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| 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/Kconfig | |
| parent | 5c90680e42b08a1e4a6800ca02e75ad201f8037f (diff) | |
| download | linux-99a2008d0b32d72dfc2a54e7be1eb698dd2e3bd6.tar.bz2 | |
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/Kconfig')
| -rw-r--r-- | sound/pci/hda/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig index 80a7d44bcf81..c5a872ca7703 100644 --- a/sound/pci/hda/Kconfig +++ b/sound/pci/hda/Kconfig @@ -152,6 +152,16 @@ config SND_HDA_CODEC_HDMI snd-hda-codec-hdmi. This module is automatically loaded at probing. +config SND_HDA_I915 + bool "Build Display HD-audio controller/codec power well support for i915 cards" + depends on DRM_I915 + help + Say Y here to include full HDMI and DisplayPort HD-audio controller/codec + power-well support for Intel Haswell graphics cards based on the i915 driver. + + Note that this option must be enabled for Intel Haswell C+ stepping machines, otherwise + the GPU audio controller/codecs will not be initialized or damaged when exit from S3 mode. + config SND_HDA_CODEC_CIRRUS bool "Build Cirrus Logic codec support" default y |