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[V2,0/2] char: tpm: Adjust cr50_i2c locking mechanism

Message ID 20241009094207.2897048-1-bernacki@google.com (mailing list archive)
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Series char: tpm: Adjust cr50_i2c locking mechanism | expand

Message

Grzegorz Bernacki Oct. 9, 2024, 9:42 a.m. UTC 
From: Grzegorz Bernacki <bernacki@chromium.org>

This patchset contains two patches from original patchset which have
not yet be merged. As per original description:

This patchset aims to add support for a platforms with cr50(tpm) i2c
chip shared across two CPUs. We need to provide a mechanism, which will
allow to synchronize accesses on a TPM-transaction boundaries.

These two patches are modifying cr50 to use generic callbacks for
locality management and then leverage this solution to apply i2c bus
locking on a TPM-operation level.

Changes from V1:
- add dev_err() and return instead of WARN_ONCE()
- correct returned value in tpm_cr50_i2c_probe() functions
- I did not address Tim's suggestion to return 0 instead of loc
in check and request locality, I would like to follow convention
from tpm_tis_core.c file 

Jan Dabros (2):
  char: tpm: cr50: Use generic request/relinquish locality ops
  char: tpm: cr50: Move i2c locking to request/relinquish locality ops

 drivers/char/tpm/tpm_tis_i2c_cr50.c | 132 ++++++++++++++++++----------
 1 file changed, 85 insertions(+), 47 deletions(-)