From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932565AbaBEU1q (ORCPT ); Wed, 5 Feb 2014 15:27:46 -0500 Received: from avon.wwwdotorg.org ([70.85.31.133]:50664 "EHLO avon.wwwdotorg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754905AbaBEU1k (ORCPT ); Wed, 5 Feb 2014 15:27:40 -0500 Message-ID: <52F29EB8.5040906@wwwdotorg.org> Date: Wed, 05 Feb 2014 13:27:36 -0700 From: Stephen Warren User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Alexandre Courbot , Ben Skeggs CC: Ben Skeggs , "nouveau@lists.freedesktop.org" , "dri-devel@lists.freedesktop.org" , Alexandre Courbot , Eric Brower , "linux-kernel@vger.kernel.org" , "linux-tegra@vger.kernel.org" , Terje Bergstrom , Ken Adams Subject: Re: [RFC 10/16] drm/nouveau/timer: skip calibration on GK20A References: <1391224618-3794-1-git-send-email-acourbot@nvidia.com> <1391224618-3794-11-git-send-email-acourbot@nvidia.com> <52F0A72B.8030900@nvidia.com> In-Reply-To: <52F0A72B.8030900@nvidia.com> X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 >> 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.