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| author | Rander Wang <rander.wang@linux.intel.com> | 2019-09-30 16:29:45 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-10-07 03:58:48 +0200 |
| commit | 130bce3afbbbbe585cba8604f2124c28e8d86fb0 (patch) | |
| tree | 90bab407ce5ca116478409761bc9d5e33986df90 /sound/hda/ext | |
| parent | ALSA: hda/realtek: Reduce the Headphone static noise on XPS 9350/9360 (diff) | |
| download | linux-130bce3afbbbbe585cba8604f2124c28e8d86fb0.tar.xz linux-130bce3afbbbbe585cba8604f2124c28e8d86fb0.zip | |
ALSA: hdac: clear link output stream mapping
Fix potential DMA hang upon starting playback on devices in HDA mode
on Intel platforms (Gemini Lake/Whiskey Lake/Comet Lake/Ice Lake). It
doesn't affect platforms before Gemini Lake or any Intel device in
non-HDA mode.
The reset value for the LOSDIV register is all output streams valid.
Clear this register to invalidate non-existent streams when the bus
is powered up.
Signed-off-by: Rander Wang <rander.wang@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190930142945.7805-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda/ext')
| -rw-r--r-- | sound/hda/ext/hdac_ext_controller.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sound/hda/ext/hdac_ext_controller.c b/sound/hda/ext/hdac_ext_controller.c index 211ca85acd8c..cfab60d88c92 100644 --- a/sound/hda/ext/hdac_ext_controller.c +++ b/sound/hda/ext/hdac_ext_controller.c @@ -271,6 +271,11 @@ int snd_hdac_ext_bus_link_get(struct hdac_bus *bus, ret = snd_hdac_ext_bus_link_power_up(link); /* + * clear the register to invalidate all the output streams + */ + snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, + ML_LOSIDV_STREAM_MASK, 0); + /* * wait for 521usec for codec to report status * HDA spec section 4.3 - Codec Discovery */ |