drm: split crtc/fb helpers into a separate module

I really don't want to have core drm module rely on CONFIG_FB,
so this is the easiest answer.

Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/Kconfig

@@ -18,6 +18,13 @@ menuconfig DRM
 	  details.  You should also select and configure AGP
 	  (/dev/agpgart) support.
 
+config DRM_MODE_HELPER
+	tristate
+	depends on DRM
+	select FB
+	help
+	  FB and CRTC helpers for kms drivers.
+
 config DRM_TTM
 	tristate
 	depends on DRM
@@ -48,7 +55,6 @@ config DRM_RADEON
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
-	select FB
 	select FRAMEBUFFER_CONSOLE if !EMBEDDED
 	select FW_LOADER
 	help
@@ -84,10 +90,10 @@ config DRM_I830
 config DRM_I915
 	tristate "i915 driver"
 	depends on AGP_INTEL
+	select DRM_MODE_HELPER
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
-	select FB
 	select FRAMEBUFFER_CONSOLE if !EMBEDDED
 	# i915 depends on ACPI_VIDEO when ACPI is enabled
 	# but for select to work, need to select ACPI_VIDEO's dependencies, ick

drivers/gpu/drm/Makefile

@@ -10,12 +10,15 @@ drm-y       :=	drm_auth.o drm_bufs.o drm_cache.o \
 		drm_lock.o drm_memory.o drm_proc.o drm_stub.o drm_vm.o \
 		drm_agpsupport.o drm_scatter.o ati_pcigart.o drm_pci.o \
 		drm_sysfs.o drm_hashtab.o drm_sman.o drm_mm.o \
-		drm_crtc.o drm_crtc_helper.o drm_modes.o drm_edid.o \
-		drm_info.o drm_debugfs.o drm_encoder_slave.o \
-		drm_fb_helper.o
+		drm_crtc.o drm_modes.o drm_edid.o \
+		drm_info.o drm_debugfs.o drm_encoder_slave.o
 
 drm-$(CONFIG_COMPAT) += drm_ioc32.o
 
+drm_helper-y := drm_fb_helper.o drm_crtc_helper.o
+
+obj-$(CONFIG_DRM_MODE_HELPER) += drm_helper.o
+
 obj-$(CONFIG_DRM)	+= drm.o
 obj-$(CONFIG_DRM_TTM)	+= ttm/
 obj-$(CONFIG_DRM_TDFX)	+= tdfx/

drivers/gpu/drm/drm_crtc.c

@@ -168,6 +168,7 @@ char *drm_get_encoder_name(struct drm_encoder *encoder)
 		 encoder->base.id);
 	return buf;
 }
+EXPORT_SYMBOL(drm_get_encoder_name);
 
 char *drm_get_connector_name(struct drm_connector *connector)
 {

drivers/gpu/drm/radeon/Kconfig

@@ -1,6 +1,7 @@
 config DRM_RADEON_KMS
 	bool "Enable modesetting on radeon by default"
 	depends on DRM_RADEON
+	select DRM_MODE_HELPER
 	select DRM_TTM
 	help
 	  Choose this option if you want kernel modesetting enabled by default,