diff --git a/src/mainboard/apple/macbook21/mainboard.c b/src/mainboard/apple/macbook21/mainboard.c
index 9a025dd..a2adb76 100644
--- a/src/mainboard/apple/macbook21/mainboard.c
+++ b/src/mainboard/apple/macbook21/mainboard.c
@@ -40,6 +40,12 @@
extern const u32 *cim_verb_data;
extern u32 cim_verb_data_size;
+static acpi_cstate_t cst_entries[] = {
+ { 1, 1, 1000, { 0x7f, 1, 2, { 0 }, 1, 0 } },
+ { 2, 1, 500, { 0x01, 8, 0, { 0 }, DEFAULT_PMBASE + LV2, 0 } },
+ { 2, 17, 250, { 0x01, 8, 0, { 0 }, DEFAULT_PMBASE + LV3, 0 } },
+};
+
#if CONFIG_PCI_OPTION_ROM_RUN_YABEL || CONFIG_PCI_OPTION_ROM_RUN_REALMODE
static int int15_handler(void)
{
@@ -73,7 +79,8 @@ static int int15_handler(void)
int get_cst_entries(acpi_cstate_t **entries)
{
- return 0;
+ *entries = cst_entries;
+ return ARRAY_SIZE(cst_entries);
}
static void mainboard_init(device_t dev)