drm/radeon/kms: be more pedantic about the g5 quirk (v2)

I don't think Apple offered any other cards for
this mac, so I doubt this will be an issue, but just
to be on the safe side, check the pci ids as well.

v2: fix spelling in commit message
Reviewed-by: NMichel Dänzer <michel@daenzer.net>
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Cc: Joachim Henke <j-o@users.sourceforge.net>
Cc: Michel Dänzer <michel@daenzer.net>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_combios.c

@@ -1553,9 +1553,12 @@ bool radeon_get_legacy_connector_info_from_table(struct drm_device *dev)
 			   (rdev->pdev->subsystem_device == 0x4a48)) {
 			/* Mac X800 */
 			rdev->mode_info.connector_table = CT_MAC_X800;
-		} else if (of_machine_is_compatible("PowerMac7,2") ||
-			   of_machine_is_compatible("PowerMac7,3")) {
-			/* Mac G5 9600 */
+		} else if ((of_machine_is_compatible("PowerMac7,2") ||
+			    of_machine_is_compatible("PowerMac7,3")) &&
+			   (rdev->pdev->device == 0x4150) &&
+			   (rdev->pdev->subsystem_vendor == 0x1002) &&
+			   (rdev->pdev->subsystem_device == 0x4150)) {
+			/* Mac G5 tower 9600 */
 			rdev->mode_info.connector_table = CT_MAC_G5_9600;
 		} else
 #endif /* CONFIG_PPC_PMAC */