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From: Jason Gunthorpe <jgg@ziepe.ca>
To: Javier Martinez Canillas <javierm@redhat.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	James Ettle <james@ettle.org.uk>,
	linux-integrity@vger.kernel.org, azhar.shaikh@intel.com,
	linux-kernel@vger.kernel.org, james.l.morris@oracle.com
Subject: Re: [BISECTED] tpm CLKRUN breaks PS/2 keyboard and touchpad on Braswell system
Date: Mon, 18 Dec 2017 13:17:50 -0700	[thread overview]
Message-ID: <20171218201750.GE19056@ziepe.ca> (raw)
In-Reply-To: <379b4165-bf82-70e9-4fc9-018fb62ee23c@redhat.com>

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

  parent reply	other threads:[~2017-12-18 20:18 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-11 19:37 [BISECTED] tpm CLKRUN breaks PS/2 keyboard and touchpad on Braswell system James Ettle
2017-12-12 11:38 ` Javier Martinez Canillas
2017-12-12 18:57   ` Jason Gunthorpe
2017-12-12 19:12     ` Javier Martinez Canillas
2017-12-12 21:17   ` James Ettle
2017-12-14 19:08     ` Javier Martinez Canillas
2017-12-14 19:10       ` Jason Gunthorpe
2017-12-15 14:56         ` Jarkko Sakkinen
2017-12-15 17:38           ` Jason Gunthorpe
2017-12-16 17:01             ` Jarkko Sakkinen
2017-12-16 20:59               ` Javier Martinez Canillas
2017-12-18 11:11                 ` Javier Martinez Canillas
2018-01-02 20:53                   ` Pavel Machek
2018-01-02 20:53                     ` Pavel Machek
2017-12-18 12:22               ` Javier Martinez Canillas
2017-12-18 12:22                 ` Javier Martinez Canillas
2017-12-18 12:29                 ` Javier Martinez Canillas
2017-12-18 12:29                   ` Javier Martinez Canillas
2017-12-18 17:55                   ` Jason Gunthorpe
2017-12-18 19:29                     ` Javier Martinez Canillas
2017-12-18 19:34                       ` Shaikh, Azhar
2017-12-18 20:04                         ` Shaikh, Azhar
2017-12-18 20:19                         ` Jason Gunthorpe
2017-12-18 23:34                           ` Javier Martinez Canillas
2017-12-19  2:08                             ` Jason Gunthorpe
2017-12-19 13:10                             ` Jarkko Sakkinen
2017-12-19 13:12                               ` Javier Martinez Canillas
2017-12-19 13:04                           ` Jarkko Sakkinen
2017-12-19 20:20                             ` Jason Gunthorpe
2017-12-18 23:06                         ` Javier Martinez Canillas
2017-12-18 20:17                       ` Jason Gunthorpe [this message]
2017-12-19 13:02                     ` Jarkko Sakkinen
2017-12-18 18:26                   ` James Ettle
2017-12-18 19:34                     ` Javier Martinez Canillas
2017-12-19 13:00                     ` Jarkko Sakkinen
2017-12-19 13:18                       ` James Ettle
2017-12-22 18:30                         ` Jarkko Sakkinen
2017-12-19 12:59                 ` Jarkko Sakkinen
2017-12-19 13:10                   ` Javier Martinez Canillas
2017-12-19 21:08                 ` [PATCH 1/1] tpm: only attempt to disable the LPC CLKRUN if is already kbuild test robot
2017-12-19 21:08                   ` kbuild test robot
2017-12-14 11:21 ` [BISECTED] tpm CLKRUN breaks PS/2 keyboard and touchpad on Braswell system Jarkko Sakkinen
2017-12-14 12:05   ` Javier Martinez Canillas

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