[Intel-gfx] [PATCH 1/2] ALSA: hda: Release controller display power during shutdown/reboot

[Takashi Iwai]

On Wed, 23 Jun 2021 15:46:00 +0200,
Imre Deak wrote:
> 
> Make sure the HDA driver's display power reference is released during
> shutdown/reboot.
> 
> During the shutdown/reboot sequence the pci device core calls the
> pm_runtime_resume handler for all devices before calling the driver's
> shutdown callback and so the HDA driver's runtime resume callback will
> acquire a display power reference (on HSW/BDW). This triggers a power
> reference held WARN on HSW/BDW in the i915 driver's subsequent shutdown
> handler, which expects all display power references to be released by
> that time.
> 
> Since the HDA controller is stopped in the shutdown handler in any case,
> let's follow here the same sequence as the one during runtime suspend.
> This will also reset the HDA link and drop the display power reference,
> getting rid of the above WARN.
> 
> Tested on HSW.
> 
> v2:
> - Fix the build for CONFIG_PM=n (Takashi)
> - s/__azx_runtime_suspend/azx_shutdown_chip/
> 
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/3618
> References: https://lore.kernel.org/lkml/cea1f9a-52e0-b83-593d-52997fe1aaf6@er-systems.de
> Reported-and-tested-by: Thomas Voegtle <tv at lio96.de>
> Cc: Takashi Iwai <tiwai at suse.de>
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Thanks, applied both patches now.


Takashi