linux-kernel - Re: [PATCH 0/3] Use Tegra's microsecond counter for udelay()

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Message-ID: <539F3CDA.407@wwwdotorg.org>
Date:	Mon, 16 Jun 2014 12:52:10 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
CC:	Russell King <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Thierry Reding <thierry.reding@...il.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH 0/3] Use Tegra's microsecond counter for udelay()

On 06/12/2014 09:58 AM, Peter De Schrijver wrote:
> This patchset introduces support for Tegra's microsecond counter as the
> udelay() timer. This is useful on Tegra SoCs which do not have an arch timer
> such as Tegra20 and Tegra30. Using the microsecond counter instead of a delay
> based loop avoids potential problems during cpu frequency changes.
> 
> The set consists of 3 patches:
> 
> Patch 1 introduces a new call which is used by the ARM architecture delay
> timer code to prevent changing the delay timer after calibration is finished
> and thus can be in use.
> 
> Patch 2 adds logic to choose the delay timer with the highest resolution. This
> allows the same registration code to be used on all Tegra SoCs and yet use the
> higher resolution arch timer when available (eg on Tegra114 or Tegra124).
> 
> Patch 3 adds the actual delay timer code.
> 
> Patch set has been verified on ventana (Tegra20), beaver (Tegra30),
> dalmore (Tegra114) and jetson TK1 (Tegra124).

I've applied this series to Tegra's for-3.17/delay-timer branch.
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