From mboxrd@z Thu Jan  1 00:00:00 1970
From: Viresh Kumar <viresh.kumar@linaro.org>
Subject: Re: cpufreq and boost with amd ryzen
Date: Wed, 5 Jul 2017 09:47:58 +0530
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To: Sergio P <sergio.pieiga@gmail.com>, "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Linux PM list <linux-pm@vger.kernel.org>

+Rafael,

On 04-07-17, 16:38, Sergio P wrote:
> To be honest, I am not very familiar on how to debug the kernel.
> 
> My guess would be that X86_FEATURE_CPB is not being detected correctly
> for Ryzen family in the CPUID registers, and it returns early from
> acpi_cpufreq_boost_init().  Also, CPB was a feature in earlier AMD
> processors, but now in the new Ryzen family, I'm not sure if it's
> called something else and perhaps defined in a different CPUID bit.

@Rafael: Do you have any idea about the new Ryzen family or how to get boost
working on them ?

-- 
viresh