drm: provide a helper for the encoder possible_crtcs mask

The encoder possible_crtcs mask identifies which CRTCs can be bound to
a particular encoder.  Each bit from bit 0 defines an index in the list
of CRTCs held in the DRM mode_config crtc_list.  Rather than having
drivers trying to track the position of their CRTCs in the list, expose
the code which already exists for calculating the appropriate mask bit
for a CRTC.

Signed-off-by: Russell King <[email protected]>
Reviewed-by: David Herrmann <[email protected]>
Reviewed-by: Jani Nikula <[email protected]>
[[email protected]: add drm_crtc_index(), move to core]
Signed-off-by: Thierry Reding <[email protected]>

0 files changed, 0 insertions, 0 deletions