[AGPGART] intel_agp: fix device probe

This patch trys to fix device probe in two cases. First we should
correctly detect device if integrated graphics device is not enabled
or exists, like an add-in card is plugged. Second on some type of intel
GMCH, it might have multiple graphic chip models, like 945GME case, so
we should be sure the detect works through the whole table.

Signed-off-by: Wang Zhenyu <zhenyu.z.wang@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/char/agp/intel-agp.c

@@ -1810,68 +1810,69 @@ static int find_gmch(u16 device)
 static const struct intel_driver_description {
 	unsigned int chip_id;
 	unsigned int gmch_chip_id;
+	unsigned int multi_gmch_chip; /* if we have more gfx chip type on this HB. */
 	char *name;
 	const struct agp_bridge_driver *driver;
 	const struct agp_bridge_driver *gmch_driver;
 } intel_agp_chipsets[] = {
-	{ PCI_DEVICE_ID_INTEL_82443LX_0, 0, "440LX", &intel_generic_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82443BX_0, 0, "440BX", &intel_generic_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82443GX_0, 0, "440GX", &intel_generic_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82810_MC1, PCI_DEVICE_ID_INTEL_82810_IG1, "i810",
+	{ PCI_DEVICE_ID_INTEL_82443LX_0, 0, 0, "440LX", &intel_generic_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82443BX_0, 0, 0, "440BX", &intel_generic_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82443GX_0, 0, 0, "440GX", &intel_generic_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82810_MC1, PCI_DEVICE_ID_INTEL_82810_IG1, 0, "i810",
 		NULL, &intel_810_driver },
-	{ PCI_DEVICE_ID_INTEL_82810_MC3, PCI_DEVICE_ID_INTEL_82810_IG3, "i810",
+	{ PCI_DEVICE_ID_INTEL_82810_MC3, PCI_DEVICE_ID_INTEL_82810_IG3, 0, "i810",
 		NULL, &intel_810_driver },
-	{ PCI_DEVICE_ID_INTEL_82810E_MC, PCI_DEVICE_ID_INTEL_82810E_IG, "i810",
+	{ PCI_DEVICE_ID_INTEL_82810E_MC, PCI_DEVICE_ID_INTEL_82810E_IG, 0, "i810",
 		NULL, &intel_810_driver },
-	{ PCI_DEVICE_ID_INTEL_82815_MC, PCI_DEVICE_ID_INTEL_82815_CGC, "i815",
-		&intel_810_driver, &intel_815_driver },
-	{ PCI_DEVICE_ID_INTEL_82820_HB, 0, "i820", &intel_820_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82820_UP_HB, 0, "i820", &intel_820_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82830_HB, PCI_DEVICE_ID_INTEL_82830_CGC, "830M",
+	{ PCI_DEVICE_ID_INTEL_82815_MC, PCI_DEVICE_ID_INTEL_82815_CGC, 0, "i815",
+		&intel_815_driver, &intel_810_driver },
+	{ PCI_DEVICE_ID_INTEL_82820_HB, 0, 0, "i820", &intel_820_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82820_UP_HB, 0, 0, "i820", &intel_820_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82830_HB, PCI_DEVICE_ID_INTEL_82830_CGC, 0, "830M",
 		&intel_830mp_driver, &intel_830_driver },
-	{ PCI_DEVICE_ID_INTEL_82840_HB, 0, "i840", &intel_840_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82845_HB, 0, "845G", &intel_845_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82845G_HB, PCI_DEVICE_ID_INTEL_82845G_IG, "830M",
+	{ PCI_DEVICE_ID_INTEL_82840_HB, 0, 0, "i840", &intel_840_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82845_HB, 0, 0, "845G", &intel_845_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82845G_HB, PCI_DEVICE_ID_INTEL_82845G_IG, 0, "830M",
 		&intel_845_driver, &intel_830_driver },
-	{ PCI_DEVICE_ID_INTEL_82850_HB, 0, "i850", &intel_850_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82855PM_HB, 0, "855PM", &intel_845_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82855GM_HB, PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM",
+	{ PCI_DEVICE_ID_INTEL_82850_HB, 0, 0, "i850", &intel_850_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82855PM_HB, 0, 0, "855PM", &intel_845_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82855GM_HB, PCI_DEVICE_ID_INTEL_82855GM_IG, 0, "855GM",
