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authorHaridhar Kalvala <haridhar.kalvala@intel.com>2018-06-07 10:52:31 +0530
committerFurquan Shaikh <furquan@google.com>2018-06-08 23:37:19 +0000
commit1cedc7e40f31a0874ed59a58efe95c215317c255 (patch)
tree4ef6ace0ee1ce0414c1f2048c68b658635214e49 /src/soc/intel
parent4ca3a8abfa6456142520f3d53241167730b5fadc (diff)
downloadcoreboot-1cedc7e40f31a0874ed59a58efe95c215317c255.tar.xz
soc/intel/skylake: Enable low power S0Idle capability
This patch sets the ACPI FADT flag ACPI_FADT_LOW_POWER_S0 if S0ix is enabled for the platform. BUG=b:79559085 TEST= Boot to OS and check the ACPI_FADT_LOW_PWR_IDLE_S0 flag is set in FACP table - FADT.Flags[21] bit. Change-Id: I0b8a86118232a66e7466d5b8116eff6087b51210 Signed-off-by: Haridhar Kalvala <haridhar.kalvala@intel.com> Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com> Reviewed-on: https://review.coreboot.org/26940 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Naresh Solanki <naresh.solanki@intel.com>
Diffstat (limited to 'src/soc/intel')
-rw-r--r--src/soc/intel/skylake/acpi.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/acpi.c b/src/soc/intel/skylake/acpi.c
index be1200b681..cc8f43725b 100644
--- a/src/soc/intel/skylake/acpi.c
+++ b/src/soc/intel/skylake/acpi.c
@@ -234,6 +234,8 @@ unsigned long acpi_fill_madt(unsigned long current)
void acpi_fill_fadt(acpi_fadt_t *fadt)
{
+ const struct device *dev = SA_DEV_ROOT;
+ const config_t *config = dev ? dev->chip_info : NULL;
const uint16_t pmbase = ACPI_BASE_ADDRESS;
/* Use ACPI 3.0 revision */
@@ -282,6 +284,9 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
ACPI_FADT_RESET_REGISTER | ACPI_FADT_SEALED_CASE |
ACPI_FADT_S4_RTC_WAKE | ACPI_FADT_PLATFORM_CLOCK;
+ if (config && config->s0ix_enable)
+ fadt->flags |= ACPI_FADT_LOW_PWR_IDLE_S0;
+
fadt->reset_reg.space_id = 1;
fadt->reset_reg.bit_width = 8;
fadt->reset_reg.bit_offset = 0;