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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 89F17C43387 for ; Fri, 11 Jan 2019 15:00:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6115521848 for ; Fri, 11 Jan 2019 15:00:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391781AbfAKPAA (ORCPT ); Fri, 11 Jan 2019 10:00:00 -0500 Received: from lb1-smtp-cloud9.xs4all.net ([194.109.24.22]:50783 "EHLO lb1-smtp-cloud9.xs4all.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389655AbfAKO76 (ORCPT ); Fri, 11 Jan 2019 09:59:58 -0500 Received: from [IPv6:2001:983:e9a7:1:b51b:802b:6c83:309a] ([IPv6:2001:983:e9a7:1:b51b:802b:6c83:309a]) by smtp-cloud9.xs4all.net with ESMTPA id hyHqgnT3nMWvEhyHrgcVJ1; Fri, 11 Jan 2019 15:59:56 +0100 Subject: Re: [alsa-devel] [PATCH v9 4/4] sound/usb: Use Media Controller API to share media resources To: shuah , mchehab@kernel.org Cc: Takashi Iwai , perex@perex.cz, tiwai@suse.com, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org References: <2fb40852e4035b2a58010ce7416448918f12804f.1545154778.git.shuah@kernel.org> <5f9588b5-657a-78ee-9614-ed0ef1fc5839@kernel.org> From: Hans Verkuil Message-ID: Date: Fri, 11 Jan 2019 15:59:54 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <5f9588b5-657a-78ee-9614-ed0ef1fc5839@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-CMAE-Envelope: MS4wfFkZYbF27O8q+LVhIIrRyxTGO0XRmi7ql17YfW+RJjzQbSivhn3wF2flxqyGOnLpJPEFaXG1OQ1I4Sgmgg8LXyVt4z6uHsnbSuF0S5oK7IsEOmmFNwaV GSB8F50n6W7SYRpFUxg/ZC/LVRRsyFXTfj+e2eXhtZwjyNVQF7VVkjcGpVnyOSznzfk5KhYNlbPf5wcIv4deLpPKVrssCT7OFma+ydYHMA/R5XiTCP4K50ug DSWs+FlWQgQtC5X6cVhD2Cmr0fSHBp+to5tiVItAtCg3s+s96Dld719MZToX50Pz4F4J6HNELKEoim5galVkiNsyt4nX3GjEMq4+kD4Yi7rQFnihgfpko4Cy kOerWCx8XtI6wkqiWTfYpeB9zD1aWIPe535EOM2ycMIGh6QAX37IRFxhL9oCTClCvxXfkAIsbanpHiyKiif5QUFv/be/pdD82RXkJWLMIHne+dAL4OvwT78X Ft6SMdvetTlcO7cf Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/11/19 3:57 PM, shuah wrote: > 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? I'm planning to process this series for 5.1. Haven't gotten around to it yet, but I expect to do this next week. Still going through all the pending patches after the Christmas period :-) Regards, Hans