From: Viresh Kumar <viresh.kumar@linaro.org>
To: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: rjw@rjwysocki.net, linux-pm@vger.kernel.org
Subject: Re: [PATCH v5] cpufreq: acpi_cpufreq: base frequency attribute support
Date: Fri, 4 Mar 2016 10:54:14 +0530 [thread overview]
Message-ID: <20160304052414.GD2891@vireshk-i7> (raw)
In-Reply-To: <1457032157-11490-1-git-send-email-srinivas.pandruvada@linux.intel.com>
On 03-03-16, 11:09, Srinivas Pandruvada wrote:
> Currently scaling_available_frequencies displays list of available
> frequencies which can be used to set max/min or current scaling frequency.
>
> $ cat scaling_available_frequencies
> 2301000 2300000 2200000 2000000 1900000 1800000 1700000 1500000 1400000
> 1300000 1100000 1000000 900000 800000 600000 500000
>
> Here traditionally it is assumed that only 2301000 is a turbo frequency,
> which is purely opportunistic, anything else user can request and may
> get it.
>
> But because of configurable thermal design power implementation in several
> Intel CPUs, the opportunistic frequency start can be any frequency in this
> range. For example it can be 2300000 or any lower value.
> This change adds an optional new attribute called "base_frequency",
> which displays the max non-turbo frequency (base frequency). For example:
>
> $ cat base_frequency
> 2200000
>
> This will allow user to choose a certain frequency which is not
> opportunistic.
>
> To be fair, other than the concept, the code is essentially copied
> from responses from Rafael in mailing list.
>
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> ---
>
> v5
> - Rebased on the top of
> "cpufreq: acpi: Allow new dynamics attributes to be added to acpi_cpufreq_attr"
> - Remove loop for finding next empty slot in acpi_cpufreq_attr
> - Code change suggested by Rafael
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
--
viresh
prev parent reply other threads:[~2016-03-04 5:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-03 19:09 [PATCH v5] cpufreq: acpi_cpufreq: base frequency attribute support Srinivas Pandruvada
2016-03-04 5:24 ` Viresh Kumar [this message]
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