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* AC97 problems with pxa...
@ 2010-04-06 21:50 Jakob Viketoft
  2010-04-07  2:09 ` Eric Miao
  2010-04-07  7:50 ` Marek Vasut
  0 siblings, 2 replies; 17+ messages in thread
From: Jakob Viketoft @ 2010-04-06 21:50 UTC (permalink / raw)
  To: linux-arm-kernel

Hello!

I'm trying to add sound support to a Toradex Colibri 270 v2 card, but
have run into some strangeness which I don't quite understand. The v2 of
this card uses the WM9712 codec and I've written a machine driver to tie
the codec and the pxa2xx-ac97 driver together. I'm using the 2.6.33.1
kernel and my machine driver is a simplified version of the tosa driver
(no power management or headphone jack logic). However, I get two problems:
1. Internal clock and headphone output is turned off in the
AC97_POWERDOWN register and I can't see where to (properly) turn it on,
neither in kernel space or in userland. No-one else using this codec
seem to be doing it.
2. The init function defined in my snd_soc_card struct doesn't seem to
get called, resulting in way too many mixer settings (I have a number of
snd_soc_dapm_nc_pin calls) with alsa, but might it also have something
to do with problem 1?

When explicitly writing 0 (the ugly way) to the AC97_POWERDOWN register
I get perfect sound output, but I would like to do it the right way.

Two error reports from the dmesg output that might be relevant:
* pxa2xx_ac97_try_cold_reset: cold reset timeout (GSR=0x44)
* Error: Driver 'pxa2xx-ac97' is already registered, aborting...

The AC97 interface is added in the machine initialization through the
pxa_set_ac97_info() in the same way as tosa and many others and this
could explain the second error message...

Any insight would be appreciated!

Regards,

	/Jakob

^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2010-04-08 15:07 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-04-06 21:50 AC97 problems with pxa Jakob Viketoft
2010-04-07  2:09 ` Eric Miao
2010-04-07  9:13   ` Jakob Viketoft
2010-04-07 19:08     ` Marek Vasut
2010-04-07  7:50 ` Marek Vasut
2010-04-07  9:37   ` Jakob Viketoft
2010-04-07  9:54     ` Mark Brown
2010-04-08  9:17       ` Jakob Viketoft
2010-04-08  9:54         ` Mark Brown
2010-04-08 13:05           ` Jakob Viketoft
2010-04-08 13:49             ` Mark Brown
2010-04-08 14:05               ` Jakob Viketoft
2010-04-08 14:12                 ` Mark Brown
2010-04-08 14:35                   ` Jakob Viketoft
2010-04-08 14:44                     ` Mark Brown
2010-04-08 15:07                       ` Jakob Viketoft
2010-04-08 14:06               ` Jakob Viketoft

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