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

From: Jason Gunthorpe
Date: Mon Dec 18 2017 - 15:19:16 EST

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.