mb/google/zork: correct MST probes

It turns out that putting a device ref in an overridetree at a different
point in the tree will generate a duplicate device definition, such that
the change introducing this support was ignoring the device presence
specified by overridetree.cb and only using the baseboard configuration.
I believe testing of that change was not redone after the baseboard was
changed to disable the MST, so that conflicting behavior was not
noticed.

The incorrect behavior generated a disabled device for the MST at the
location specified by the baseboard, and one with the probe as a child
of the soc. At runtime this did a fw_config probe of the "I2C 00:4a"
device, and later probed a different "I2C 00:4a" which was already
disabled. As the disabled one came later, it seems to have completely
disabled the MST, discarding the results of the variant-specific probe.

BUG=b:185862297
TEST=10EC2141 device is now present on a Dali berknip
BRANCH=zork

Change-Id: I2a8feb544f3fc198fe6313b226ad8995aad31c3e
Signed-off-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57298
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions