New patch to review for coreboot: skylake: Check for power failure when WAK_STS is not set

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/13696

-gerrit

commit d883376489d1c8d5a11550021cb325cf5b7e3ce7
Author: Duncan Laurie 
Date:   Tue Feb 9 09:21:41 2016 -0800

skylake: Check for power failure when WAK_STS is not set

The PCH does not set PM1_STS[WAK_STS] bit when waking from a
    G3 state, which is triggered by hiberante now on chell when we
    do a PMIC shutdown.  This means the checks for S5 wake are not
    done and instead it is logged as a wake from S0.

BUG=chrome-os-partner:50076
    BRANCH=glados
    TEST=pass firmware_EventLog test on chell

Change-Id: I3ca05a4824df3401150a63d4b6555f759de40087
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: de6c9bac447edd06568193f990f1f4e278576783
    Original-Change-Id: I4472498468d620fe69f2b68710e818a4ad287382
    Original-Signed-off-by: Duncan Laurie 
    Original-Reviewed-on: https://chromium-review.googlesource.com/326888
    Original-Reviewed-by: Aaron Durbin 
---
 src/soc/intel/skylake/romstage/power_state.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/soc/intel/skylake/romstage/power_state.c b/src/soc/intel/skylake/romstage/power_state.c
index 1987534..85234b5 100644
--- a/src/soc/intel/skylake/romstage/power_state.c
+++ b/src/soc/intel/skylake/romstage/power_state.c
@@ -69,6 +69,14 @@ static uint32_t prev_sleep_state(struct chipset_power_state *ps)
    	}
    	/* Clear SLP_TYP. */
    	outl(ps->pm1_cnt & ~(SLP_TYP), ACPI_BASE_ADDRESS + PM1_CNT);
+	} else {
+		/*
+		 * Check for any power failure to determine if this a wake from
+		 * S5 because the PCH does not set the WAK_STS bit when waking
+		 * from a true G3 state.
+		 */
+		if (ps->gen_pmcon_b & (PWR_FLR | SUS_PWR_FLR))
+			prev_sleep_state = SLEEP_STATE_S5;
    }

/*