diff options
| author | Furquan Shaikh <furquan@google.com> | 2018-10-05 11:04:01 -0700 |
|---|---|---|
| committer | Furquan Shaikh <furquan@google.com> | 2018-10-10 20:21:43 +0000 |
| commit | 99d258afcbb72c187c6aed6be3a0df6aac35722f (patch) | |
| tree | 448e5c0f7bc55309051f75729015504ec706f005 /src/soc | |
| parent | d5325ddcc27535e13a224cb62759933186de0d39 (diff) | |
| download | coreboot-99d258afcbb72c187c6aed6be3a0df6aac35722f.tar.xz | |
soc/intel/skylake: Set PCIEXPWAK_DIS if WAKE# pin is not enabled
This change sets PCIEXPWAK_DIS in PM1_EN register if WAKE# pin is not
enabled on the platform. This is required to prevent unnecessary wakes
if the WAKE# pin remains not connected on the platform. Function to
set PCIEXPWAK_DIS gets called in normal boot path (BS_PAYLOAD_LOAD) as
well as S3 resume path (BS_OS_RESUME).
BUG=b:117284700
TEST=Verified that no spurious wakes are observed on nocturne.
Change-Id: Iea93baffc9bb703c0ffedacafc6a9a9410c7ebfe
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/28939
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Diffstat (limited to 'src/soc')
| -rw-r--r-- | src/soc/intel/skylake/pmc.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/pmc.c b/src/soc/intel/skylake/pmc.c index a2623d953d..6b673bebd9 100644 --- a/src/soc/intel/skylake/pmc.c +++ b/src/soc/intel/skylake/pmc.c @@ -225,4 +225,29 @@ static void pm1_enable_pwrbtn_smi(void *unused) BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, pm1_enable_pwrbtn_smi, NULL); +/* + * Check if WAKE# pin is enabled based on DSX_EN_WAKE_PIN setting in + * deep_sx_config. If WAKE# pin is not enabled, then PCI Express Wake Disable + * bit needs to be set in PM1_EN to avoid unnecessary wakes caused by WAKE# + * pin. + */ +static void pm1_handle_wake_pin(void *unused) +{ + struct device *dev = SA_DEV_ROOT; + + if (!dev || !dev->chip_info) + return; + + const config_t *conf = dev->chip_info; + + /* If WAKE# pin is enabled, bail out early. */ + if (conf->deep_sx_config & DSX_EN_WAKE_PIN) + return; + + pmc_update_pm1_enable(PCIEXPWAK_DIS); +} + +BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, pm1_handle_wake_pin, NULL); +BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_EXIT, pm1_handle_wake_pin, NULL); + #endif |