diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index d1b95b7..797c8bc 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -1553,9 +1553,8 @@
 			   (rdev->pdev->subsystem_device == 0x4a48)) {
 			/* Mac X800 */
 			rdev->mode_info.connector_table = CT_MAC_X800;
-		} else if ((rdev->pdev->device == 0x4150) &&
-			   (rdev->pdev->subsystem_vendor == 0x1002) &&
-			   (rdev->pdev->subsystem_device == 0x4150)) {
+		} else if (of_machine_is_compatible("PowerMac7,2") ||
+			   of_machine_is_compatible("PowerMac7,3")) {
 			/* Mac G5 9600 */
 			rdev->mode_info.connector_table = CT_MAC_G5_9600;
 		} else