drm/i915: Kconfig option to disable the legacy fbdev support

Boots Just Fine (tm)!

The only glitch seems to be that at least on Fedora the boot splash
gets confused and doesn't display much at all.

And since there's no ugly console flickering anymore in between, the
flicker while switching between X servers (VT support is still enabled)
is even more jarring.

Also, I'm unsure whether we don't need to somehow kick out vgacon, now
that nothing else gets in the way. But stuff seems to work, so I
don't care. Also everything still works as well with VGA_CONSOLE=n

Also the #ifdef mess needs a bit of a cleanup, follow-up patches will
do just that.

To keep the Kconfig tidy, extract all the i915 options into its own
file.

v2:
- Rebase on top of the preliminary hw support option and the
  intel_drv.h cleanup.
- Shut up warnings in i915_debugfs.c

v3: Use the right CONFIG variable, spotted by Chon Ming.

Cc: Lee, Chon Ming <chon.ming.lee@intel.com>
Cc: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Chon Ming Lee <chon.ming.lee@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 29 insertions, 7 deletions

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index b497a96af082..0f8402bc4222 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -713,14 +713,36 @@ bool intel_dsi_init(struct drm_device *dev);
 void intel_dvo_init(struct drm_device *dev);
 
 
-/* intel_fb.c */
-int intel_fbdev_init(struct drm_device *dev);
-void intel_fbdev_initial_config(struct drm_device *dev);
-void intel_fbdev_fini(struct drm_device *dev);
-void intel_fbdev_set_suspend(struct drm_device *dev, int state);
-void intel_fb_output_poll_changed(struct drm_device *dev);
-void intel_fb_restore_mode(struct drm_device *dev);
+/* legacy fbdev emulation in intel_fb.c */
+#ifdef CONFIG_DRM_I915_FBDEV
+extern int intel_fbdev_init(struct drm_device *dev);
+extern void intel_fbdev_initial_config(struct drm_device *dev);
+extern void intel_fbdev_fini(struct drm_device *dev);
+extern void intel_fbdev_set_suspend(struct drm_device *dev, int state);
+extern void intel_fb_output_poll_changed(struct drm_device *dev);
+extern void intel_fb_restore_mode(struct drm_device *dev);
+#else
+static inline int intel_fbdev_init(struct drm_device *dev)
+{
+	return 0;
+}
 
+static inline void intel_fbdev_initial_config(struct drm_device *dev)
+{
+}
+
+static inline void intel_fbdev_fini(struct drm_device *dev)
+{
+}
+
+static inline void intel_fbdev_set_suspend(struct drm_device *dev, int state)
+{
+}
+
+static inline void intel_fb_restore_mode(struct drm_device *dev)
+{
+}
+#endif
 
 /* intel_hdmi.c */
 void intel_hdmi_init(struct drm_device *dev, int hdmi_reg, enum port port);