[PATCH v2 5/6] drm/i915/alpm: Enable lobf from source in ALPM_CTL

[Manna, Animesh]

> -----Original Message-----
> From: Hogander, Jouni <jouni.hogander at intel.com>
> Sent: Monday, April 15, 2024 3:39 PM
> To: Manna, Animesh <animesh.manna at intel.com>; intel-
> gfx at lists.freedesktop.org
> Cc: dri-devel at lists.freedesktop.org; Murthy, Arun R
> <arun.r.murthy at intel.com>; Nikula, Jani <jani.nikula at intel.com>
> Subject: Re: [PATCH v2 5/6] drm/i915/alpm: Enable lobf from source in
> ALPM_CTL
> 
> On Fri, 2024-04-12 at 21:22 +0530, Animesh Manna wrote:
> > Set the Link Off Between Frames Enable bit in ALPM_CTL register.
> >
> > Signed-off-by: Animesh Manna <animesh.manna at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_alpm.c          | 5 +++++
> >  drivers/gpu/drm/i915/display/intel_display_types.h | 1 +
> >  2 files changed, 6 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c
> > b/drivers/gpu/drm/i915/display/intel_alpm.c
> > index 699f2f051766..ae894c85233c 100644
> > --- a/drivers/gpu/drm/i915/display/intel_alpm.c
> > +++ b/drivers/gpu/drm/i915/display/intel_alpm.c
> > @@ -325,6 +325,11 @@ static void lnl_alpm_configure(struct intel_dp
> > *intel_dp)
> >                            ALPM_CTL_EXTENDED_FAST_WAKE_TIME(intel_dp-
> > >alpm_parameters.fast_wake_lines);
> >         }
> >
> > +       if (intel_dp->lobf_supported) {
> > +               alpm_ctl |= ALPM_CTL_LOBF_ENABLE;
> > +               intel_dp->lobf_enabled = true;
> > +       }
> > +
> 
> I don't see lnl_alpm_configure being called for lobf case in your patches.

Enabling/Disabling LOBF will be done along with alpm(aux-wake/aux-less) enablement.
Here lobf_supported flag is the switch to enable LOBF or not.
Please let me know if I am missing anything.

Regards,
Animesh

> 
> BR,
> 
> Jouni Högander
> 
> >         alpm_ctl |= ALPM_CTL_ALPM_ENTRY_CHECK(intel_dp-
> > >alpm_parameters.check_entry_lines);
> >
> >         intel_de_write(dev_priv, ALPM_CTL(cpu_transcoder), alpm_ctl);
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> > b/drivers/gpu/drm/i915/display/intel_display_types.h
> > index 6116c383b543..f61ba582429b 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> > @@ -1884,6 +1884,7 @@ struct intel_dp {
> >
> >         /* LOBF flags*/
> >         bool lobf_supported;
> > +       bool lobf_enabled;
> >  };
> >
> >  enum lspcon_vendor {