Messages in this thread | | | Subject | Re: [alsa-devel] [PATCH v9 4/4] sound/usb: Use Media Controller API to share media resources | From | shuah <> | Date | Fri, 11 Jan 2019 08:04:00 -0700 |
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On 1/11/19 7:59 AM, Hans Verkuil wrote: > 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 <shuah@kernel.org> >>>> >>>> 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 <shuah@kernel.org> >>> >>> Feel free to take my ack regarding the sound stuff: >>> Reviewed-by: Takashi Iwai <tiwai@suse.de> >>> >>> >>> 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 >
Hans,
Thanks for a quick reply. No worries. I am recovering from the Christmas and vacation myself. :)
thanks, -- Shuah
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