Re: [PATCH 3/3] ALSA: hda: allow direct complete with a powered-off GPU

[Takashi Iwai <tiwai@suse.de>]

On Wed, 12 Aug 2026 15:45:27 +0200,
Takashi Iwai wrote:
> 
> On Wed, 12 Aug 2026 14:22:06 +0200,
> Andre Eikmeyer wrote:
> > 
> > +static bool azx_vga_is_powered_off(struct azx *chip)
> > +{
> > +#ifdef SUPPORT_VGA_SWITCHEROO
> > +	struct pci_dev *pci;
> > +	bool powered_off = false;
> > +
> > +	if (!use_vga_switcheroo(container_of(chip, struct hda_intel, chip)))
> > +		return false;
> > +
> > +	pci = get_bound_vga(chip->pci);
> > +	if (pci) {
> > +		powered_off = pm_runtime_suspended(&pci->dev) &&
> > +			vga_switcheroo_get_client_state(pci) == VGA_SWITCHEROO_OFF;
> > +		pci_dev_put(pci);
> > +	}
> > +
> > +	return powered_off;
> > +#else
> > +	return false;
> > +#endif
> > +}
> 
> This ifdef can be moved to the caller side below...
> 
> > +
> >  static int azx_prepare(struct device *dev)
> >  {
> >  	struct snd_card *card = dev_get_drvdata(dev);
> > @@ -1025,6 +1048,10 @@ static int azx_prepare(struct device *dev)
> >  		return 0;
> >  
> >  	chip = card->private_data;
> > +	/* A powered-off dGPU cannot signal HDA wake events. */
> > +	if (azx_vga_is_powered_off(chip))
> > +		return 1;
> > +
> 
> ... to wrap the call site, instead.  Since this is the only caller,
> having the conditional here would make the intention clearer.

Looking at the code again, this won't work well.

But, keeping vga_switcheroo-specific code in a single place would be
still meaningful.  So,

 #ifdef SUPPORT_VGA_SWITCHEROO
 #define use_vga_switcheroo(chip)	((chip)->use_vga_switcheroo)
 #define needs_eld_notify_link(chip)	((chip)->bus.keep_power)
+static bool azx_vga_is_powered_off(struct azx *chip);
 #else
 #define use_vga_switcheroo(chip)	0
 #define needs_eld_notify_link(chip)	false
+#define azx_vga_is_powered_off(chip)	false
 #endif

and then define azx_vga_is_powered_off() in the section for
vga_switcheroo code.

In anyway, it's a matter of taste, and if the resultant patch doesn't
look better, you can keep the original way, too.


thanks,

Takashi