diff options
| author | Subrata Banik <subratabanik@google.com> | 2023-01-16 15:14:40 +0530 |
|---|---|---|
| committer | Subrata Banik <subratabanik@google.com> | 2023-01-18 11:51:37 +0000 |
| commit | ea0c91fdc9e8509ff9168df3ecb7d61525fb925f (patch) | |
| tree | d714a6c39be7644e43fb674d47d8174f636784aa /src/soc/intel/elkhartlake | |
| parent | ffa5ff84702684af7496ce8ad962e0f1c8b060cd (diff) | |
soc/intel/elkhartlake: Fix incorrect `prev_sleep_state` issue
The patch fixes indication of incorrect `prev_sleep_state` on the next
boot after global reset trigger. The existing code misses an important check about `if PCH doesn't set the WAK_STS` while checking power
failure. As a result, every early warm/global reset is considered
as power failure after looking into the PMC MMIO CON-A register
alone (as ignoring the ACPI PM_CTRL.WAK_STS bit).
As per the code comment this code logic is expected to check the power
failure reason if PCH doesn't set the WAK_STS while waking from G3
state.
Without this patch:
Observation: Resuming after a warm reset is considered as
`prev_sleep_state 5` although the SLP_TYP is zero and WAK_STS bit
is set.
pm1_sts: 8100 pm1_en: 0000 pm1_cnt: 00000000
GEN_PMCON: d1215238 00002200
....
prev_sleep_state 5
With this patch:
Observation: Resuming after a warm reset is considered as
`prev_sleep_state 0`. It matches with the SLP_TYP is zero and
WAK_STS bit is set.
pm1_sts: 8100 pm1_en: 0000 pm1_cnt: 00000000
GEN_PMCON: d1215238 00002200
....
prev_sleep_state 0
Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: Ib43d3402f94f47dc576fb99a6b2a7acf6f0af220
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71982
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/intel/elkhartlake')
| -rw-r--r-- | src/soc/intel/elkhartlake/pmutil.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/soc/intel/elkhartlake/pmutil.c b/src/soc/intel/elkhartlake/pmutil.c index 0cf4227cb6..4203beefcc 100644 --- a/src/soc/intel/elkhartlake/pmutil.c +++ b/src/soc/intel/elkhartlake/pmutil.c @@ -211,7 +211,7 @@ int soc_prev_sleep_state(const struct chipset_power_state *ps, int prev_sleep_st * S5 because the PCH does not set the WAK_STS bit when waking * from a true G3 state. */ - if (ps->gen_pmcon_a & (PWR_FLR | SUS_PWR_FLR)) + if (!(ps->pm1_sts & WAK_STS) && (ps->gen_pmcon_a & (PWR_FLR | SUS_PWR_FLR))) prev_sleep_state = ACPI_S5; /* |