linux-kernel - Re: [PATCH v3] intel_idle: Add Comet Lake support

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Date:   Wed, 4 Mar 2020 11:57:33 +0000
From:   "Pan, Harry" <harry.pan@...el.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
CC:     LKML <linux-kernel@...r.kernel.org>, Harry Pan <gs0622@...il.com>,
        "Jacob Pan" <jacob.jun.pan@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v3] intel_idle: Add Comet Lake support

Hi Rafael,

Yes, I skipped it considering to align CML-U V0 and A0 stepping w/ the same table; I sent v4 for your review.

In the other hand, I am proposing using _CST as long term plan in CrOS dev teams.


Sincerely,
Harry

> On Mar 4, 2020, at 17:53, Rafael J. Wysocki <rafael@...nel.org> wrote:
> 
> On Tue, Mar 3, 2020 at 10:10 AM Harry Pan <harry.pan@...el.com> wrote:
>> 
>> Add a general C-state table in order to support Comet Lake.
>> 
>> Signed-off-by: Harry Pan <harry.pan@...el.com>
>> 
>> ---
>> 
>> drivers/idle/intel_idle.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>> 
>> diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
>> index d55606608ac8..05bce595fafe 100644
>> --- a/drivers/idle/intel_idle.c
>> +++ b/drivers/idle/intel_idle.c
>> @@ -1067,6 +1067,11 @@ static const struct idle_cpu idle_cpu_dnv = {
>>        .use_acpi = true,
>> };
>> 
>> +static const struct idle_cpu idle_cpu_cml = {
>> +       .state_table = skl_cstates,
>> +       .disable_promotion_to_c1e = true,
> 
> .use_acpi = true,
> 
> missing?  Otherwise you can just use idle_cpu_skl as is, can't you?
> 
>> +};
>> +
>> static const struct x86_cpu_id intel_idle_ids[] __initconst = {
>>        INTEL_CPU_FAM6(NEHALEM_EP,              idle_cpu_nhx),
>>        INTEL_CPU_FAM6(NEHALEM,                 idle_cpu_nehalem),
>> @@ -1105,6 +1110,8 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
>>        INTEL_CPU_FAM6(ATOM_GOLDMONT_PLUS,      idle_cpu_bxt),
>>        INTEL_CPU_FAM6(ATOM_GOLDMONT_D,         idle_cpu_dnv),
>>        INTEL_CPU_FAM6(ATOM_TREMONT_D,          idle_cpu_dnv),
>> +       INTEL_CPU_FAM6(COMETLAKE_L,             idle_cpu_cml),
>> +       INTEL_CPU_FAM6(COMETLAKE,               idle_cpu_cml),
>>        {}
>> };
>> 
>> --
>> 2.24.1
>>