1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/exprep.c b/drivers/acpi/acpica/exprep.c
index edf62bf5b266..2fbfe51fb141 100644
--- a/drivers/acpi/acpica/exprep.c
+++ b/drivers/acpi/acpica/exprep.c
@@ -468,6 +468,23 @@ acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info)
 
                 acpi_ut_add_reference(obj_desc->field.region_obj);
 
+                /* allow full data read from EC address space */
+                if (obj_desc->field.region_obj->region.space_id ==
+                        ACPI_ADR_SPACE_EC) {
+                        if (obj_desc->common_field.bit_length > 8) {
+                                unsigned width =
+                                        ACPI_ROUND_BITS_UP_TO_BYTES(
+                                        obj_desc->common_field.bit_length);
+                                // access_bit_width is u8, don't overflow it
+                                if (width > 8)
+                                        width = 8;
+                                obj_desc->common_field.access_byte_width =
+                                                        width;
+                                obj_desc->common_field.access_bit_width =
+                                                        8 * width;
+                        }
+                }
+
                 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
                                   "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
                                   obj_desc->field.start_field_bit_offset,