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

Jason Gunthorpe
2017-12-18T20:17:56Z

On Mon, Dec 18, 2017 at 08:29:30PM +0100, Javier Martinez Canillas wrote:

> My knowledge of LPC is near to non-existent so I please forgive me if I'm wrong,
> but my understanding is that it's the opposite of what you said.
>
> When CLKRUN_EN is SET, power management is ENABLED on the LPC bus and the host
> LCLK clock may be stopped when entering in some low-power states.
>
> The CLKRUN# signal is then used by peripherals to restart the LCLK clock after
> resuming from low-power states to be able to transmit again.
>
> When CLKRUN_EN is CLEAR, power management is DISABLED on the LPC bus and the
> host LCLK clock is never stopped even when entering in some low-power states.

Okay, that makes sense.

Jason