tpm/tpm_crb: cache cmd_size register value.
Instead of expensive register access on retrieving cmd_size on each send, save the value during initialization in the private context. The value doesn't change. Signed-off-by: NTomas Winkler <tomas.winkler@intel.com> Reviewed-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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