[PATCH] amdgpu/pm: Don't show `smartshift_*_power` files for APUs

[Sundararaju, Sathishkumar]

[AMD Official Use Only]

Hi Mario,

amdgpu_device_supports_smart_shift() is to check if the device is dGPU and platform supports smartshift. 
which would fail for iGPU and so the attr_update() will return unsupported, due to this on SS1.0 platform the entries won't be created.

Regards,
Sathish 

-----Original Message-----
From: Limonciello, Mario <Mario.Limonciello at amd.com> 
Sent: Thursday, March 10, 2022 11:45 PM
To: Sundararaju, Sathishkumar <Sathishkumar.Sundararaju at amd.com>; Lazar, Lijo <Lijo.Lazar at amd.com>; amd-gfx at lists.freedesktop.org
Subject: RE: [PATCH] amdgpu/pm: Don't show `smartshift_*_power` files for APUs

[AMD Official Use Only]

I'm not familiar with SS 1.0 in this regard, can you explain why it would fail to make the attributes?
I would think the attributes should show up because of amdgpu_device_supports_smart_shift?
Or are the checks done in that function not sufficient for SS 1.0?

> -----Original Message-----
> From: Sundararaju, Sathishkumar <Sathishkumar.Sundararaju at amd.com>
> Sent: Thursday, March 10, 2022 05:19
> To: Lazar, Lijo <Lijo.Lazar at amd.com>; Limonciello, Mario 
> <Mario.Limonciello at amd.com>; amd-gfx at lists.freedesktop.org
> Subject: RE: [PATCH] amdgpu/pm: Don't show `smartshift_*_power` files 
> for APUs
> 
> [AMD Official Use Only]
> 
> This will fail to create the sysfs attributes for SS1.0.
> 
> Regards,
> Sathish
> 
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of 
> Lazar, Lijo
> Sent: Thursday, March 10, 2022 10:58 AM
> To: Limonciello, Mario <Mario.Limonciello at amd.com>; amd- 
> gfx at lists.freedesktop.org
> Subject: Re: [PATCH] amdgpu/pm: Don't show `smartshift_*_power` files 
> for APUs
> 
> 
> 
> On 3/10/2022 3:35 AM, Mario Limonciello wrote:
> > `smartshift_*_power` files are showing up on some OEM programs on 
> > the APU instead of the dGPU.
> >
> > Adjust the logic to the function `ss_power_attr_update` to detect 
> > whether or not the attributes should be exported.
> >
> > The existing checks that are dropped are already included in 
> > `amdgpu_device_support_smart_shift`, so this can be simplified.
> > This causes attributes to not be shown on APUs.
> >
> > Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>
> > ---
> >   drivers/gpu/drm/amd/pm/amdgpu_pm.c | 5 +----
> >   1 file changed, 1 insertion(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > index cbbbd4079249..ccd0648c6789 100644
> > --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > @@ -1884,10 +1884,7 @@ static int ss_power_attr_update(struct
> amdgpu_device *adev, struct amdgpu_device
> >   {
> >   	uint32_t ss_power, size;
> >
> > -	if (!amdgpu_acpi_is_power_shift_control_supported())
> > -		*states = ATTR_STATE_UNSUPPORTED;
> > -	else if ((adev->flags & AMD_IS_PX) &&
> > -
> !amdgpu_device_supports_smart_shift(adev_to_drm(adev)))
> > +	if (!amdgpu_device_supports_smart_shift(adev_to_drm(adev)))
> >   		*states = ATTR_STATE_UNSUPPORTED;
> 
> SS 1.0 attributes are supported on APU devices. Will this work on those?
> 
> Thanks,
> Lijo
> 
> >   	else if (amdgpu_dpm_read_sensor(adev,
> AMDGPU_PP_SENSOR_SS_APU_SHARE,
> >   		 (void *)&ss_power, &size))
> >