From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Colin Cross <ccross@google.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>,
linux-tegra@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, cpufreq@vger.kernel.org
Subject: Re: [PATCH 9/9] [ARM] tegra: Add cpufreq support
Date: Fri, 30 Jul 2010 21:20:10 +0100 [thread overview]
Message-ID: <20100730202010.GA22180@sirena.org.uk> (raw)
In-Reply-To: <AANLkTi=jvQtCZ8=rsWDuLNpPLvKh54PdWvLDFZefZWDD@mail.gmail.com>
On Fri, Jul 30, 2010 at 12:56:33PM -0700, Colin Cross wrote:
> On Fri, Jul 30, 2010 at 6:11 AM, Dominik Brodowski
> >> + ? ? ret = clk_set_rate_cansleep(cpu_clk, freqs.new * 1000);
> > "can sleep"? For how long?
> Adjusting the CPU clock may require changing the voltage through the
> regulator api, which locks a mutex, and eventually through I2C, which
> sleeps on I2C completion.
...although in some systems the I2C cost will be replaced with updating
a GPIO which is very much cheaper.
next prev parent reply other threads:[~2010-07-30 20:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1280449771-24043-1-git-send-email-ccross@google.com>
2010-07-30 0:29 ` [PATCH 9/9] [ARM] tegra: Add cpufreq support Colin Cross
2010-07-30 13:11 ` Dominik Brodowski
2010-07-30 19:56 ` Colin Cross
2010-07-30 20:20 ` Mark Brown [this message]
2010-07-30 20:33 ` Colin Cross
2010-07-30 21:14 ` Mark Brown
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