diff options
| author | Furquan Shaikh <furquan@google.com> | 2019-07-06 22:09:28 -0700 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-07-07 07:51:24 +0000 |
| commit | a913b3df90da925246936cb421afe01901172211 (patch) | |
| tree | e31bcebc543bf13b61483c5cfbb9bce5ae11547b /src/soc/intel/cannonlake/finalize.c | |
| parent | db6c3f25f0d4b7fc0fd7aefb0b2442584a7f2c99 (diff) | |
soc/intel/cannonlake: Use SA_DEV_ROOT instead of PCH_DEV_PMC
PMC device gets hidden from PCI bus after FSP-S call. Thus, it gets
removed from the root bus as leftover unused device. With change
903b40a8a46 ("soc/intel: Replace uses of dev_find_slot()"), all uses
of dev_find_slot() were replaced by pcidev_path_on_root() which relies
on scanning of root bus to find the requested device. Since PMC device
is removed from the root bus, pcidev_path_on_root() returns NULL for
it thus resulting in configuration being skipped for the PMC
ultimately resulting in S3 failures.
Since the PCH_DEV_PMC was just used to get to chip config, this change
replaces the use of PCH_DEV_PMC with SA_DEV_ROOT.
BUG=b:136861224
TEST=Verified that S3 works fine on hatch.
Change-Id: Ie5ade00ac2aca697608f1bdea9764b71c26e2112
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34116
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Diffstat (limited to 'src/soc/intel/cannonlake/finalize.c')
| -rw-r--r-- | src/soc/intel/cannonlake/finalize.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/soc/intel/cannonlake/finalize.c b/src/soc/intel/cannonlake/finalize.c index 4dfd15bc4a..d099d7779a 100644 --- a/src/soc/intel/cannonlake/finalize.c +++ b/src/soc/intel/cannonlake/finalize.c @@ -68,8 +68,13 @@ static void pch_finalize(void) * * Disabling ACPI PM timer is necessary for XTAL OSC shutdown. * Disabling ACPI PM timer also switches off TCO + * + * SA_DEV_ROOT device is used here instead of PCH_DEV_PMC since it is + * just required to get to chip config. PCH_DEV_PMC is hidden by this + * point and hence removed from the root bus. pcidev_path_on_root thus + * returns NULL for PCH_DEV_PMC device. */ - dev = PCH_DEV_PMC; + dev = SA_DEV_ROOT; config = dev->chip_info; pmcbase = pmc_mmio_regs(); if (config->PmTimerDisabled) { |