linux/sound
Takashi Iwai a52ff34e5e ALSA: hda - Manage power well properly for resume
For SKL and later Intel chips, we control the power well per codec
basis via link_power callback since the commit [03b135cebc47: ALSA:
hda - remove dependency on i915 power well for SKL].
However, there are a few exceptional cases where the gfx registers are
accessed from the audio driver: namely the wakeup override bit
toggling at (both system and runtime) resume.  This seems causing a
kernel warning when accessed during the power well down (and likely
resulting in the bogus register accesses).

This patch puts the proper power up / down sequence around the resume
code so that the wakeup bit is fiddled properly while the power is
up.  (The other callback, sync_audio_rate, is used only in the PCM
callback, so it's guaranteed in the power-on.)

Also, by this proper power up/down, the instantaneous flip of wakeup
bit in the resume callback that was introduced by the commit
[033ea349a7cd: ALSA: hda - Fix Skylake codec timeout] becomes
superfluous, as snd_hdac_display_power() already does it.  So we can
clean it up together.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96214
Fixes: 03b135cebc ('ALSA: hda - remove dependency on i915 power well for SKL')
Cc: <stable@vger.kernel.org> # v4.2+
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-08-10 15:05:17 +02:00
..
aoa ALSA: aoa-soundbus: Switch to dev_pm_ops 2015-08-05 16:47:47 +02:00
arm ALSA: arm: Fix empty menuconfig SND_ARM 2016-08-01 16:07:53 +02:00
atmel ALSA: sound/atmel/ac97c.c: remove unused variable 2015-05-20 06:18:25 +02:00
core ASoC: Updates for v4.8 2016-07-26 10:35:31 +02:00
drivers ALSA: dummy: Fix a use-after-free at closing 2016-06-24 15:18:32 +02:00
firewire ALSA: firewire-lib: change a member of event structure to suppress sparse wanings to bool type 2016-05-18 16:32:09 +02:00
hda ALSA: hda: Fix krealloc() with __GFP_ZERO usage 2016-08-03 15:17:22 +02:00
i2c ALSA: ak4114: remove redundant check on err being < 0 2016-07-12 12:28:04 +02:00
isa ALSA: adlib: Utilize the module_isa_driver macro 2016-06-01 07:35:52 +02:00
mips ALSA: Remove deprecated AU1X00 AC97 driver 2016-02-08 08:17:15 +01:00
oss sound: oss: Use kernel_read_file_from_path() for mod_firmware_load() 2016-07-26 10:38:03 +02:00
parisc ALSA: Include linux/io.h instead of asm/io.h 2015-01-28 16:49:33 +01:00
pci ALSA: hda - Manage power well properly for resume 2016-08-10 15:05:17 +02:00
pcmcia
ppc ALSA: ppc/awacs: shut up maybe-uninitialized warning 2016-07-05 08:35:49 +02:00
sh ALSA: sh: aica: Remove deprecated create_workqueue 2016-06-07 11:23:33 +02:00
soc Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux 2016-08-01 21:44:08 -04:00
sparc ALSA: Add missing dependency on CONFIG_SND_TIMER 2016-01-27 07:10:38 +01:00
spi ALSA: at73c213: manage SSC clock 2016-01-20 09:59:27 +01:00
synth ALSA: emux: constify nrpn_conv_table structures 2016-01-06 10:19:49 +01:00
usb ALSA: usb-audio: Add quirk for ELP HD USB Camera 2016-08-09 08:49:18 +02:00
Kconfig ALSA: hda - Make snd_hda_bus_type public 2015-03-23 13:15:51 +01:00
Makefile sound: oss: Use kernel_read_file_from_path() for mod_firmware_load() 2016-07-26 10:38:03 +02:00
ac97_bus.c ASoC: Updates for v4.3 2015-08-31 16:25:22 +02:00
last.c
sound_core.c sound: fix check for error condition of register_chrdev() 2015-11-07 11:14:30 +01:00