[v3,2/2] usb: misc: xapea00x: perform platform initialization of TPM

["David R. Bild" <david.bild@xaptum.com>]

On Tue, May 8, 2018 at 5:47 AM, Jarkko Sakkinen
<jarkko.sakkinen@linux.intel.com> wrote:
>
> On Fri, May 04, 2018 at 08:00:22AM -0500, David R. Bild wrote:
> > Normally the system platform (i.e., BIOS/UEFI for x86) is responsible
> > for performing initialization of the TPM.  For these modules, the host
> > kernel is the platform, so we perform the initialization in the driver
> > before registering the TPM with the kernel TPM subsystem.
> >
> > The initialization consists of issuing the TPM startup command,
> > running the TPM self-test, and setting the TPM platform hierarchy
> > authorization to a random, unsaved value so that it can never be used
> > after the driver has loaded.
> >
> > Signed-off-by: David R. Bild <david.bild@xaptum.com>
>
> Have you checked what the TPM driver already does?


Yes.  It does the startup and self-test.

 However, this driver sets the platform hierarchy password *before*
giving the TPM to the TPM driver (thus, before the TPM driver can do
the startup and self-test).  Startup and self-test are prerequisites
for setting the platform hierarchy password, so this driver does those
itself too.

Best,
David
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