linux-kernel - Re: [BISECTED] tpm CLKRUN breaks PS/2 keyboard and touchpad on Braswell system

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Date:   Mon, 18 Dec 2017 13:19:02 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Shaikh, Azhar" <azhar.shaikh@...el.com>
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        James Ettle <james@...le.org.uk>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "james.l.morris@...cle.com" <james.l.morris@...cle.com>
Subject: Re: [BISECTED] tpm CLKRUN breaks PS/2 keyboard and touchpad on
 Braswell system

On Mon, Dec 18, 2017 at 07:34:29PM +0000, Shaikh, Azhar wrote:

> >IIUC, if CLKRUN_EN is enabled, then all the devices attached to the
> >LPC bus have to support the CLKRUN protocol. My guess is that on
> >some Braswell systems LPC power management is enabled but the TPM
> >device doesn't have CLKRUN support.
> 
> I think this is what might be happening here.

That makes it a BIOS bug, not a chipset bug, and we shouldn't be
trying to fix it like this in Linux.

Based on the original discussion I always thought this was an Intel
chipset bug and applies to all cases.

Jason