drm: Make the .mode_fixup() operations mode argument a const pointer

The passed mode must not be modified by the operation, make it const.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index a4664e0..9e6f76f 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1624,7 +1624,7 @@
 }
 
 static bool atombios_crtc_mode_fixup(struct drm_crtc *crtc,
-				     struct drm_display_mode *mode,
+				     const struct drm_display_mode *mode,
 				     struct drm_display_mode *adjusted_mode)
 {
 	if (!radeon_crtc_scaling_mode_fixup(crtc, mode, adjusted_mode))