diff options
| -rw-r--r-- | src/ec/google/wilco/chip.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/ec/google/wilco/chip.c b/src/ec/google/wilco/chip.c index 70e612442c..b44cbd6c64 100644 --- a/src/ec/google/wilco/chip.c +++ b/src/ec/google/wilco/chip.c @@ -28,6 +28,11 @@ #include "chip.h" /* + * Setting minimum length of UCSI_ACPI will ensure this region is placed out of IMD Small. + * Having this region out of IMD Small will prevent any memory mapping conflicts. + */ +#define UCSI_MIN_ALLOC_REGION_LEN CBMEM_SM_ROOT_SIZE +/* * The UCSI fields are defined in the UCSI specification at * https://www.intel.com/content/www/us/en/io/universal-serial-bus/usb-type-c-ucsi-spec.html * https://www.intel.com/content/www/us/en/io/universal-serial-bus/bios-implementation-of-ucsi.html @@ -175,19 +180,22 @@ static void wilco_ec_fill_ssdt_generator(struct device *dev) { struct opregion opreg; void *region_ptr; + size_t ucsi_alloc_region_len; if (!dev->enabled) return; - region_ptr = cbmem_add(CBMEM_ID_ACPI_UCSI, ucsi_region_len); + ucsi_alloc_region_len = ucsi_region_len < UCSI_MIN_ALLOC_REGION_LEN ? + UCSI_MIN_ALLOC_REGION_LEN : ucsi_region_len; + region_ptr = cbmem_add(CBMEM_ID_ACPI_UCSI, ucsi_alloc_region_len); if (!region_ptr) return; - memset(region_ptr, 0, ucsi_region_len); + memset(region_ptr, 0, ucsi_alloc_region_len); opreg.name = "UCSM"; opreg.regionspace = SYSTEMMEMORY; opreg.regionoffset = (uintptr_t)region_ptr; - opreg.regionlen = ucsi_region_len; + opreg.regionlen = ucsi_alloc_region_len; acpigen_write_scope(acpi_device_path_join(dev, "UCSI")); acpigen_write_name("_CRS"); |