[coreboot-gerrit] Change in coreboot[master]: cr50 i2c: add error message reporting TPM IRQ timeout

[Vadim Bendebury (Code Review)]

Hello Mathew King, Philipp Deppenwiese, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/37255

to look at the new patch set (#2).

Change subject: cr50 i2c: add error message reporting TPM IRQ timeout
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cr50 i2c: add error message reporting TPM IRQ timeout

Various recent x86 SOCs have trouble registering short pulses
generated by the H1 to indicate that it is ready for the next
transaction.

This patch adds an error message to report this condition, which would
greatly reduce the amount of guesswork when troubleshooting new
platforms.

BUG=b:144002424

TEST=tried this code on the Drallion device exhibiting the problem,
     observed error messages in the coreboot log;

$ grep IRQ ap.log
  Cr50 i2c TPM IRQ timeout!
  Cr50 i2c TPM IRQ timeout!
  Cr50 i2c TPM IRQ timeout!
  Cr50 i2c TPM IRQ timeout!
  ...

Change-Id: I5f6ee3986bed58e12fd0ec8cecbf35f46c9263c2
---
M src/drivers/i2c/tpm/cr50.c
1 file changed, 3 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/55/37255/2