drm/radeon/kms: Fix irq handling on AVIVO hw

Avivo hw have vblank interrupt in different place, fixes
irq handling (especialy irq disabling while suspending or
shuting down the module).

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 8d9dd03..3598adc 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1064,6 +1064,8 @@
 
 /* rs600 */
 extern void rs600_set_safe_registers(struct radeon_device *rdev);
+extern int rs600_irq_set(struct radeon_device *rdev);
+extern void rs600_irq_disable(struct radeon_device *rdev);
 
 /* rs690, rs740 */
 extern void rs690_line_buffer_adjust(struct radeon_device *rdev,