ACPI 5.0: Implement Connection() and AccessAs() changes

Support within the interpreter and operation region dispatch.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/exprep.c b/drivers/acpi/acpica/exprep.c
index cc95e2000406..18b75fed626e 100644
--- a/drivers/acpi/acpica/exprep.c
+++ b/drivers/acpi/acpica/exprep.c
@@ -47,6 +47,7 @@
 #include "acinterp.h"
 #include "amlcode.h"
 #include "acnamesp.h"
+#include "acdispat.h"
 
 #define _COMPONENT          ACPI_EXECUTER
 ACPI_MODULE_NAME("exprep")
@@ -455,6 +456,30 @@ acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info)
                 obj_desc->field.region_obj =
                     acpi_ns_get_attached_object(info->region_node);
 
+                /* Fields specific to generic_serial_bus fields */
+
+                obj_desc->field.access_length = info->access_length;
+
+                if (info->connection_node) {
+                        second_desc = info->connection_node->object;
+                        if (!(second_desc->common.flags & AOPOBJ_DATA_VALID)) {
+                                status =
+                                    acpi_ds_get_buffer_arguments(second_desc);
+                                if (ACPI_FAILURE(status)) {
+                                        acpi_ut_delete_object_desc(obj_desc);
+                                        return_ACPI_STATUS(status);
+                                }
+                        }
+
+                        obj_desc->field.resource_buffer =
+                            second_desc->buffer.pointer;
+                        obj_desc->field.resource_length =
+                            (u16)second_desc->buffer.length;
+                } else if (info->resource_buffer) {
+                        obj_desc->field.resource_buffer = info->resource_buffer;
+                        obj_desc->field.resource_length = info->resource_length;
+                }
+
                 /* Allow full data read from EC address space */
 
                 if ((obj_desc->field.region_obj->region.space_id ==