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WARN if the encoder possible_crtcs is effectively empty or contains
bits for non-existing crtcs.
v2: Move to drm_mode_config_validate() (Daniel)
Make the docs say we WARN when this is wrong (Daniel)
Extract full_crtc_mask()
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200211162208.16224-7-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>