HDA Firmware file question

HDA Firmware file question

[David Henningsson]

Hi,

As seen in the "Early Patching" section of the "More notes on HD-Audio 
driver" document, you're supposed to activate it like this:

options snd-hda-intel patch=on-board-patch,hdmi-patch

But how do we know the order here? The pci bus is probed in parallel 
(right?) so could this be racy, that on every other boot, the hdmi card 
is probed first instead?

Also, since the patch file specifies a [codec] section, you could 
actually use the same patch file for almost all cases. I guess the case 
of having two card instances with the same codec at the same address is 
pretty unusual, right?

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic

Re: HDA Firmware file question

[Takashi Iwai]

At Thu, 17 Nov 2011 10:37:32 +0100,
David Henningsson wrote:
> 
> Hi,
> 
> As seen in the "Early Patching" section of the "More notes on HD-Audio 
> driver" document, you're supposed to activate it like this:
> 
> options snd-hda-intel patch=on-board-patch,hdmi-patch
> 
> But how do we know the order here? The pci bus is probed in parallel 
> (right?) so could this be racy, that on every other boot, the hdmi card 
> is probed first instead?

IIRC, the probing order in the driver is serialized, so it doesn't
vary, just depending on the PCI slots.  In practice, I've never seen
any order changes.

> Also, since the patch file specifies a [codec] section, you could 
> actually use the same patch file for almost all cases. I guess the case 
> of having two card instances with the same codec at the same address is 
> pretty unusual, right?

Right.  You must specify the codec SSID, and this should be unique
enough for identify each instance.


thanks,

Takashi