[PATCH] ALSA: hda/hdmi: always check pin power status in i915 pin fixup

[Takashi Iwai]

On Wed, 26 Aug 2020 19:03:06 +0200,
Kai Vehmanen wrote:
> 
> When system is suspended with active audio playback to HDMI/DP, two
> alternative sequences can happen at resume:
>   a) monitor is detected first and ALSA prepare follows normal
>      stream setup sequence, or
>   b) ALSA prepare is called first, but monitor is not yet detected,
>      so PCM is restarted without a pin,
> 
> In case of (b), on i915 systems, haswell_verify_D0() is not called at
> resume and the pin power state may be incorrect. Result is lack of audio
> after resume with no error reported back to user-space.
> 
> Fix the problem by always verifying converter and pin state in the
> i915_pin_cvt_fixup().
> 
> BugLink: https://github.com/thesofproject/linux/issues/2388
> Signed-off-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>

Applied with Cc to stable now.  Thanks.


Takashi