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

From: Javier Martinez Canillas
Date: Sat Dec 16 2017 - 16:00:14 EST

On 12/16/2017 06:01 PM, Jarkko Sakkinen wrote:
> On Fri, 2017-12-15 at 10:38 -0700, Jason Gunthorpe wrote:
>> On Fri, Dec 15, 2017 at 04:56:30PM +0200, Jarkko Sakkinen wrote:
>>> On Thu, Dec 14, 2017 at 12:10:52PM -0700, Jason Gunthorpe wrote:
>>>> On Thu, Dec 14, 2017 at 08:08:58PM +0100, Javier Martinez Canillas wrote:
>>>>> Although probably reverting the offending commits is the right thing to do
>>>>> until a proper solution is proposed.
>>>> Yes, if a fix is not forthcoming soon Jarkko should revert.
>>> I think I should drop the current patch going to 4.16 and revert the old
>>> patch. Do we agree on this?
>> I think the entire is_bsw thing needs to go, clearly manipulating
>> CLKRUN directly was not fully thought out?
>> Hopefully Intel will come up with a fix patch to preserve PS/2
>> functionality and it won't come to a revert..
> Agreed.

Agreed. Although it would be good to have a solution soon, because this has been
broken since v4.13 and v4.15-rc4 is likely to come this weekend. So we may end
with Braswell system being non-function for 3 kernel releases...

As mentioned I can write a patch to hide this behavior under a Kconfig option
that's disabled by default (and maybe depend on BROKEN) or a module parameter
until a proper solution is found.

> /Jarkko

Best regards,
Javier Martinez Canillas
Software Engineer - Desktop Hardware Enablement
Red Hat