mb/google/guybrush: Add PCIe Reset GPIO18 to PCIE WWAN DXIO Descriptor

WWAN_AUX_RST_L is asserted during S0i3 entry. But it needs to be
de-asserted before PCIe link training during S0i3 resume. Otherwise the
concerned gpp_bridge_2 PCIe device is not enumerated on Soi3 resume.
This change feeds in the WWAN_AUX_RST_L GPIO in the DXIO descriptor so
that SMU de-asserts this reset on S0i3 resume.

BUG=b:199780346
TEST=Build and boot to OS in Guybrush. Perform suspend/resume cycles for
500 iterations. Ensure that the PCIe devices enumerate fine.

Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Change-Id: I588c490bf3f8a7beffefc3bfd8ca5167fcbcb9a5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58459
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

0 files changed, 0 insertions, 0 deletions