[PATCH 10/10] drm/amd/pp: Enable auto automan feature on Polaris

[Alex Deucher]

On Thu, Feb 8, 2018 at 10:14 AM, Zhu, Rex <Rex.Zhu at amd.com> wrote:
> if user select manual dpm mode，we will disabe autowattman.
> When switch to auto, we will restart the auto wattman on Polaris,
> Restore to default profile mode on other ASICS.
>

But in auto mode, we may want to force a particular profile within the
driver for a specific use case.  E.g., for VR, we may want to select
the VR profile when the user sets the priority to high in the context
ioctl, and then switch it back to autowattman or the default profile
when the context if freed or the priority is changes.  We may want to
do something similar for video when the user submits work to the
multi-media engines.  It's possible autowattman will perform ok and we
don't need to manually change the profile in the driver, but we'll
have to do some profiling to sort that out.  I guess it should just be
a matter of disabling autowattman and switching to a profile when the
driver needs it and then switching back when it's done.

Alex

>
> Best Regards
> Rex
> ________________________________
> From: Alex Deucher <alexdeucher at gmail.com>
> Sent: Thursday, February 8, 2018 11:02:21 PM
> To: Zhu, Rex
> Cc: amd-gfx list
> Subject: Re: [PATCH 10/10] drm/amd/pp: Enable auto automan feature on
> Polaris
>
> On Thu, Feb 8, 2018 at 4:14 AM, Rex Zhu <Rex.Zhu at amd.com> wrote:
>> Change-Id: I69b24ce65ddb361a89e5ac9b197ae6df9b60a9e5
>> Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>
>
> Would be good to give a brief description of what autowattman actually
> does in the patch description.  Also, we may need to manually select a
> profile in some cases (e.g., VR).  Would that be a problem with
> autowattman?
>
> Alex
>
>> ---
>>  drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
>> b/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
>> index f50b6cd..549e830 100644
>> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
>> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
>> @@ -1023,6 +1023,10 @@ int polaris_set_asic_special_caps(struct pp_hwmgr
>> *hwmgr)
>>                 phm_cap_set(hwmgr->platform_descriptor.platformCaps,
>>
>> PHM_PlatformCaps_TCPRamping);
>>         }
>> +
>> +       if (hwmgr->feature_mask & PP_AUTOWATTMAN_MASK)
>> +               hwmgr->autowattman_enabled = true; /* currently only
>> enabled on polaris */
>> +
>>         return 0;
>>  }
>>
>> --
>> 1.9.1
>>
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