Re: [RFC/PATCH v6 09/12] media: Entity locking and pipeline management | KernelTrap

Re: [RFC/PATCH v6 09/12] media: Entity locking and pipeline management

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From: Laurent Pinchart

Subject: Re: [RFC/PATCH v6 09/12] media: Entity locking and pipeline management

Date: Thursday, November 25, 2010 - 8:47 am

Hi Mark,

On Thursday 25 November 2010 14:53:51 Mark Brown wrote:
quoted text> On Thu, Nov 25, 2010 at 03:28:16AM +0100, Laurent Pinchart wrote:
> > Link states must not be modified while streaming is in progress on a
> > graph they belong or connect to. The entity locking API helps drivers
> > enforcing that requirement.
> 
> This is not desirable for embedded audio - for example, it is very
> common to wish to switch from headphone to speaker and back mid
> playback, or to move between headset, speakerphone and handset modes on
> a phone.  This is normally implemented by reconfiguring the output paths
> at runtime without interrupting applications.

Agreed. The locking should be made optional. I'll work on that.

-- 
Regards,

Laurent Pinchart
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Messages in current thread:

[RFC/PATCH v6 00/12] Media controller (core and V4L2), Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 01/12] media: Media device node support, Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 02/12] media: Media device, Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 03/12] media: Entities, pads and links, Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 04/12] media: Entity graph traversal, Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 05/12] media: Reference count and power handling, Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 06/12] media: Media device information query, Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 07/12] media: Entities, pads and links enume ..., Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 08/12] media: Links setup, Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 09/12] media: Entity locking and pipeline ma ..., Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 10/12] v4l: Add a media_device pointer to th ..., Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 11/12] v4l: Make video_device inherit from m ..., Laurent Pinchart, (Wed Nov 24, 7:28 pm)

[RFC/PATCH v6 12/12] v4l: Make v4l2_subdev inherit from me ..., Laurent Pinchart, (Wed Nov 24, 7:28 pm)

Re: [RFC/PATCH v6 02/12] media: Media device, Clemens Ladisch, (Thu Nov 25, 2:33 am)

Re: [RFC/PATCH v6 03/12] [alsa-devel] media: Entities, pad ..., Clemens Ladisch, (Thu Nov 25, 2:38 am)

Re: [RFC/PATCH v6 11/12] v4l: Make video_device inherit fr ..., Hans Verkuil, (Thu Nov 25, 4:38 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Mark Brown, (Thu Nov 25, 6:36 am)

Re: [RFC/PATCH v6 03/12] [alsa-devel] media: Entities, pad ..., Mark Brown, (Thu Nov 25, 6:41 am)

Re: [RFC/PATCH v6 05/12] media: Reference count and power ..., Mark Brown, (Thu Nov 25, 6:49 am)

Re: [RFC/PATCH v6 09/12] media: Entity locking and pipelin ..., Mark Brown, (Thu Nov 25, 6:53 am)

Re: [RFC/PATCH v6 00/12] Media controller (core and V4L2), Mark Brown, (Thu Nov 25, 7:28 am)

Re: [RFC/PATCH v6 11/12] v4l: Make video_device inherit fr ..., Laurent Pinchart, (Thu Nov 25, 7:37 am)

Re: [RFC/PATCH v6 02/12] media: Media device, Laurent Pinchart, (Thu Nov 25, 7:42 am)

Re: [RFC/PATCH v6 03/12] [alsa-devel] media: Entities, pad ..., Laurent Pinchart, (Thu Nov 25, 8:21 am)

Re: [RFC/PATCH v6 03/12] [alsa-devel] media: Entities, pad ..., Mark Brown, (Thu Nov 25, 8:28 am)

Re: [RFC/PATCH v6 03/12] [alsa-devel] media: Entities, pad ..., Laurent Pinchart, (Thu Nov 25, 8:29 am)

Re: [RFC/PATCH v6 03/12] [alsa-devel] media: Entities, pad ..., Mark Brown, (Thu Nov 25, 8:35 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Laurent Pinchart, (Thu Nov 25, 8:40 am)

Re: [RFC/PATCH v6 05/12] media: Reference count and power ..., Laurent Pinchart, (Thu Nov 25, 8:43 am)

Re: [RFC/PATCH v6 09/12] media: Entity locking and pipelin ..., Laurent Pinchart, (Thu Nov 25, 8:47 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Mark Brown, (Thu Nov 25, 8:49 am)

Re: [RFC/PATCH v6 05/12] media: Reference count and power ..., Sakari Ailus, (Thu Nov 25, 10:49 am)

Re: [RFC/PATCH v6 05/12] media: Reference count and power ..., Mark Brown, (Thu Nov 25, 2:47 pm)

Re: [RFC/PATCH v6 03/12] [alsa-devel] media: Entities, pad ..., Clemens Ladisch, (Fri Nov 26, 2:10 am)

Re: [RFC/PATCH v6 00/12] Media controller (core and V4L2), Laurent Pinchart, (Fri Nov 26, 7:07 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Laurent Pinchart, (Fri Nov 26, 7:13 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Mark Brown, (Fri Nov 26, 7:14 am)

Re: [RFC/PATCH v6 05/12] media: Reference count and power ..., Laurent Pinchart, (Sun Nov 28, 5:33 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Laurent Pinchart, (Sun Nov 28, 5:34 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Hans Verkuil, (Sun Nov 28, 8:57 am)

Re: [RFC/PATCH v6 05/12] media: Reference count and power ..., Mark Brown, (Sun Nov 28, 11:25 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Laurent Pinchart, (Fri Dec 3, 6:50 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Mark Brown, (Fri Dec 3, 7:54 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Hans Verkuil, (Tue Dec 7, 10:13 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Mark Brown, (Tue Dec 7, 10:55 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Hans Verkuil, (Tue Dec 7, 11:11 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Mark Brown, (Tue Dec 7, 12:03 pm)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Laurent Pinchart, (Thu Dec 9, 5:53 am)

Re: [RFC/PATCH v6 03/12] media: Entities, pads and links, Sakari Ailus, (Fri Dec 10, 9:35 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Clemens Ladisch, (Mon Dec 13, 9:10 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Laurent Pinchart, (Tue Dec 14, 5:00 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pa ..., Hans Verkuil, (Tue Dec 14, 5:40 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Laurent Pinchart, (Tue Dec 14, 5:53 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Clemens Ladisch, (Tue Dec 14, 6:31 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Clemens Ladisch, (Tue Dec 14, 6:49 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Takashi Iwai, (Tue Dec 14, 6:54 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Laurent Pinchart, (Tue Dec 14, 7:25 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Sakari Ailus, (Tue Dec 14, 7:49 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pa ..., Hans Verkuil, (Tue Dec 14, 7:51 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Laurent Pinchart, (Tue Dec 14, 7:57 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Clemens Ladisch, (Tue Dec 14, 8:30 am)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Laurent Pinchart, (Tue Dec 14, 4:50 pm)

Re: [alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pad ..., Hans Verkuil, (Tue Dec 21, 9:49 am)