drm/amd/display: Add a check for idle power optimization

[why]
Need a helper function to check idle power is allowed
so that dc doesn't access any registers that are power-gated.

[how]
Implement helper function to check idle power optimization.
Enable a hook to check if detection is allowed.

V2:
Add function hooks for set and get idle states.
Check if function hook was properly initialized.

Reviewed-by: Aric Cyr <[email protected]>
Reviewed-by: Nicholas Choi <[email protected]>
Acked-by: Roman Li <[email protected]>
Signed-off-by: Sung Joon Kim <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 342022b7ab37..eab9a0be3328 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -2315,6 +2315,7 @@ bool dc_is_plane_eligible_for_idle_optimizations(struct dc *dc, struct dc_plane_
 				struct dc_cursor_attributes *cursor_attr);
 
 void dc_allow_idle_optimizations(struct dc *dc, bool allow);
+bool dc_dmub_is_ips_idle_state(struct dc *dc);
 
 /* set min and max memory clock to lowest and highest DPM level, respectively */
 void dc_unlock_memory_clock_frequency(struct dc *dc);