--- drivers/acpi/acpica/exprep.c

+++ drivers/acpi/acpica/exprep.c

@@ -468,6 +468,23 @@ acpi_status acpi_ex_prep_field_value(str

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,