tree b70a296c9481bbf3bea9bb7fbd147009a7ecbe26
parent 7f63482cbf5f7be4cfb2a3af28577f198f8e058f
author Gabe Black <gabeblack@google.com> 1395884268 -0700
committer chrome-internal-fetch <chrome-internal-fetch@google.com> 1396066584 +0000

i2c: tpm: Write 0 to the TPM access register when probing the TPM.

Otherwise the TPM gets confused and doesn't work right at high frequencies.
This fix was found by Jimmy Zhang.

BUG=chrome-os-partner:27220
TEST=Built and booted on nyan with the TPM frequency turned up to 400KHz. Saw
that there weren't any TPM errors.
BRANCH=None

Change-Id: I16665c95940a1c3e36aabea64094f9079e415be5
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/191793
Reviewed-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Jimmy Zhang <jimmzhang@nvidia.com>
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>