Without this, we get link errors during randconfig build:

drivers/gpu/drm/vkms/vkms_drv.o:(.rodata+0xa0): undefined reference to 
`drm_atomic_helper_check'
drivers/gpu/drm/vkms/vkms_drv.o:(.rodata+0xa8): undefined reference to 
`drm_atomic_helper_commit'
drivers/gpu/drm/vkms/vkms_plane.o:(.rodata+0x0): undefined reference to 
`drm_atomic_helper_update_plane'
drivers/gpu/drm/vkms/vkms_plane.o:(.rodata+0x8): undefined reference to 
`drm_atomic_helper_disable_plane'
drivers/gpu/drm/vkms/vkms_plane.o:(.rodata+0x18): undefined reference to 
`drm_atomic_helper_plane_reset'
drivers/gpu/drm/vkms/vkms_plane.o:(.rodata+0x28): undefined reference to 
`drm_atomic_helper_plane_duplicate_state'
drivers/gpu/drm/vkms/vkms_plane.o:(.rodata+0x30): undefined reference to 
`drm_atomic_helper_plane_destroy_state'
drivers/gpu/drm/vkms/vkms_output.o:(.rodata+0x1c0): undefined reference to 
`drm_helper_probe_single_connector_modes'
drivers/gpu/drm/vkms/vkms_crtc.o:(.rodata+0x40): undefined reference to 
`drm_atomic_helper_crtc_reset'
drivers/gpu/drm/vkms/vkms_crtc.o:(.rodata+0x70): undefined reference to 
`drm_atomic_helper_set_config'
drivers/gpu/drm/vkms/vkms_crtc.o:(.rodata+0x78): undefined reference to 
`drm_atomic_helper_page_flip'
drivers/gpu/drm/vkms/vkms_crtc.o:(.rodata+0x90): undefined reference to 
`drm_atomic_helper_crtc_duplicate_state'
drivers/gpu/drm/vkms/vkms_crtc.o:(.rodata+0x98): undefined reference to 
`drm_atomic_helper_crtc_destroy_state'

Fixes: 854502fa0a38 ("drm/vkms: Add basic CRTC initialization")
Fixes: 1c7c5fd916a0 ("drm/vkms: Introduce basic VKMS driver")
Signed-off-by: Arnd Bergmann <[email protected]>
---
 drivers/gpu/drm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 516a8f5d1ac6..e527772f5ca6 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -214,6 +214,7 @@ config DRM_VGEM
 config DRM_VKMS
        tristate "Virtual KMS (EXPERIMENTAL)"
        depends on DRM
+       select DRM_KMS_HELPER
        default n
        help
          Virtual Kernel Mode-Setting (VKMS) is used for testing or for
-- 
2.9.0

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