> -----Original Message-----
> From: Hogander, Jouni <jouni.hogander@xxxxxxxxx>
> Sent: Friday, May 3, 2024 1:18 PM
> To: Manna, Animesh <animesh.manna@xxxxxxxxx>; intel-
> gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx; Murthy, Arun R
> <arun.r.murthy@xxxxxxxxx>; Nikula, Jani <jani.nikula@xxxxxxxxx>
> Subject: Re: [PATCH v3 5/6] drm/i915/alpm: Enable lobf from source in
> ALPM_CTL
>
> On Thu, 2024-04-25 at 00:08 +0530, Animesh Manna wrote:
> > Set the Link Off Between Frames Enable bit in ALPM_CTL register.
> >
> > Note: Lobf need to be enabled adaptive sync fixed refresh mode where
> > vmin = vmax = flipline, which will arise after cmmr feature
> > enablement. Will add enabling sequence in a separate patch.
>
> Is adaptive sync needed for both Aux Wake and Aux Less Wake?
AFAIK, ALPM (aux-wake/aux-less) do not have any dependency on adaptive sync.
But LOBF is dependent on ALPM (aux-wake/aux-less) and adaptive sync fixed refresh mode.
>
> >
> > Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/display/intel_alpm.c | 13 +++++++++----
> > drivers/gpu/drm/i915/display/intel_alpm.h | 4 ++--
> > drivers/gpu/drm/i915/display/intel_psr.c | 2 +-
> > 3 files changed, 12 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c
> > b/drivers/gpu/drm/i915/display/intel_alpm.c
> > index 3bb69ed16aab..b08799586b58 100644
> > --- a/drivers/gpu/drm/i915/display/intel_alpm.c
> > +++ b/drivers/gpu/drm/i915/display/intel_alpm.c
> > @@ -290,10 +290,11 @@ void intel_alpm_compute_lobf_config(struct
> > intel_dp *intel_dp,
> > }
> > }
> >
> > -static void lnl_alpm_configure(struct intel_dp *intel_dp)
> > +static void lnl_alpm_configure(struct intel_dp *intel_dp,
> > + const struct intel_crtc_state
> > *crtc_state)
> > {
> > struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> > - enum transcoder cpu_transcoder = intel_dp->psr.transcoder;
> > + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> > u32 alpm_ctl;
> >
> > if (DISPLAY_VER(dev_priv) < 20 || (!intel_dp-
> > >psr.psr2_enabled &&
> > @@ -329,12 +330,16 @@ static void lnl_alpm_configure(struct intel_dp
> > *intel_dp)
> > ALPM_CTL_EXTENDED_FAST_WAKE_TIME(intel_dp-
> > >alpm_parameters.fast_wake_lines);
> > }
> >
> > + if (crtc_state->has_lobf)
> > + alpm_ctl |= ALPM_CTL_LOBF_ENABLE;
> > +
>
> How you are planning to differentiate between AUX Wake and AUX Less
> Wake for LOBF?
LOBF can be enabled in both aux-wake or aux-less alpm. So, check for aux-wake or aux-less is not needed.
For aux wake ALPM_CTL[ ALPM AUX Less Enable ] = 0
and for aux less ALPM_CTL[ ALPM AUX Less Enable ] = 1.
So, I am plaining to add has_lobf check and enable if needed before ALPM_CTL register is getting programmed. Do you see any issue here?
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);
> > }
> >
> > -void intel_alpm_configure(struct intel_dp *intel_dp)
> > +void intel_alpm_configure(struct intel_dp *intel_dp,
> > + const struct intel_crtc_state *crtc_state)
> > {
> > - lnl_alpm_configure(intel_dp);
> > + lnl_alpm_configure(intel_dp, crtc_state);
> > }
> > diff --git a/drivers/gpu/drm/i915/display/intel_alpm.h
> > b/drivers/gpu/drm/i915/display/intel_alpm.h
> > index b9602b71d28f..a9ca190da3e4 100644
> > --- a/drivers/gpu/drm/i915/display/intel_alpm.h
> > +++ b/drivers/gpu/drm/i915/display/intel_alpm.h
> > @@ -18,6 +18,6 @@ bool intel_alpm_compute_params(struct intel_dp
> > *intel_dp,
> > void intel_alpm_compute_lobf_config(struct intel_dp *intel_dp,
> > struct intel_crtc_state
> > *crtc_state,
> > struct drm_connector_state
> > *conn_state); -void intel_alpm_configure(struct intel_dp *intel_dp);
> > -
> > +void intel_alpm_configure(struct intel_dp *intel_dp,
> > + const struct intel_crtc_state *crtc_state);
> > #endif
> > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> > b/drivers/gpu/drm/i915/display/intel_psr.c
> > index c4ab289dbc15..4eb45df20ad2 100644
> > --- a/drivers/gpu/drm/i915/display/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> > @@ -1611,7 +1611,7 @@ static void intel_psr_enable_source(struct
> > intel_dp *intel_dp,
> > IGNORE_PSR2_HW_TRACKING : 0);
> >
> > if (intel_dp_is_edp(intel_dp))
> > - intel_alpm_configure(intel_dp);
> > + intel_alpm_configure(intel_dp, crtc_state);
> >
> > /*
> > * Wa_16013835468
