linux-kernel - Re: [PATCH v6 3/7] powercap/drivers/dtpm: Simplify the dtpm table

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Date:   Fri, 26 Nov 2021 18:40:26 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Doug Smythies <dsmythies@...us.net>
Cc:     Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        lukasz.luba@....com, "Rafael J. Wysocki" <rafael@...nel.org>,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v6 3/7] powercap/drivers/dtpm: Simplify the dtpm table

On 26/11/2021 18:08, Doug Smythies wrote:
> Hi Daniel,
> 
> This patch introduces a regression, at least on my test system.
> I can no longer change CPU frequency scaling drivers, for example
> from intel_cpufreq (A.K.A intel_pstate in passive mode) to intel_pstate
> (A.K.A. active mode). The task just hangs forever.
> 
> I bisected the kernel and got this commit as the result.
> As a double check, I reverted this commit:
> 7a89d7eacf8e84f2afb94db5ae9d9f9faa93f01c
> on kernel 5.16-rc2 and the issue was resolved.
> 
> While your email is fairly old, I observe that it was only included as of
> kernel 5.16-rc1.

Could it be related to and fixed by:

https://lore.kernel.org/all/20211108062345.273855-1-daniel.lezcano@linaro.org/

?

> Command Example that never completes:
> 
> $ echo passive | sudo tee /sys/devices/system/cpu/intel_pstate/status
> 
> syslog excerpt attached.
> 
> ... Doug



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