linux-kernel - Re: [PATCH v2] platform/x86: hp-wmi: add support for thermal policy

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Date:   Wed, 7 Oct 2020 16:02:07 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Elia Devito <eliadevito@...il.com>
Cc:     Mark Gross <mgross@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] platform/x86: hp-wmi: add support for thermal policy

Hi,

On 10/5/20 10:57 AM, Andy Shevchenko wrote:
> On Mon, Oct 5, 2020 at 12:14 AM Elia Devito <eliadevito@...il.com> wrote:
>>
>> HP Spectre notebooks (and probably other model as well)
>> support up to 4 thermal policy:
>>   - HP Recommended
>>   - Performance
>>   - Cool
>>   - Quiet
>>
>> at least on HP Spectre x360 Convertible 15-df0xxx the firmware sets the
>> thermal policy to default but hardcode the odvp0 variable to 1, this causes
>> thermald to choose the wrong DPTF profile witch result in low performance
>> when notebook is on AC, calling thermal policy write command allow firmware
>> to correctly set the odvp0 variable.
>>
>> Signed-off-by: Elia Devito <eliadevito@...il.com>
>> ---
>>   drivers/platform/x86/hp-wmi.c | 23 +++++++++++++++++++++++
>>   1 file changed, 23 insertions(+)
>>
>> diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
>> index 1762f335bac9..6e448a79caee 100644
>> --- a/drivers/platform/x86/hp-wmi.c
>> +++ b/drivers/platform/x86/hp-wmi.c
>> @@ -81,6 +81,7 @@ enum hp_wmi_commandtype {
>>          HPWMI_FEATURE2_QUERY            = 0x0d,
>>          HPWMI_WIRELESS2_QUERY           = 0x1b,
>>          HPWMI_POSTCODEERROR_QUERY       = 0x2a,
> 
>> +       HPWMI_THERMAL_POLICY_QUERY      = 0x4c
> 
> Usually we leave a comma that next change won't add any unnecessary churn.
> I don't think this comment requires a v2 right now (may be satisfied
> when applied), but if any other comments come and need to be
> addressed, then this should be included as well.

I've fixed this up while applying this to my review-hans branch, so
there is no need to send out a new version.

Elia, Thank you for your patch, I've applied this patch to me review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Once I've run some tests on this branch the patches there will be added
to the platform-drivers-x86/for-next branch and eventually will be
included in the pdx86 pull-request to Linus for the next merge-window.

Regards,

Hans



> 
>>   };
>>
>>   enum hp_wmi_command {
>> @@ -861,6 +862,26 @@ static int __init hp_wmi_rfkill2_setup(struct platform_device *device)
>>          return err;
>>   }
>>
>> +static int thermal_policy_setup(struct platform_device *device)
>> +{
>> +       int err, tp;
>> +
>> +       tp = hp_wmi_read_int(HPWMI_THERMAL_POLICY_QUERY);
>> +       if (tp < 0)
>> +               return tp;
>> +
>> +       /*
>> +        * call thermal policy write command to ensure that the firmware correctly
>> +        * sets the OEM variables for the DPTF
>> +        */
>> +       err = hp_wmi_perform_query(HPWMI_THERMAL_POLICY_QUERY, HPWMI_WRITE, &tp,
>> +                                                          sizeof(tp), 0);
>> +       if (err)
>> +               return err;
>> +
>> +       return 0;
>> +}
>> +
>>   static int __init hp_wmi_bios_setup(struct platform_device *device)
>>   {
>>          /* clear detected rfkill devices */
>> @@ -872,6 +893,8 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
>>          if (hp_wmi_rfkill_setup(device))
>>                  hp_wmi_rfkill2_setup(device);
>>
>> +       thermal_policy_setup(device);
>> +
>>          return 0;
>>   }
>>
>> --
>> 2.26.2
>>
> 
>