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authorWang Xingchao <xingchao.wang@linux.intel.com>2013-05-30 22:07:10 +0800
committerDaniel Vetter <daniel.vetter@ffwll.ch>2013-06-06 17:31:56 +0200
commit99a2008d0b32d72dfc2a54e7be1eb698dd2e3bd6 (patch)
treea4966a9b0e4c03e329875c17e998959e8a394e1b /sound/pci/hda/Kconfig
parent5c90680e42b08a1e4a6800ca02e75ad201f8037f (diff)
downloadlinux-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/Kconfig10
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