 		&intel_845_driver, &intel_830_driver },
-	{ PCI_DEVICE_ID_INTEL_82860_HB, 0, "i860", &intel_860_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82865_HB, PCI_DEVICE_ID_INTEL_82865_IG, "865",
+	{ PCI_DEVICE_ID_INTEL_82860_HB, 0, 0, "i860", &intel_860_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82865_HB, PCI_DEVICE_ID_INTEL_82865_IG, 0, "865",
 		&intel_845_driver, &intel_830_driver },
-	{ PCI_DEVICE_ID_INTEL_82875_HB, 0, "i875", &intel_845_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_82915G_HB, PCI_DEVICE_ID_INTEL_82915G_IG, "915G",
+	{ PCI_DEVICE_ID_INTEL_82875_HB, 0, 0, "i875", &intel_845_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_82915G_HB, PCI_DEVICE_ID_INTEL_82915G_IG, 0, "915G",
 		&intel_845_driver, &intel_915_driver },
-	{ PCI_DEVICE_ID_INTEL_82915GM_HB, PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM",
+	{ PCI_DEVICE_ID_INTEL_82915GM_HB, PCI_DEVICE_ID_INTEL_82915GM_IG, 0, "915GM",
 		&intel_845_driver, &intel_915_driver },
-	{ PCI_DEVICE_ID_INTEL_82945G_HB, PCI_DEVICE_ID_INTEL_82945G_IG, "945G",
+	{ PCI_DEVICE_ID_INTEL_82945G_HB, PCI_DEVICE_ID_INTEL_82945G_IG, 0, "945G",
 		&intel_845_driver, &intel_915_driver },
-	{ PCI_DEVICE_ID_INTEL_82945GM_HB, PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM",
+	{ PCI_DEVICE_ID_INTEL_82945GM_HB, PCI_DEVICE_ID_INTEL_82945GM_IG, 1, "945GM",
 		&intel_845_driver, &intel_915_driver },
-	{ PCI_DEVICE_ID_INTEL_82945GM_HB, PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME",
+	{ PCI_DEVICE_ID_INTEL_82945GM_HB, PCI_DEVICE_ID_INTEL_82945GME_IG, 0, "945GME",
 		&intel_845_driver, &intel_915_driver },
-	{ PCI_DEVICE_ID_INTEL_82946GZ_HB, PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ",
+	{ PCI_DEVICE_ID_INTEL_82946GZ_HB, PCI_DEVICE_ID_INTEL_82946GZ_IG, 0, "946GZ",
 		&intel_845_driver, &intel_i965_driver },
-	{ PCI_DEVICE_ID_INTEL_82965G_1_HB, PCI_DEVICE_ID_INTEL_82965G_1_IG, "965G",
+	{ PCI_DEVICE_ID_INTEL_82965G_1_HB, PCI_DEVICE_ID_INTEL_82965G_1_IG, 0, "965G",
 		&intel_845_driver, &intel_i965_driver },
-	{ PCI_DEVICE_ID_INTEL_82965Q_HB, PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q",
+	{ PCI_DEVICE_ID_INTEL_82965Q_HB, PCI_DEVICE_ID_INTEL_82965Q_IG, 0, "965Q",
 		&intel_845_driver, &intel_i965_driver },
-	{ PCI_DEVICE_ID_INTEL_82965G_HB, PCI_DEVICE_ID_INTEL_82965G_IG, "965G",
+	{ PCI_DEVICE_ID_INTEL_82965G_HB, PCI_DEVICE_ID_INTEL_82965G_IG, 0, "965G",
 		&intel_845_driver, &intel_i965_driver },
-	{ PCI_DEVICE_ID_INTEL_82965GM_HB, PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM",
+	{ PCI_DEVICE_ID_INTEL_82965GM_HB, PCI_DEVICE_ID_INTEL_82965GM_IG, 1, "965GM",
 		&intel_845_driver, &intel_i965_driver },
-	{ PCI_DEVICE_ID_INTEL_82965GM_HB, PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE",
+	{ PCI_DEVICE_ID_INTEL_82965GM_HB, PCI_DEVICE_ID_INTEL_82965GME_IG, 0, "965GME/GLE",
 		&intel_845_driver, &intel_i965_driver },
-	{ PCI_DEVICE_ID_INTEL_7505_0, 0, "E7505", &intel_7505_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_7205_0, 0, "E7205", &intel_7505_driver, NULL },
-	{ PCI_DEVICE_ID_INTEL_G33_HB, PCI_DEVICE_ID_INTEL_G33_IG, "G33",
+	{ PCI_DEVICE_ID_INTEL_7505_0, 0, 0, "E7505", &intel_7505_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_7205_0, 0, 0, "E7205", &intel_7505_driver, NULL },
+	{ PCI_DEVICE_ID_INTEL_G33_HB, PCI_DEVICE_ID_INTEL_G33_IG, 0, "G33",
 		&intel_845_driver, &intel_g33_driver },
-	{ PCI_DEVICE_ID_INTEL_Q35_HB, PCI_DEVICE_ID_INTEL_Q35_IG, "Q35",
+	{ PCI_DEVICE_ID_INTEL_Q35_HB, PCI_DEVICE_ID_INTEL_Q35_IG, 0, "Q35",
 		&intel_845_driver, &intel_g33_driver },
-	{ PCI_DEVICE_ID_INTEL_Q33_HB, PCI_DEVICE_ID_INTEL_Q33_IG, "Q33",
+	{ PCI_DEVICE_ID_INTEL_Q33_HB, PCI_DEVICE_ID_INTEL_Q33_IG, 0, "Q33",
 		&intel_845_driver, &intel_g33_driver },
-	{ 0, 0, NULL, NULL, NULL }
+	{ 0, 0, 0, NULL, NULL, NULL }
 };
 
