drm/amdgpu: don't init fbdev if we don't have any connectors

Don't init fbdev if we don't have connectors.  E.g., if you have
a PX laptop with the displays attached to an IGP with no driver
support, you may end up with a blank screen rather than falling
back to vesa, etc.

Based on a similar radeon patch from Rob Clark.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
index cfb6caad2a73a4264ab9386f1c6616cf75ef0c77..919146780a15a91434f7383e666eedabdf402ca0 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
@@ -333,6 +333,10 @@ int amdgpu_fbdev_init(struct amdgpu_device *adev)
        if (!adev->mode_info.mode_config_initialized)
                return 0;
 
+       /* don't init fbdev if there are no connectors */
+       if (list_empty(&adev->ddev->mode_config.connector_list))
+               return 0;
+
        /* select 8 bpp console on low vram cards */
        if (adev->mc.real_vram_size <= (32*1024*1024))
                bpp_sel = 8;