linux-kernel - RE: [PATCH v4 11/13] cpufreq: amd_pstate: update transition delay time to 1ms

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Message-ID: <DM4PR12MB5278713C63EC077CACCFF7E69C8F9@DM4PR12MB5278.namprd12.prod.outlook.com>
Date:   Tue, 19 Jul 2022 06:33:15 +0000
From:   "Yuan, Perry" <Perry.Yuan@....com>
To:     "Huang, Ray" <Ray.Huang@....com>
CC:     "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Huang, Shimmer" <Shimmer.Huang@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 11/13] cpufreq: amd_pstate: update transition delay
 time to 1ms

[AMD Official Use Only - General]

Hi Ray. 

> -----Original Message-----
> From: Huang, Ray <Ray.Huang@....com>
> Sent: Tuesday, July 19, 2022 9:05 AM
> To: Yuan, Perry <Perry.Yuan@....com>
> Cc: rafael.j.wysocki@...el.com; viresh.kumar@...aro.org; Sharma, Deepak
> <Deepak.Sharma@....com>; Limonciello, Mario
> <Mario.Limonciello@....com>; Fontenot, Nathan
> <Nathan.Fontenot@....com>; Deucher, Alexander
> <Alexander.Deucher@....com>; Su, Jinzhou (Joe) <Jinzhou.Su@....com>;
> Huang, Shimmer <Shimmer.Huang@....com>; Du, Xiaojian
> <Xiaojian.Du@....com>; Meng, Li (Jassmine) <Li.Meng@....com>; linux-
> pm@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v4 11/13] cpufreq: amd_pstate: update transition delay
> time to 1ms
> 
> On Fri, Jul 15, 2022 at 06:04:30PM +0800, Yuan, Perry wrote:
> > Update transition delay time to 1ms, in the AMD CPU autonomous mode
> > and non-autonomous mode, CPPC firmware will decide frequency at 1ms
> > timescale based on the workload utilization.
> >
> > Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> > Signed-off-by: Perry Yuan <Perry.Yuan@....com>
> > Signed-off-by: Su Jinzhou <Jinzhou.Su@....com>
> 
> Please squeeze this patch into patch 9. I don't really want to separate the
> transition marco update as two patches.
> 
> Thanks,
> Ray

Will update this in V5.
Thanks.

Perry.

> 
> > ---
> >  drivers/cpufreq/amd-pstate.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/cpufreq/amd-pstate.c
> > b/drivers/cpufreq/amd-pstate.c index 4f8600a36194..d3bc441b3923 100644
> > --- a/drivers/cpufreq/amd-pstate.c
> > +++ b/drivers/cpufreq/amd-pstate.c
> > @@ -42,7 +42,7 @@
> >  #include "amd-pstate-trace.h"
> >
> >  #define AMD_PSTATE_TRANSITION_LATENCY	20000
> > -#define AMD_PSTATE_TRANSITION_DELAY	500
> > +#define AMD_PSTATE_TRANSITION_DELAY	1000
> >
> >  /*
> >   * TODO: We need more time to fine tune processors with shared memory
> > solution
> > --
> > 2.32.0
> >