diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 3dadfa2..cb49685 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -74,23 +74,13 @@
 {
 	struct drm_irq_busid *p = data;
 
-	if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE))
+	if (!dev->driver->bus->irq_by_busid)
 		return -EINVAL;
 
 	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
 		return -EINVAL;
 
-	if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
-	    (p->busnum & 0xff) != dev->pdev->bus->number ||
-	    p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
-		return -EINVAL;
-
-	p->irq = dev->pdev->irq;
-
-	DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
-		  p->irq);
-
-	return 0;
+	return dev->driver->bus->irq_by_busid(dev, p);
 }
 
 /*