ; Fri, 11 Jan 2019 14:58:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547218688; bh=vM62qAnFecUmuvbBauVtw/rgXu/Ayyo1Tcq01BHNOqc=; h=Subject:To:Cc:References:From:Date:In-Reply-To:List-ID:From; b=a3wLqJ9fXzK2Hec/q8/pIVw9JHesFN0T7NsUlzIojMsXg3kV/PvKxM19EexoNQu7f uSLtA1zVb7lZDrpKtQwzPiJB9fCflosGMIxT6VznxWEzDOLOIEFxR2vO+CIV51+3x2 xZcZYg6pIdrteUWPWpEv3jwYGDiHPyuELreGfygI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390349AbfAKO6B (ORCPT ); Fri, 11 Jan 2019 09:58:01 -0500 Received: from mail.kernel.org ([198.145.29.99]:45294 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732297AbfAKO6B (ORCPT ); Fri, 11 Jan 2019 09:58:01 -0500 Received: from [192.168.1.112] (c-24-9-64-241.hsd1.co.comcast.net [24.9.64.241]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4F31A20872; Fri, 11 Jan 2019 14:58:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547218680; bh=vM62qAnFecUmuvbBauVtw/rgXu/Ayyo1Tcq01BHNOqc=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=H+c8H2xbBV2GJbv6W8q0tntOtku01zGG3Us1bbygJhgUYmD0mTG91Litxfekc/pp2 h6enL8vWpYlg7d+P34tYkXRHqDCpkIvBp1mlcZR6cvJPx3Q6BrqApm5A1D7CNoorNX FStvnL1VwIjf/XTCFf822Wo7d7CE9+17EOv4Jk7o= Subject: Re: [alsa-devel] [PATCH v9 4/4] sound/usb: Use Media Controller API to share media resources To: mchehab@kernel.org Cc: Takashi Iwai , perex@perex.cz, tiwai@suse.com, hverkuil@xs4all.nl, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, shuah References: <2fb40852e4035b2a58010ce7416448918f12804f.1545154778.git.shuah@kernel.org> From: shuah Message-ID: <5f9588b5-657a-78ee-9614-ed0ef1fc5839@kernel.org> Date: Fri, 11 Jan 2019 07:57:49 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On 12/19/18 6:51 AM, Takashi Iwai wrote: > On Tue, 18 Dec 2018 18:59:39 +0100, > shuah@kernel.org wrote: >> >> From: Shuah Khan >> >> Media Device Allocator API to allows multiple drivers share a media device. >> This API solves a very common use-case for media devices where one physical >> device (an USB stick) provides both audio and video. When such media device >> exposes a standard USB Audio class, a proprietary Video class, two or more >> independent drivers will share a single physical USB bridge. In such cases, >> it is necessary to coordinate access to the shared resource. >> >> Using this API, drivers can allocate a media device with the shared struct >> device as the key. Once the media device is allocated by a driver, other >> drivers can get a reference to it. The media device is released when all >> the references are released. >> >> Change the ALSA driver to use the Media Controller API to share media >> resources with DVB, and V4L2 drivers on a AU0828 media device. >> >> The Media Controller specific initialization is done after sound card is >> registered. ALSA creates Media interface and entity function graph nodes >> for Control, Mixer, PCM Playback, and PCM Capture devices. >> >> snd_usb_hw_params() will call Media Controller enable source handler >> interface to request the media resource. If resource request is granted, >> it will release it from snd_usb_hw_free(). If resource is busy, -EBUSY is >> returned. >> >> Media specific cleanup is done in usb_audio_disconnect(). >> >> Signed-off-by: Shuah Khan > > Feel free to take my ack regarding the sound stuff: > Reviewed-by: Takashi Iwai > > > Thanks! > > Takashi > Hi Mauro, Any update on this patch series? thanks, -- Shuah