drm/radeon: Only build fbdev if DRM_FBDEV_EMULATION is set

Make building fbdev emulation depend on DRM_FBDEV_EMULATION. Also
rename the source file to radeon_fbdev.c to align with other fbdev
files.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/Makefile

@@ -36,7 +36,7 @@ radeon-y += radeon_device.o radeon_asic.o radeon_kms.o \
 	atom.o radeon_fence.o radeon_ttm.o radeon_object.o radeon_gart.o \
 	radeon_legacy_crtc.o radeon_legacy_encoders.o radeon_connectors.o \
 	radeon_encoders.o radeon_display.o radeon_cursor.o radeon_i2c.o \
-	radeon_clocks.o radeon_fb.o radeon_gem.o radeon_ring.o radeon_irq_kms.o \
+	radeon_clocks.o radeon_gem.o radeon_ring.o radeon_irq_kms.o \
 	radeon_cs.o radeon_bios.o radeon_benchmark.o r100.o r300.o r420.o \
 	rs400.o rs600.o rs690.o rv515.o r520.o r600.o rv770.o radeon_test.o \
 	r200.o radeon_legacy_tv.o r600_cs.o \
@@ -76,6 +76,7 @@ radeon-y += \
 	vce_v1_0.o \
 	vce_v2_0.o
 
+radeon-$(CONFIG_DRM_FBDEV_EMULATION) += radeon_fbdev.o
 radeon-$(CONFIG_VGA_SWITCHEROO) += radeon_atpx_handler.o
 radeon-$(CONFIG_ACPI) += radeon_acpi.o
 

drivers/gpu/drm/radeon/radeon_mode.h

@@ -939,9 +939,20 @@ void dce4_program_fmt(struct drm_encoder *encoder);
 void dce8_program_fmt(struct drm_encoder *encoder);
 
 /* fbdev layer */
+#if defined(CONFIG_DRM_FBDEV_EMULATION)
 void radeon_fbdev_setup(struct radeon_device *rdev);
 void radeon_fbdev_set_suspend(struct radeon_device *rdev, int state);
 bool radeon_fbdev_robj_is_fb(struct radeon_device *rdev, struct radeon_bo *robj);
+#else
+static inline void radeon_fbdev_setup(struct radeon_device *rdev)
+{ }
+static inline void radeon_fbdev_set_suspend(struct radeon_device *rdev, int state)
+{ }
+static inline bool radeon_fbdev_robj_is_fb(struct radeon_device *rdev, struct radeon_bo *robj)
+{
+	return false;
+}
+#endif
 
 void radeon_crtc_handle_vblank(struct radeon_device *rdev, int crtc_id);