[PATCH 0/2][SRU][B/OEM-B]Fix resume failure on some TPM chips

[Aaron Ma]

BugLink: https://bugs.launchpad.net/bugs/1836031

[Impact]
System will reboot when resume from S3 with some TPM chips installed.

[Fix]
stable patch is merged in 4.15 kernel:
888d867df441 (tpm: cmd_ready command can be issued only after granting
locality)
it needs a fix:
tpm: separate cmd_ready/go_idle from runtime_pm
these 2 patches fix the issue and enable tpm resume
after seprating cmd_ready/go_idle.

[Test]
Verified on hardware. resume from S3 about 30 times with positive
result.

[Regression Potential]
Medium, stable patches backported. Verified on hardware.
backported with minor adjustion.

These 2 patches are included in 4.18 and 5.0 kernel, only 4.15 needs
them.

Tomas Winkler (2):
  tpm: separate cmd_ready/go_idle from runtime_pm
  tpm: tpm_try_transmit() refactor error flow.

 drivers/char/tpm/tpm-interface.c |  58 ++++++++++++++----
 drivers/char/tpm/tpm.h           |  12 +++-
 drivers/char/tpm/tpm2-space.c    |  16 +++--
 drivers/char/tpm/tpm_crb.c       | 101 +++++++++----------------------
 include/linux/tpm.h              |   2 +
 5 files changed, 94 insertions(+), 95 deletions(-)

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2.20.1