tree e31bcebc543bf13b61483c5cfbb9bce5ae11547b
parent db6c3f25f0d4b7fc0fd7aefb0b2442584a7f2c99
author Furquan Shaikh <furquan@google.com> 1562476168 -0700
committer Patrick Georgi <pgeorgi@google.com> 1562485884 +0000

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>