drm/radeon/kms: check modes against max pixel clock

Filter out modes that are higher than the max pixel
clock.

Signed-off-by: Alex Deucher <alexdeucher@gmail.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 ba643b5..27f4557 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -165,6 +165,7 @@
 	uint32_t default_sclk;
 	uint32_t default_dispclk;
 	uint32_t dp_extclk;
+	uint32_t max_pixel_clock;
 };
 
 /*