linux-kernel - Re: Problems loading firmware using built-in drivers with kernels that use initramfs.

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Date:	Thu, 27 Aug 2015 08:09:17 +0100
From:	Liam Girdwood <liam.r.girdwood@...ux.intel.com>
To:	"Lin, Mengdong" <mengdong.lin@...el.com>
Cc:	"Jie, Yang" <yang.jie@...el.com>, Takashi Iwai <tiwai@...e.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	"joonas.lahtinen@...ux.intel.com" <joonas.lahtinen@...ux.intel.com>,
	Tom Gundersen <teg@...m.no>, Ming Lei <ming.lei@...onical.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kay Sievers <kay@...y.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Luis Rodriguez <mcgrof@...not-panic.com>,
	lkml <linux-kernel@...r.kernel.org>,
	yalin wang <yalin.wang2010@...il.com>
Subject: Re: Problems loading firmware using built-in drivers with kernels
 that use initramfs.

On Thu, 2015-08-27 at 01:50 +0000, Lin, Mengdong wrote:
> > -----Original Message-----
> > From: Liam Girdwood [mailto:liam.r.girdwood@...ux.intel.com]
> > Sent: Wednesday, August 26, 2015 5:01 PM
> > To: Jie, Yang
> > Cc: Takashi Iwai; Dmitry Torokhov; Luis R. Rodriguez;
> > joonas.lahtinen@...ux.intel.com; Tom Gundersen; Ming Lei; Al Viro; Greg
> > Kroah-Hartman; Kay Sievers; Linus Torvalds; David Woodhouse; Luis Rodriguez;
> > lkml; yalin wang; Lin, Mengdong
> > Subject: Re: Problems loading firmware using built-in drivers with kernels that
> > use initramfs.
> > 
> > On Wed, 2015-08-26 at 08:29 +0000, Jie, Yang wrote:
> > > > -----Original Message-----
> > > > From: Liam Girdwood [mailto:liam.r.girdwood@...ux.intel.com]
> > 
> > > > I think the options are to either :-
> > > >
> > > > 1) Don not support audio DSP drivers using topology data as built-in
> > drivers.
> > > > Audio is not really a critical system required for booting anyway.
> > > >
> > > > 2) Create a default PCM for every driver that has topology data on
> > > > the assumption that every sound card will at least 1 PCM. This PCM
> > > > can then be re-configured when the FW is loaded.
> > >
> > > Yep, this case is quite similar with what Linus described.
> > >
> > > Is it possible that we can probe pcm device after firmware is loaded
> > > for this case?
> > >
> > 
> > The PCM devices are defined in the topology data so it is only possible to
> > create the PCM device *after* the firmware is loaded in these drivers.
> > 
> > Liam
> 
> It seems this can prevent audio device driver in built-in mode to use topology drivers.
> 
> If topology is present, the vendor driver also uses request_firmware() to load the topology data file in the probe phase. Then ASoC core will create the sound card and its PCM devices. 
> 
> Shall we force the device drivers that depends on topology to be configured as modules?

Yes, this is probably the best/quickest solution for the short term
until we can implement and test option 2.

Liam

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