On Fri, May 29, 2020 at 11:25:44AM +0200, Bruno Flueckiger wrote:
> Hi,
> 
> My brand new laptop HP EliteBook 850 G6 comes with an Intel 300 Series
> HD Audio device rev 0x11. The device shows up as not configured in the
> dmesg. The PCI config space of the device identifies its subclass as
> PCI_SUBCLASS_MULTIMEDIA_AUDIO instead of PCI_SUBCLASS_MULTIMEDIA_HDAUDIO
> 
> The patch below makes the device work just fine on my laptop.
> 
> Cheers,
> Bruno

I think it would be better to match on the id in that case as non-azalia
devices use the audio class.

Index: azalia.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/azalia.c,v
retrieving revision 1.255
diff -u -p -r1.255 azalia.c
--- azalia.c    18 Apr 2020 21:55:56 -0000      1.255
+++ azalia.c    29 May 2020 09:51:06 -0000
@@ -474,6 +474,10 @@ azalia_configure_pci(azalia_t *az)
        }
 }
 
+const struct pci_matchid azalia_pci_devices[] = {
+       { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_300SERIES_U_HDA }
+};
+
 int
 azalia_pci_match(struct device *parent, void *match, void *aux)
 {
@@ -483,7 +487,8 @@ azalia_pci_match(struct device *parent, 
        if (PCI_CLASS(pa->pa_class) == PCI_CLASS_MULTIMEDIA
            && PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_MULTIMEDIA_HDAUDIO)
                return 1;
-       return 0;
+       return pci_matchbyid((struct pci_attach_args *)aux, azalia_pci_devices,
+           nitems(azalia_pci_devices));
 }
 
 void

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