[Intel-gfx] [PATCH 2/2] drm/i915/pps: Enable 2nd pps for dual EDP scenario

[Manna, Animesh]

> -----Original Message-----
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Sent: Friday, September 16, 2022 2:28 PM
> To: Manna, Animesh <animesh.manna at intel.com>
> Cc: intel-gfx at lists.freedesktop.org; Nikula, Jani <jani.nikula at intel.com>;
> Shankar, Uma <uma.shankar at intel.com>
> Subject: Re: [PATCH 2/2] drm/i915/pps: Enable 2nd pps for dual EDP scenario
> 
> On Fri, Sep 16, 2022 at 02:01:02PM +0530, Animesh Manna wrote:
> > >From display gen12 onwards to support dual EDP two instances of pps added.
> > Currently backlight controller and pps instance can be mapped together
> > for a specific panel. Extended support for gen12 for dual EDP usage.
> >
> > v1: Iniital revision
> > v2: Called intel_bios_panel_init w/o PNPID before intel_pps_init.
> > [Jani]
> >
> > Cc: Jani Nikula <jani.nikula at intel.com>
> > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > Cc: Uma Shankar <uma.shankar at intel.com>
> > Signed-off-by: Animesh Manna <animesh.manna at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_bios.c | 7 -------
> > drivers/gpu/drm/i915/display/intel_bios.h | 7 +++++++
> >  drivers/gpu/drm/i915/display/intel_dp.c   | 9 ++++++---
> >  drivers/gpu/drm/i915/display/intel_pps.c  | 2 +-
> >  4 files changed, 14 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_bios.c
> > b/drivers/gpu/drm/i915/display/intel_bios.c
> > index 28bdb936cd1f..5fd4c09dfa96 100644
> > --- a/drivers/gpu/drm/i915/display/intel_bios.c
> > +++ b/drivers/gpu/drm/i915/display/intel_bios.c
> > @@ -706,13 +706,6 @@ static int fallback_get_panel_type(struct
> drm_i915_private *i915,
> >  	return 0;
> >  }
> >
> > -enum panel_type {
> > -	PANEL_TYPE_OPREGION,
> > -	PANEL_TYPE_VBT,
> > -	PANEL_TYPE_PNPID,
> > -	PANEL_TYPE_FALLBACK,
> > -};
> > -
> >  static int get_panel_type(struct drm_i915_private *i915,
> >  			  const struct intel_bios_encoder_data *devdata,
> >  			  const struct edid *edid)
> > diff --git a/drivers/gpu/drm/i915/display/intel_bios.h
> > b/drivers/gpu/drm/i915/display/intel_bios.h
> > index e375405a7828..da01b13260ae 100644
> > --- a/drivers/gpu/drm/i915/display/intel_bios.h
> > +++ b/drivers/gpu/drm/i915/display/intel_bios.h
> > @@ -231,6 +231,13 @@ struct mipi_pps_data {
> >  	u16 panel_power_cycle_delay;
> >  } __packed;
> >
> > +enum panel_type {
> > +	PANEL_TYPE_OPREGION,
> > +	PANEL_TYPE_VBT,
> > +	PANEL_TYPE_PNPID,
> > +	PANEL_TYPE_FALLBACK,
> > +};
> > +
> >  void intel_bios_init(struct drm_i915_private *dev_priv);  void
> > intel_bios_init_panel(struct drm_i915_private *dev_priv,
> >  			   struct intel_panel *panel,
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> > b/drivers/gpu/drm/i915/display/intel_dp.c
> > index c19e99ee06b6..6f7afa75ec4d 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -5222,6 +5222,9 @@ static bool intel_edp_init_connector(struct intel_dp
> *intel_dp,
> >  		return false;
> >  	}
> >
> > +	intel_bios_init_panel(dev_priv, &intel_connector->panel,
> > +			      encoder->devdata, NULL);
> 
> We don't want to go for the fallback type here if we the VBT wants us to use
> pnpid. Maybe we should just remove the fallback type entirely? Or perhaps only
> use it if the VBT panel type is entirely invalid?

Ok, Can I add like below?
If (!PANEL_TYPE_FALLBACK)
	intel_pps_init(intel_dp);

But to read EDID pps_init should be called before it. Or else I can enable both the pps and later disable the unused one.

Regards,
Animesh
 
> > +
> >  	intel_pps_init(intel_dp);
> >
> >  	/* Cache DPCD and EDID for edp. */
> > @@ -5255,9 +5258,9 @@ static bool intel_edp_init_connector(struct intel_dp
> *intel_dp,
> >  		edid = ERR_PTR(-ENOENT);
> >  	}
> >  	intel_connector->edid = edid;
> > -
> > -	intel_bios_init_panel(dev_priv, &intel_connector->panel,
> > -			      encoder->devdata, IS_ERR(edid) ? NULL : edid);
> > +	if (intel_connector->panel.vbt.panel_type == PANEL_TYPE_FALLBACK)
> > +		intel_bios_init_panel(dev_priv, &intel_connector->panel,
> > +				      encoder->devdata, IS_ERR(edid) ? NULL :
> edid);
> >
> >  	intel_panel_add_edid_fixed_modes(intel_connector,
> >  					 intel_connector->panel.vbt.drrs_type
> != DRRS_TYPE_NONE, diff
> > --git a/drivers/gpu/drm/i915/display/intel_pps.c
> > b/drivers/gpu/drm/i915/display/intel_pps.c
> > index b972fa6ec00d..4b8413382c5d 100644
> > --- a/drivers/gpu/drm/i915/display/intel_pps.c
> > +++ b/drivers/gpu/drm/i915/display/intel_pps.c
> > @@ -1430,7 +1430,7 @@ void intel_pps_init(struct intel_dp *intel_dp)
> >  	intel_dp->pps.initializing = true;
> >  	INIT_DELAYED_WORK(&intel_dp->pps.panel_vdd_work,
> > edp_panel_vdd_work);
> >
> > -	if (IS_GEMINILAKE(i915) || IS_BROXTON(i915))
> > +	if (IS_GEMINILAKE(i915) || IS_BROXTON(i915) || DISPLAY_VER(i915) >=
> > +12)
> >  		intel_dp->get_pps_idx = bxt_power_sequencer_idx;
> >  	else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
> >  		intel_dp->get_pps_idx = vlv_power_sequencer_pipe;
> > --
> > 2.29.0
> 
> --
> Ville Syrjälä
> Intel