tmp/tpm_crb: fix Intel PTT hw bug during idle state

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There is a HW bug in Skylake, and Broxton PCH Intel PTT device, where
most of the registers in the control area except START, REQUEST, CANCEL,
and LOC_CTRL lost retention when the device is in the idle state. Hence
we need to bring the device to ready state before accessing the other
registers. The fix brings device to ready state before trying to read
command and response buffer addresses in order to remap the for access.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinn@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinn@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

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Winkler, Tomas 2016-09-12 16:04:19 +03:00 • committed by Jarkko Sakkinen

parent ba5287b6ef

commit bc33c5df71

1 changed files with 39 additions and 8 deletions

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drivers/char/tpm/tpm_crb.c

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