diff options
| author | Wang Xingchao <xingchao.wang@linux.intel.com> | 2013-05-30 22:07:10 +0800 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-06-06 17:31:56 +0200 |
| commit | 99a2008d0b32d72dfc2a54e7be1eb698dd2e3bd6 (patch) | |
| tree | a4966a9b0e4c03e329875c17e998959e8a394e1b /sound/pci/hda/Makefile | |
| parent | 5c90680e42b08a1e4a6800ca02e75ad201f8037f (diff) | |
ALSA: hda - Add power-welll support for haswell HDA
For Intel Haswell chip, HDA controller and codec have
power well dependency from GPU side. This patch added support
to request/release power well in audio driver. Power save
feature should be enabled to get runtime power saving.
There's deadlock when request_module(i915) in azx_probe.
It looks like:
device_lock(audio pci device) -> azx_probe -> module_request
(or symbol_request) -> modprobe (userspace) -> i915 init ->
drm_pci_init -> pci_register_driver -> bus_add_driver -> driver_attach ->
which in turn tries all locks on pci bus, and when it tries the one on the
audio device, it will deadlock.
This patch introduce a work to store remaining probe stuff, and let
request_module run in safe work context.
Signed-off-by: Wang Xingchao <xingchao.wang@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'sound/pci/hda/Makefile')
| -rw-r--r-- | sound/pci/hda/Makefile | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/pci/hda/Makefile b/sound/pci/hda/Makefile index 24a251497a1f..c091438286a3 100644 --- a/sound/pci/hda/Makefile +++ b/sound/pci/hda/Makefile @@ -1,4 +1,6 @@ snd-hda-intel-objs := hda_intel.o +# for haswell power well +snd-hda-intel-$(CONFIG_SND_HDA_I915) += hda_i915.o snd-hda-codec-y := hda_codec.o hda_jack.o hda_auto_parser.o snd-hda-codec-$(CONFIG_SND_HDA_GENERIC) += hda_generic.o |