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Date:   Wed, 20 Dec 2017 12:35:34 +0100
From:   Javier Martinez Canillas <>
Cc:     James Ettle <>,
        Hans de Goede <>,
        Azhar Shaikh <>,
        Javier Martinez Canillas <>,
        Arnd Bergmann <>,
        Jarkko Sakkinen <>,
        Peter Huewe <>,
        Jason Gunthorpe <>,
        Greg Kroah-Hartman <>,
Subject: [PATCH 0/4] tpm: fix PS/2 devices not working on Braswell systems due CLKRUN enabled


Commit 5e572cab92f0 ("tpm: Enable CLKRUN protocol for Braswell systems")
added logic in the TPM TIS driver to disable the Low Pin Count CLKRUN
signal during TPM transactions.

Unfortunately this breaks other devices that are attached to the LPC bus
like for example PS/2 mouse and keyboards.

The bug was reported to the Fedora kernel [0] and the kernel bugzilla [1].
This issue and the propossed solution were discussed in this [2] thread,
and the reporter (Jame Ettle) confirmed that his system works again after
the fix in this series.

The patches are based on top or Jarkko Sakkinen's linux-tpmdd [3] tree.


Even when there shouldn't be any functional changes, I included some other
fixes / cleanups in this series so it would be great if you can test them
again. I can't because I don't have access to a machine affected by this.


Best regards,

Javier Martinez Canillas (4):
  tpm: fix access attempt to an already unmapped I/O memory region
  tpm: delete the TPM_TIS_CLK_ENABLE flag
  tpm: follow coding style for variable declaration in
  tpm: only attempt to disable the LPC CLKRUN if is already enabled

 drivers/char/tpm/tpm_tis.c      | 17 +----------------
 drivers/char/tpm/tpm_tis_core.c | 24 +++++++++++++++++-------
 drivers/char/tpm/tpm_tis_core.h |  1 -
 3 files changed, 18 insertions(+), 24 deletions(-)


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