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

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Date:	Wed, 26 Aug 2015 10:00:36 +0100
From:	Liam Girdwood <liam.r.girdwood@...ux.intel.com>
To:	"Jie, Yang" <yang.jie@...el.com>
Cc:	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>,
	"Lin, Mengdong" <mengdong.lin@...el.com>
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

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