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

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Message-ID: <52F29EB8.5040906@wwwdotorg.org>
Date:	Wed, 05 Feb 2014 13:27:36 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Alexandre Courbot <acourbot@...dia.com>,
	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>,
	"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 01:39 AM, Alexandre Courbot wrote:
> 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).

On the one Tegra124 board we support upstream, the crystal is 12MHz. I
believe this is a typical/common value; almost all the Tegra boards we
support upstream run at this rate.
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