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Date: Tue, 4 Feb 2014 17:39:07 +0900
From: Alexandre Courbot <acourbot@nvidia.com>
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To: Ben Skeggs <skeggsb@gmail.com>
CC: Ben Skeggs <bskeggs@redhat.com>,
        "nouveau@lists.freedesktop.org" <nouveau@lists.freedesktop.org>,
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        "linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
        Terje Bergstrom <tbergstrom@nvidia.com>, Ken Adams <KAdams@nvidia.com>
Subject: Re: [RFC 10/16] drm/nouveau/timer: skip calibration on GK20A
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On 02/04/2014 12:55 PM, Ben Skeggs wrote:
> On Sat, Feb 1, 2014 at 1:16 PM, Alexandre Courbot <acourbot@nvidia.com> wrote:
>> GK20A's timer is directly attached to the system timer and cannot be
>> calibrated. Skip the calibration phase on that chip since the
>> corresponding registers do not exist.
> Just a curiosity:  What timer resolution does the HW initialise at?

On T124 the timer input is the oscillator clock, which depending on the 
device can run between 12 and 48Mhz (IIUC).