[Bug 246707] ThinkPad T480 TPM 2.0 (STM7304) hangs on suspend

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246707

            Bug ID: 246707
           Summary: ThinkPad T480 TPM 2.0 (STM7304) hangs on suspend
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: jlduran at gmail.com

The TPM 2.0 device found in a ThinkPad T480 (STM7304) can be accessed by
adding its ACPI CID (MSFT0101) to tpm_acpi.c, and using security/tpm2-tools.

    # kldload tpm

    tpm0: <Trusted Platform Module> iomem 0xfed40000-0xfed44fff on acpi0
    tpm: device 0x0000104a rev 0x4e

    # tpm2_pcrread ...

However, this breaks suspend/resume, as noted by OpenBSD
(https://github.com/openbsd/src/commit/07392f17439228a8812f4b0b49ec6b4069679e41#diff-05e5ef1120d39f765ed58829b0d99848).

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