[Intel-gfx] [PATCH] drm/i915/hwmon: Enable PL1 power limit

[Dixit, Ashutosh]

On Tue, 07 Feb 2023 01:32:44 -0800, Matthew Auld wrote:
>
> On Fri, 3 Feb 2023 at 15:54, Ashutosh Dixit <ashutosh.dixit at intel.com> wrote:
> >
> > Previous documentation suggested that PL1 power limit is always
> > enabled. However we now find this not to be the case on some
> > platforms (such as ATSM). Therefore enable PL1 power limit during hwmon
> > initialization.
>
> For some reason it looks like this change is impacting the atsm in CI:
> https://intel-gfx-ci.01.org/tree/drm-tip/bat-atsm-1.html

Hmm, the change was meant for ATSM. Anyway let me try to get hold of an
ATSM and see if I can figure out what might be going on with these
seemingly unrelated failures and if I can repro them locally. Thanks!

>
> >
> > Bspec: 51864
> >
> > v2: Add Bspec reference (Gwan-gyeong)
> > v3: Add Fixes tag
> >
> > Fixes: 99f55efb79114 ("drm/i915/hwmon: Power PL1 limit and TDP setting")
> > Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
> > Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_hwmon.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c
> > index 1225bc432f0d5..4683a5b96eff1 100644
> > --- a/drivers/gpu/drm/i915/i915_hwmon.c
> > +++ b/drivers/gpu/drm/i915/i915_hwmon.c
> > @@ -687,6 +687,11 @@ hwm_get_preregistration_info(struct drm_i915_private *i915)
> >                 for_each_gt(gt, i915, i)
> >                         hwm_energy(&hwmon->ddat_gt[i], &energy);
> >         }
> > +
> > +       /* Enable PL1 power limit */
> > +       if (i915_mmio_reg_valid(hwmon->rg.pkg_rapl_limit))
> > +               hwm_locked_with_pm_intel_uncore_rmw(ddat, hwmon->rg.pkg_rapl_limit,
> > +                                                   PKG_PWR_LIM_1_EN, PKG_PWR_LIM_1_EN);
> >  }
> >
> >  void i915_hwmon_register(struct drm_i915_private *i915)
> > --
> > 2.38.0
> >