linux-kernel - Re: [RFC 10/16] drm/nouveau/timer: skip calibration on GK20A

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Message-ID: <52F0A72B.8030900@nvidia.com>
Date:	Tue, 4 Feb 2014 17:39:07 +0900
From:	Alexandre Courbot <acourbot@...dia.com>
To:	Ben Skeggs <skeggsb@...il.com>
CC:	Ben Skeggs <bskeggs@...hat.com>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Eric Brower <ebrower@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Terje Bergstrom <tbergstrom@...dia.com>,
	Ken Adams <KAdams@...dia.com>
Subject: Re: [RFC 10/16] drm/nouveau/timer: skip calibration on GK20A

On 02/04/2014 12:55 PM, Ben Skeggs wrote:
> On Sat, Feb 1, 2014 at 1:16 PM, Alexandre Courbot <acourbot@...dia.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).
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