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

quoted

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