drm/amd/display: remove unused functions

[why]
It has been decided that opm state query support will be dropped.
Therefore link encryption enabled and save current encryption states
won't be used anymore and there are no foreseeable usages in the future.
We will remove these two interfaces for clean up.

Acked-by: Solomon Chiu <[e-mail]>
Signed-off-by: Wenjing Liu <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c

···
 		INIT_DELAYED_WORK(&hdcp_work[i].property_validate_dwork, event_property_validate);
 
 		hdcp_work[i].hdcp.config.psp.handle = &adev->psp;
-		if (dc->ctx->dce_version == DCN_VERSION_3_1) {
+		if (dc->ctx->dce_version == DCN_VERSION_3_1)
 			hdcp_work[i].hdcp.config.psp.caps.dtm_v3_supported = 1;
-			hdcp_work[i].hdcp.config.psp.caps.opm_state_query_supported = false;
-		}
 		hdcp_work[i].hdcp.config.ddc.handle = dc_get_link_at_index(dc, i);
 		hdcp_work[i].hdcp.config.ddc.funcs.write_i2c = lp_write_i2c;
 		hdcp_work[i].hdcp.config.ddc.funcs.read_i2c = lp_read_i2c;

drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c

···
 		goto out;
 	}
 
-	/* save current encryption states to restore after next authentication */
-	mod_hdcp_save_current_encryption_states(hdcp);
-
 	/* reset existing authentication status */
 	status = reset_authentication(hdcp, output);
 	if (status != MOD_HDCP_STATUS_SUCCESS)
···
 		status = MOD_HDCP_STATUS_SUCCESS;
 		goto out;
 	}
-
-	/* save current encryption states to restore after next authentication */
-	mod_hdcp_save_current_encryption_states(hdcp);
 
 	/* stop current authentication */
 	status = reset_authentication(hdcp, output);

drivers/gpu/drm/amd/display/modules/hdcp/hdcp.h

···
 		struct mod_hdcp *hdcp, struct mod_hdcp_display *display);
 enum mod_hdcp_status mod_hdcp_remove_display_from_topology(
 		struct mod_hdcp *hdcp, uint8_t index);
-bool mod_hdcp_is_link_encryption_enabled(struct mod_hdcp *hdcp);
-void mod_hdcp_save_current_encryption_states(struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp1_create_session(struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp1_destroy_session(struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp1_validate_rx(struct mod_hdcp *hdcp);

drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c

···
 	mod_hdcp_execute_and_set(mod_hdcp_hdcp1_link_maintenance,
 			&input->link_maintenance, &status,
 			hdcp, "link_maintenance");
-
-	if (status != MOD_HDCP_STATUS_SUCCESS)
-		mod_hdcp_save_current_encryption_states(hdcp);
 out:
 	return status;
 }
···
 		mod_hdcp_execute_and_set(check_no_reauthentication_request_dp,
 				&input->reauth_request_check, &status,
 				hdcp, "reauth_request_check");
-
-	if (status != MOD_HDCP_STATUS_SUCCESS)
-		mod_hdcp_save_current_encryption_states(hdcp);
 out:
 	return status;
 }

drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.c

···
 	}
 
 	process_rxstatus(hdcp, event_ctx, input, &status);
-
-	if (status != MOD_HDCP_STATUS_SUCCESS)
-		mod_hdcp_save_current_encryption_states(hdcp);
 out:
 	return status;
 }

drivers/gpu/drm/amd/display/modules/hdcp/hdcp_psp.c

···
 	in->process.msg3_desc.msg_size = 0;
 }
 
-static enum mod_hdcp_status mod_hdcp_remove_display_from_topology_v2(
+static enum mod_hdcp_status remove_display_from_topology_v2(
 		struct mod_hdcp *hdcp, uint8_t index)
 {
 	struct psp_context *psp = hdcp->config.psp.handle;
···
 	return status;
 }
 
