Intel HDMI probe regression on IVB (and older?)

[Takashi Iwai]

On Mon, 20 Jun 2022 17:31:09 +0200,
Kai Vehmanen wrote:
> 
> Hi,
> 
> On Mon, 20 Jun 2022, Takashi Iwai wrote:
> 
> > So this looks like a bug due to the use of pci_get_class().
> > Since there is no pci_get_base_class(), we likely need to open-code
> > the search, e.g. something like below.
> 
> yes, this indeed seems to be the case.
> 
> > diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
> > index 3f35972e1cf7..161a9711cd63 100644
> > --- a/sound/hda/hdac_i915.c
> > +++ b/sound/hda/hdac_i915.c
> > @@ -119,21 +119,18 @@ static int i915_component_master_match(struct device *dev, int subcomponent,
> [...]
> > -	do {
> > -		display_dev = pci_get_class(class, display_dev);
> > -
> > -		if (display_dev && display_dev->vendor == PCI_VENDOR_ID_INTEL &&
> > +	for_each_pci_dev(display_dev) {
> > +		if (display_dev->vendor == PCI_VENDOR_ID_INTEL &&
> > +		    (display_dev->class >> 16) == PCI_BASE_CLASS_DISPLAY &&
> >  		    connectivity_check(display_dev, hdac_pci)) {
> >  			pci_dev_put(display_dev);
> > -			match = true;
> > +			return true;
> >  		}
> > -	} while (!match && display_dev);
> > +	}
> 
> To open code a bit less, I was first thinking:
> 
> --cut--
> --- a/sound/hda/hdac_i915.c
> +++ b/sound/hda/hdac_i915.c
> @@ -124,9 +124,9 @@ static int i915_gfx_present(struct pci_dev *hdac_pci)
>         bool match = false;
>  
>         do {
> -               display_dev = pci_get_class(class, display_dev);
> +               display_dev = pci_get_device(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, display_dev);
>  
> -               if (display_dev && display_dev->vendor == PCI_VENDOR_ID_INTEL &&
> +               if (display_dev && (display_dev->class >> 16) == PCI_BASE_CLASS_DISPLAY &&
>                     connectivity_check(display_dev, hdac_pci)) {
> --cut--
> 
> But it's a marginal difference, so for your version:
> 
> Reviewed-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>

OK, could you throw the patch to CI for verification?
I can merge it for the next pull request (probably in this week) once
after confirmation. 


thanks,

Takashi