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audiohda: detect hda devices using pci class id

--- a/sys/src/9/pc/audiohda.c

+++ b/sys/src/9/pc/audiohda.c

@@ -1758,7 +1758,9 @@

 static Pcidev*

 hdamatch(Pcidev *p)

 {

-	while(p = pcimatch(p, 0, 0))

+	while(p = pcimatch(p, 0, 0)){

+		if(p->ccrb == 0x04 && p->ccru == 0x03)

+			return p;

 		switch((p->vid << 16) | p->did){

 		case (0x8086 << 16) | 0x2668:	/* Intel ICH6 (untested) */

 		case (0x8086 << 16) | 0x27d8:	/* Intel ICH7 */

@@ -1812,6 +1814,7 @@

 		case (0x15ad << 16) | 0x1977:	/* Vmware */

 			return p;

 		}

+	}

 	return nil;

 }

-- 

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