drm/amd/display: Implement voltage limitation for dali

[Why]
we only want the lowest voltage to be available for dali.

[How]
Use the get_highest_allowed_voltage_level function
to return 0 for dali
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c

@@ -708,6 +708,10 @@ static void hack_bounding_box(struct dcn_bw_internal_vars *v,
 
 unsigned int get_highest_allowed_voltage_level(uint32_t hw_internal_rev)
 {
+	/* for dali, the highest voltage level we want is 0 */
+	if (ASICREV_IS_DALI(hw_internal_rev))
+		return 0;
+
 	/* we are ok with all levels */
 	return 4;
 }