drm/amd/display: define abm debug interface

[Why & How]
Define debug interface to dmub for reading back abm data.
Reviewed-by: Anthony Koo <anthony.koo@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Josip Pavic <josip.pavic@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h

@@ -3960,6 +3960,11 @@ enum dmub_cmd_abm_type {
 	 * Set ABM Events
 	 */
 	DMUB_CMD__ABM_SET_EVENT	= 9,
+
+	/**
+	 * Get the current ACE curve.
+	 */
+	DMUB_CMD__ABM_GET_ACE_CURVE = 10,
 };
 
 struct abm_ace_curve {
@@ -4488,6 +4493,55 @@ struct dmub_rb_cmd_abm_query_caps {
 	} data;
 };
 
+/**
+ * enum dmub_abm_ace_curve_type - ACE curve type.
+ */
+enum dmub_abm_ace_curve_type {
+	/**
+	 * ACE curve as defined by the SW layer.
+	 */
+	ABM_ACE_CURVE_TYPE__SW = 0,
+	/**
+	 * ACE curve as defined by the SW to HW translation interface layer.
+	 */
+	ABM_ACE_CURVE_TYPE__SW_IF = 1,
+};
+
+/**
+ * Definition of a DMUB_CMD__ABM_GET_ACE_CURVE command.
+ */
+struct dmub_rb_cmd_abm_get_ace_curve {
+	/**
+	 * Command header.
+	 */
+	struct dmub_cmd_header header;
+
+	/**
+	 * Address where ACE curve should be copied.
+	 */
+	union dmub_addr dest;
+
+	/**
+	 * Type of ACE curve being queried.
+	 */
+	enum dmub_abm_ace_curve_type ace_type;
+
+	/**
+	 * Indirect buffer length.
+	 */
+	uint16_t bytes;
+
+	/**
+	 * eDP panel instance.
+	 */
+	uint8_t panel_inst;
+
+	/**
+	 * Explicit padding to 4 byte boundary.
+	 */
+	uint8_t pad;
+};
+
 /**
  * Definition of a DMUB_CMD__ABM_SAVE_RESTORE command.
  */
@@ -4521,6 +4575,7 @@ struct dmub_rb_cmd_abm_save_restore {
 /**
  * Data passed from driver to FW in a DMUB_CMD__ABM_SET_EVENT command.
  */
+
 struct dmub_cmd_abm_set_event_data {
 
 	/**
@@ -5102,6 +5157,11 @@ union dmub_rb_cmd {
 	 */
 	struct dmub_rb_cmd_abm_query_caps abm_query_caps;
 
+	/**
+	 * Definition of a DMUB_CMD__ABM_GET_ACE_CURVE command.
+	 */
+	struct dmub_rb_cmd_abm_get_ace_curve abm_get_ace_curve;
+
 	/**
 	 * Definition of a DMUB_CMD__ABM_SET_EVENT command.
 	 */