[alsa-devel] [PATCH 3/3] sound: don't call skl_init_chip() to reset intel skl soc

[Takashi Iwai]

On Mon, 10 Sep 2018 23:23:58 +0200,
Yu Zhao wrote:
> 
> Internally, skl_init_chip() calls snd_hdac_bus_init_chip() which
> 1) sets bus->chip_init to prevent multiple entrances before device
> is stopped; 2) enables interrupt.
> 
> We shouldn't use it for the purpose of resetting device only because
> 1) when we really want to initialize device, we won't be able to do
> so; 2) we are ready to handle interrupt yet, and kernel crashes when
> interrupt comes in.
> 
> Rename azx_reset() to snd_hdac_bus_reset_link(), and use it to reset
> device properly.
> 
> Fixes: 60767abcea3d ("ASoC: Intel: Skylake: Reset the controller in probe")
> Signed-off-by: Yu Zhao <yuzhao at google.com>

That makes sense.

And I noticed that the legacy HD-audio driver potentially needs the
same reset (although we haven't heard of any problem for years).

So now I wonder whether this requirement of reset is really mandatory
for the real hardware, or just theoretical...

In anyway,

Reviewed-by: Takashi Iwai <tiwai at suse.de>


thanks,

Takashi