[alsa-devel] [PATCH] sound/isa: kill pnp_resource_change.

Takashi Iwai tiwai at suse.de
Fri Nov 30 17:27:01 CET 2007

At Fri, 30 Nov 2007 18:07:27 +0100,
Rene Herman wrote:
> On 30-11-07 10:07, Takashi Iwai wrote:
> > At Fri, 30 Nov 2007 01:49:00 +0100,
> > Rene Herman wrote:
> >> Actually, the ALSA drivers with PnPBIOS support (snd-cs4232, snd-es18xx and 
> >> snd-opl3sa2) do not in fact loose any parameters and the few known trouble 
> >> spots there are using
> >>
> >> 	modprobe snd-foo isapnp=0 port=...
> >>
> >> as their workaround, bypassing all of PnP, and this still works completely 
> >> the same as before.
> >>
> >> I do not expect any trouble. A few users might have _mistakingly_ added 
> >> parameters to an ISAPnP only (as in, not also PnPBIOS) driver due to 
> >> googling up your generic bad-advice webforum that said that worked for 
> >> someone with a heavy sounding nickname, but we can deal with that.
> >>
> >> Moreover, as I've been experiencing on the ALSA list for a while now (where 
> >> I've been somewhat responsive to ISA related issues) basically anything but 
> >> PnPBIOS/ACPI ISA is mostly dead and as said, with an isapnp=0 in the drivers 
> >> there which known issues are using, there's no difference.
> >>
> >> Advice is always good, but I'd not put in the ALSA documentation (wrong 
> >> place) and even in the changelog it sounds a bit overly alarming in my own 
> >> opinion. The expected fall-out is... <crickets>...
> > 
> > Hm, but still some notes are needed for ALSA-Configuration.txt
> > mentioning that the resource parameters like port, io, etc can be used
> > only when isapnp=no on some drivers.  The parameters are still there,
> > so people may wonder if it has no use.
> Okay, something like this? Incremental...
> By the way, eventually I'd in fact probably like to move some of the drivers 
> that now still support legacy ISA over to PnP only. After all, chips such as 
> the CMI8330, CS4232+, ES1869+ and OPL3SA2 _are_ PnP only chips.
> Certainly for CS4232+ and ES1869+ that can't be done currently as we know 
> people are in fact using isapnp=0 to work around PnPBIOS issues but from the 
> previous report there it seemed that might actually just consist of the BIOS 
> claiming no resource change is possible, which pnp_activate_dev (through 
> pnp_autoconfig_dev) insist on anyway. This would be something to fix inside 
> PnP instead...

Well, I'm not sure about that.  Certainly there are some users that
use isapnp=no with explicit parameters.

> Anyways, here's just a further Documentation update. You once told me to 
> start new threads for patches, but that seems clumsy now... :-|

Thanks.  It seems that people do care more on explanations about the
removal of options.  Could you add that, too?
Just mention about sysfs as alternative way to change the



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