Re: [9front] audiohda add cannon lake

[kemal <kemalinanc8@gmail.com>]

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2023-07-27 6:11 GMT+03:00, Thaddeus Woskowiak <tswoskowiak@gmail.com>:
> I have a Lenovo ThinkCentre M720 Tiny with an Intel Core i5-8500T and
> B360 chipset. It has issues but this quick patch gets audio working:
> http://okturing.com/src/16483/body
>
> -taw
>

pci id assignment specification assigns the class 04:03 as HDA
https://pcisig.com/sites/default/files/files/PCI_Code-ID_r_1_11__v24_Jan_2019.pdf
checking the class id would allow the driver to attach any generic HDA device
i prepared a patch to do this, i kept the pci lookup table in case there is
some device with a broken pci class

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From: kemal <kemalinanc8@gmail.com>
Date: Thu, 27 Jul 2023 18:25:14 +0000
Subject: [PATCH] audiohda: detect hda devices using pci class id

---
diff 281c087865941281cbe656b5d7b44c15cfa68dfc 693b8be8be4be656b3108a2fc8eebb8fba94b1d2
--- 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;
 }