linux-kernel - Re: [PATCH v2 0/6] media token resource framework

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Date:	Wed, 15 Oct 2014 18:48:08 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Shuah Khan <shuahkh@....samsung.com>
Cc:	m.chehab@...sung.com, akpm@...ux-foundation.org,
	gregkh@...uxfoundation.org, crope@....fi, olebowle@....com,
	dheitmueller@...nellabs.com, hverkuil@...all.nl,
	ramakrmu@...co.com, sakari.ailus@...ux.intel.com,
	laurent.pinchart@...asonboard.com, perex@...ex.cz,
	prabhakar.csengg@...il.com, tim.gardner@...onical.com,
	linux@...elenboom.it, linux-media@...r.kernel.org,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/6] media token resource framework 

At Tue, 14 Oct 2014 08:58:36 -0600,
Shuah Khan wrote:
> 
> Add media token device resource framework to allow sharing
> resources such as tuner, dma, audio etc. across media drivers
> and non-media sound drivers that control media hardware. The
> Media token resource is created at the main struct device that
> is common to all drivers that claim various pieces of the main
> media device, which allows them to find the resource using the
> main struct device. As an example, digital, analog, and
> snd-usb-audio drivers can use the media token resource API
> using the main struct device for the interface the media device
> is attached to.
> 
> This patch series consists of media token resource framework
> and changes to use it in dvb-core, v4l2-core, au0828 driver,
> and snd-usb-audio driver.
> 
> With these changes dvb and v4l2 can share the tuner without
> disrupting each other. Used tvtime, xawtv, kaffeine, and vlc,
> vlc audio capture option, arecord/aplay during development to
> identify v4l2 vb2 and vb1 ioctls and file operations that
> disrupt the digital stream and would require changes to check
> tuner ownership prior to changing the tuner configuration.
> vb2 changes are made in the v4l2-core and vb1 changes are made
> in the au0828 driver to encourage porting drivers to vb2 to
> advantage of the new media token resource framework with changes
> in the core.
> 
> In this patch v2 series, fixed problems identified in the
> patch v1 series. Important ones are changing snd-usb-audio
> to use media tokens, holding tuner lock in VIDIOC_ENUMINPUT,
> and VIDIOC_QUERYSTD.

Just took a quick glance over the patches, and my first concern is why
this has to be lib/*.  This means it's always built-in as long as this
config is enabled (and will be so on distro kernel) even if it's not
used at all.


thanks,

Takashi
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