drm/radeon: only init fbdev if we have connectors

This fixes an issue that was noticed on an optimus/prime laptop with
a kernel that was old enough to not support the integrated intel gfx
(which was driving all the outputs), but did have support for the
discrete radeon gpu.  The end result was not falling back to VESA and
leaving the user with a black screen.

(Plus it is kind of silly to create an framebuffer device if there
are no outputs hooked up to the gpu.)

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index b3bb92368ae0e98372e55caab123fb720ecdc48d..298ea1c453c3638fecdf6cef5afce1a48fdefa82 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -1670,8 +1670,10 @@ int radeon_modeset_init(struct radeon_device *rdev)
        /* setup afmt */
        radeon_afmt_init(rdev);
 
-       radeon_fbdev_init(rdev);
-       drm_kms_helper_poll_init(rdev->ddev);
+       if (!list_empty(&rdev->ddev->mode_config.connector_list)) {
+               radeon_fbdev_init(rdev);
+               drm_kms_helper_poll_init(rdev->ddev);
+       }
 
        /* do pm late init */
        ret = radeon_pm_late_init(rdev);