linux_dsm_epyc7002/sound/pci
Alex Stanoev ac237c28d5 ALSA: ca0106: Disable IZD on SB0570 DAC to fix audio pops
The Creative Audigy SE (SB0570) card currently exhibits an audible pop
whenever playback is stopped or resumed, or during silent periods of an
audio stream. Initialise the IZD bit to the 0 to eliminate these pops.

The Infinite Zero Detection (IZD) feature on the DAC causes the output
to be shunted to Vcap after 2048 samples of silence. This discharges the
AC coupling capacitor through the output and causes the aforementioned
pop/click noise.

The behaviour of the IZD bit is described on page 15 of the WM8768GEDS
datasheet: "With IZD=1, applying MUTE for 1024 consecutive input samples
will cause all outputs to be connected directly to VCAP. This also
happens if 2048 consecutive zero input samples are applied to all 6
channels, and IZD=0. It will be removed as soon as any channel receives
a non-zero input". I believe the second sentence might be referring to
IZD=1 instead of IZD=0 given the observed behaviour of the card.

This change should make the DAC initialisation consistent with
Creative's Windows driver, as this popping persists when initialising
the card in Linux and soft rebooting into Windows, but is not present on
a cold boot to Windows.

Signed-off-by: Alex Stanoev <alex@astanoev.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-10-29 16:59:06 +01:00
..
ac97 ALSA: pci: Remove empty init and exit 2018-08-03 16:11:48 +02:00
ali5451 ALSA: ali5451: remove redundant pointer 'codec' 2018-07-16 14:30:33 +02:00
asihpi ALSA: asihpi: don't pass GFP_DMA32 to dma_alloc_coherent 2018-10-14 09:40:24 +02:00
au88x0 ALSA: au88xx: Add fall-through annotations 2018-10-12 09:31:34 +02:00
aw2 ALSA: aw2: make snd_pcm_hardware const 2017-08-12 23:31:39 +02:00
ca0106 ALSA: ca0106: Disable IZD on SB0570 DAC to fix audio pops 2018-10-29 16:59:06 +01:00
cs46xx ALSA: cs46xx: Use SNDRV_PCM_INFO_SYNC_APPLPTR info flag 2018-09-04 12:13:40 +02:00
cs5535audio ALSA: cs5535audio: remove redundant pointer 'dma' 2018-08-01 13:59:29 +02:00
ctxfi ALSA: ctxfi: cthw20k2: Replace mdelay() with msleep() and usleep_range() 2018-07-27 11:49:16 +02:00
echoaudio ALSA: echoaudio: Mark expected switch fall-throughs 2018-08-06 09:33:45 +02:00
emu10k1 Merge branch 'for-linus' into for-next 2018-10-04 07:53:06 +02:00
hda ASoC: Updates for v5.0/v4.20 2018-10-22 23:26:37 +02:00
ice1712 ALSA: pci: Remove empty init and exit 2018-08-03 16:11:48 +02:00
korg1212 ALSA: korg1212: Add __force annotation to cast in user-copy callbacks 2018-07-26 08:33:08 +02:00
lola ALSA: lola: Proper endian notations 2018-07-27 09:06:05 +02:00
lx6464es ALSA: lx6464es: Missing error code in snd_lx6464es_create() 2018-06-21 11:04:42 +02:00
mixart ALSA: mixart: Mark expected switch fall-through 2018-08-09 08:52:04 +02:00
nm256 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
oxygen ALSA: oxygen: use match_string() helper 2018-05-31 19:42:48 +02:00
pcxhr sound: Use octal not symbolic permissions 2018-05-28 11:27:20 +02:00
riptide ALSA: riptide: Properly endian notations 2018-07-27 09:06:02 +02:00
rme9652 ALSA: hdspm: fix spelling mistake "Initializeing" -> "Initializing" 2018-08-27 11:05:39 +02:00
trident ALSA: trident: Proper endian notations 2018-07-27 09:06:00 +02:00
vx222 ALSA: vx222: Fix invalid endian conversions 2018-07-26 08:23:28 +02:00
ymfpci ALSA: ymfpci: Proper endian notations 2018-07-27 09:05:58 +02:00
ad1889.c ALSA: ad1889: Replace mdelay with usleep_range in snd_ad1889_ac97_ready 2018-04-16 13:49:09 +02:00
ad1889.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ak4531_codec.c ALSA: pci: Drop superfluous ifdef CONFIG_PROC_FS 2015-05-29 08:00:06 +02:00
als300.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
als4000.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
atiixp_modem.c ALSA: atiixp_modem: Proper endian notations 2018-07-27 09:06:13 +02:00
atiixp.c ALSA: atiixp: fix fall-through annotations 2018-09-14 15:27:04 +02:00
azt3328.c ALSA: azt3328: Constify hw_constraints 2017-06-09 10:42:49 +02:00
azt3328.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bt87x.c ALSA: bt87x: Proper endian notations 2018-07-27 09:06:11 +02:00
cmipci.c ALSA: cmipci: Allocate with GFP_KERNEL instead of GFP_ATOMIC 2018-04-16 14:01:31 +02:00
cs4281.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
cs5530.c
ens1370.c ALSA: ens137x: remove redundant array pcm_devs 2018-08-01 13:59:58 +02:00
ens1371.c
es1938.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
es1968.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
fm801.c ALSA: fm801: add error handling for snd_ctl_add 2018-06-11 15:21:19 +02:00
intel8x0.c ALSA: intel8x0: Fix fall-through annotations 2018-10-03 17:42:55 +02:00
intel8x0m.c ALSA: intel8x0m: Register irq handler after register initializations 2018-09-13 07:58:43 +02:00
Kconfig docs: Fix some broken references 2018-06-15 18:10:01 -03:00
maestro3.c ALSA: maestro3: Proper endian notations 2018-07-27 09:06:08 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rme32.c ALSA: rme32: Use SNDRV_PCM_INFO_SYNC_APPLPTR info flag 2018-09-04 12:13:09 +02:00
rme96.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
sis7019.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
sis7019.h
sonicvibes.c ALSA: sonicvibes: remove redundant pointer 'dir' 2018-08-01 14:00:13 +02:00
via82xx_modem.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
via82xx.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00