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The vendor check introduced by commit 554b841d4703 ("tpm: Disable RNG for
all AMD fTPMs") doesn't work properly on a number of Intel fTPMs. On the
reported systems the TPM doesn't reply at bootup and returns back the
command code. This makes the TPM fail probe on Lenovo Legion Y540 laptop.
Since only Microsoft Pluton is the only known combination of AMD CPU and
fTPM from other vendor, disable hwrng otherwise. In order to make sysadmin
aware of this, print also info message to the klog.
Cc: stable@vger.kernel.org
Fixes: 554b841d4703 ("tpm: Disable RNG for all AMD fTPMs")
Reported-by: Todd Brandt <todd.e.brandt@intel.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217804
Reported-by: Patrick Steinhardt <ps@pks.im>
Reported-by: Raymond Jay Golo <rjgolo@gmail.com>
Reported-by: Ronan Pigott <ronan@rjp.ie>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
8f7f35e5aa