[alsa-devel] [PATCH 0/2] ASoC: Fix wm97xx touchscreen driver

[Lars-Peter Clausen]

The wm97xx touchscreen driver will bind itself to the snd_ac97 device
registered by CODEC drivers and expects that the device has already been
reset by the CODEC driver. Previous to commit 6794f709b712 ("ASoC: ac97:
Drop delayed device registration") the snd_ac97 device was only registered
after the CODEC driver probe function had finished running, but starting
with the commit it is registered within snd_soc_new_ac97_codec(). This
breaks the touchscreen driver as the reset is no longer performed before the
touchscreen driver probe function runs. This patch series introduces a new
function snd_soc_alloc_ac97_codec() which allocates the snd_ac97 device, but
does not yet register it yet. This allows the CODEC drivers to perform the
reset before the device is registered.

The series is meant to perform a minimum amount of changes while fixing the
issue to prevent introducing other regressions. I have a few more patches
that consolidate the reset handling in the drivers and puts it into the core
in snd_soc_new_ac97_codec() which makes the split in the drivers
unnecessary, but that's something for next and not for stable.

Manuel can you give this another round of testing?

Thanks,
- Lars

Lars-Peter Clausen (2):
  ASoC: Add support for allocating AC'97 device before registering it
  ASoC: wm97xx: Reset AC'97 device before registering it

 include/sound/soc.h       |  1 +
 sound/soc/codecs/wm9705.c | 16 ++++++++++------
 sound/soc/codecs/wm9712.c | 12 ++++++++----
 sound/soc/codecs/wm9713.c | 12 ++++++++----
 sound/soc/soc-ac97.c      | 34 +++++++++++++++++++++++++++++-----
 5 files changed, 56 insertions(+), 19 deletions(-)

-- 
1.8.0