 static int __devinit agp_intel_probe(struct pci_dev *pdev,
@@ -1892,10 +1893,19 @@ static int __devinit agp_intel_probe(struct pci_dev *pdev,
 		/* In case that multiple models of gfx chip may
 		   stand on same host bridge type, this can be
 		   sure we detect the right IGD. */
-		if ((pdev->device == intel_agp_chipsets[i].chip_id) &&
-			((intel_agp_chipsets[i].gmch_chip_id == 0) ||
-				find_gmch(intel_agp_chipsets[i].gmch_chip_id)))
-			break;
+		if (pdev->device == intel_agp_chipsets[i].chip_id) {
+			if ((intel_agp_chipsets[i].gmch_chip_id != 0) &&
+				find_gmch(intel_agp_chipsets[i].gmch_chip_id)) {
+				bridge->driver =
+					intel_agp_chipsets[i].gmch_driver;
+				break;
+			} else if (intel_agp_chipsets[i].multi_gmch_chip) {
+				continue;
+			} else {
+				bridge->driver = intel_agp_chipsets[i].driver;
+				break;
+			}
+		}
 	}
 
 	if (intel_agp_chipsets[i].name == NULL) {
@@ -1906,11 +1916,6 @@ static int __devinit agp_intel_probe(struct pci_dev *pdev,
 		return -ENODEV;
 	}
 
-	if (intel_agp_chipsets[i].gmch_chip_id != 0)
-	    bridge->driver = intel_agp_chipsets[i].gmch_driver;
-	else
-	    bridge->driver = intel_agp_chipsets[i].driver;
-
 	if (bridge->driver == NULL) {
 		printk(KERN_WARNING PFX "Failed to find bridge device "
 			"(chip_id: %04x)\n", intel_agp_chipsets[i].gmch_chip_id);