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ALSA: hdac: clear link output stream mapping

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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 <[email protected]>
Signed-off-by: Pierre-Louis Bossart <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Rander Wang 2019-09-30 09:29:45 -05:00 • committed by Takashi Iwai
commit 130bce3afb
2 changed files with 8 additions and 0 deletions
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5
sound/hda/ext/hdac_ext_controller.c
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@ -270,6 +270,11 @@ 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