drm/imx: Remove local fbdev emulation Kconfig option

DRM_IMX_FB_HELPER config is currently used to enable/disable fbdev
emulation for the imx kms driver.

Remove this local config option and use the top level DRM_FBDEV_EMULATION
config option where applicable. Using this config lets us also prevent
wrapping around drm_fb_helper_* calls with #ifdefs in certain places.

Tested-by: Philipp Zabel <[e-mail]>
Signed-off-by: Archit Taneja <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/imx/Kconfig

···
 	help
 	  enable i.MX graphics support
 
-config DRM_IMX_FB_HELPER
-	tristate "provide legacy framebuffer /dev/fb0"
-	select DRM_KMS_CMA_HELPER
-	depends on DRM_IMX
-	help
-	  The DRM framework can provide a legacy /dev/fb0 framebuffer
-	  for your device. This is necessary to get a framebuffer console
-	  and also for applications using the legacy framebuffer API
-
 config DRM_IMX_PARALLEL_DISPLAY
 	tristate "Support for parallel displays"
 	select DRM_PANEL

drivers/gpu/drm/imx/imx-drm-core.c

···
 	struct imx_drm_crtc_helper_funcs	imx_drm_helper_funcs;
 };
 
+#if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 static int legacyfb_depth = 16;
 module_param(legacyfb_depth, int, 0444);
+#endif
 
 int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
 {
···
 
 static void imx_drm_driver_lastclose(struct drm_device *drm)
 {
-#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 	struct imx_drm_device *imxdrm = drm->dev_private;
 
 	if (imxdrm->fbhelper)
 		drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
-#endif
 }
 
 static int imx_drm_driver_unload(struct drm_device *drm)
 {
-#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 	struct imx_drm_device *imxdrm = drm->dev_private;
-#endif
 
 	drm_kms_helper_poll_fini(drm);
 
-#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 	if (imxdrm->fbhelper)
 		drm_fbdev_cma_fini(imxdrm->fbhelper);
-#endif
 
 	component_unbind_all(drm->dev, drm);
 
···
 
 static void imx_drm_output_poll_changed(struct drm_device *drm)
 {
-#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 	struct imx_drm_device *imxdrm = drm->dev_private;
 
 	drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
-#endif
 }
 
 static struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
···
 	 * The fb helper takes copies of key hardware information, so the
 	 * crtcs/connectors/encoders must not change after this point.
 	 */
-#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
+#if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 	if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 		dev_warn(drm->dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 		legacyfb_depth = 16;