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Message-ID: <aa643910265b9d92a397d5148b31d37b2c421b8b.camel@xry111.site>
Subject: Re: [PATCH v1 2/6] cpufreq: intel_pstate: Do not update
 global.turbo_disabled after initialization
From: Xi Ruoyao <xry111@xry111.site>
To: srinivas pandruvada <srinivas.pandruvada@linux.intel.com>, "Rafael J.
 Wysocki" <rafael@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>, Linux PM
 <linux-pm@vger.kernel.org>,  LKML <linux-kernel@vger.kernel.org>
Date: Tue, 04 Jun 2024 17:30:16 +0800
In-Reply-To: <1da736da33a61de92314934ecf7fa0420d6d6b81.camel@linux.intel.com>
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On Mon, 2024-06-03 at 21:31 -0700, srinivas pandruvada wrote:

> > > Second, a delayed work can be added to check the MSR long enough
> > > after
> > > initialization and update global.turbo_disabled if it is 1.=20
> > > However,
> > > that would require some code surgery.
> >
> Something like the attached which does same way as user space no_turbo
> update.

> =C2=A0static int intel_pstate_register_driver(struct cpufreq_driver *driv=
er)
> =C2=A0{
> =C2=A0	int ret;
> @@ -3114,6 +3137,9 @@ static int intel_pstate_register_driver(struct cpuf=
req_driver *driver)
> =C2=A0	global.turbo_disabled =3D turbo_is_disabled();
> =C2=A0	global.no_turbo =3D global.turbo_disabled;
> =C2=A0
> +	if (global.turbo_disabled)
> +		schedule_delayed_work(&turbo_work, HZ);
> +

I have to change it to 20 * HZ to make it work for me.  15 * HZ does not
work.

--=20
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University