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Message-ID: <1440579636.2443.26.camel@loki>
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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