-static enum mod_hdcp_status mod_hdcp_remove_display_from_topology_v3(
+static enum mod_hdcp_status remove_display_from_topology_v3(
 		struct mod_hdcp *hdcp, uint8_t index)
 {
 	struct psp_context *psp = hdcp->config.psp.handle;
···
 	psp_dtm_invoke(psp, dtm_cmd->cmd_id);
 
 	if (dtm_cmd->dtm_status != TA_DTM_STATUS__SUCCESS) {
-		status = mod_hdcp_remove_display_from_topology_v2(hdcp, index);
+		status = remove_display_from_topology_v2(hdcp, index);
 		if (status != MOD_HDCP_STATUS_SUCCESS)
 			display->state = MOD_HDCP_DISPLAY_INACTIVE;
 	} else {
···
 	return status;
 }
 
-enum mod_hdcp_status mod_hdcp_remove_display_from_topology(
-		struct mod_hdcp *hdcp, uint8_t index)
-{
-	enum mod_hdcp_status status = MOD_HDCP_STATUS_UPDATE_TOPOLOGY_FAILURE;
-
-	if (hdcp->config.psp.caps.dtm_v3_supported)
-		status = mod_hdcp_remove_display_from_topology_v3(hdcp, index);
-	else
-		status = mod_hdcp_remove_display_from_topology_v2(hdcp, index);
-
-	return status;
-}
-
-static enum mod_hdcp_status mod_hdcp_add_display_to_topology_v2(
+static enum mod_hdcp_status add_display_to_topology_v2(
 		struct mod_hdcp *hdcp, struct mod_hdcp_display *display)
 {
 	struct psp_context *psp = hdcp->config.psp.handle;
···
 	return status;
 }
 
-static enum mod_hdcp_status mod_hdcp_add_display_to_topology_v3(
+static enum mod_hdcp_status add_display_to_topology_v3(
 		struct mod_hdcp *hdcp, struct mod_hdcp_display *display)
 {
 	struct psp_context *psp = hdcp->config.psp.handle;
···
 	psp_dtm_invoke(psp, dtm_cmd->cmd_id);
 
 	if (dtm_cmd->dtm_status != TA_DTM_STATUS__SUCCESS) {
-		status = mod_hdcp_add_display_to_topology_v2(hdcp, display);
+		status = add_display_to_topology_v2(hdcp, display);
 		if (status != MOD_HDCP_STATUS_SUCCESS)
 			display->state = MOD_HDCP_DISPLAY_INACTIVE;
 	} else {
···
 	return status;
 }
 
+enum mod_hdcp_status mod_hdcp_remove_display_from_topology(
+		struct mod_hdcp *hdcp, uint8_t index)
+{
+	enum mod_hdcp_status status = MOD_HDCP_STATUS_UPDATE_TOPOLOGY_FAILURE;
+
+	if (hdcp->config.psp.caps.dtm_v3_supported)
+		status = remove_display_from_topology_v3(hdcp, index);
+	else
+		status = remove_display_from_topology_v2(hdcp, index);
+
+	return status;
+}
+
 enum mod_hdcp_status mod_hdcp_add_display_to_topology(struct mod_hdcp *hdcp,
 					       struct mod_hdcp_display *display)
 {
 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
 
 	if (hdcp->config.psp.caps.dtm_v3_supported)
-		status = mod_hdcp_add_display_to_topology_v3(hdcp, display);
+		status = add_display_to_topology_v3(hdcp, display);
 	else
-		status = mod_hdcp_add_display_to_topology_v2(hdcp, display);
+		status = add_display_to_topology_v2(hdcp, display);
 
 	return status;
 }
···
 
 	mutex_unlock(&psp->hdcp_context.mutex);
 	return status;
-}
-
-bool mod_hdcp_is_link_encryption_enabled(struct mod_hdcp *hdcp)
-{
-	/* unsupported */
-	return true;
-}
-
-void mod_hdcp_save_current_encryption_states(struct mod_hdcp *hdcp)
-{
-	/* unsupported */
 }

drivers/gpu/drm/amd/display/modules/inc/mod_hdcp.h

···
 
 struct mod_hdcp_psp_caps {
 	uint8_t dtm_v3_supported;
-	uint8_t opm_state_query_supported;
 };
 
 enum mod_hdcp_display_disable_option {