[Intel-gfx] [PATCH 2/2] drm/i915/pps: Enable 2nd pps for dual EDP scenario
Manna, Animesh
animesh.manna at intel.com
Tue Sep 27 17:53:25 UTC 2022
> -----Original Message-----
> From: Nikula, Jani <jani.nikula at intel.com>
> Sent: Monday, September 26, 2022 4:06 PM
> To: Manna, Animesh <animesh.manna at intel.com>; Ville Syrjälä
> <ville.syrjala at linux.intel.com>
> Cc: intel-gfx at lists.freedesktop.org; Shankar, Uma <uma.shankar at intel.com>
> Subject: RE: [PATCH 2/2] drm/i915/pps: Enable 2nd pps for dual EDP scenario
>
> On Tue, 20 Sep 2022, "Manna, Animesh" <animesh.manna at intel.com> wrote:
> >> -----Original Message-----
> >> From: Nikula, Jani <jani.nikula at intel.com>
> >> Sent: Friday, September 16, 2022 5:00 PM
> >> To: Manna, Animesh <animesh.manna at intel.com>; Ville Syrjälä
> >> <ville.syrjala at linux.intel.com>
> >> Cc: intel-gfx at lists.freedesktop.org; Shankar, Uma
> >> <uma.shankar at intel.com>
> >> Subject: RE: [PATCH 2/2] drm/i915/pps: Enable 2nd pps for dual EDP
> >> scenario
> >>
> >> On Fri, 16 Sep 2022, "Manna, Animesh" <animesh.manna at intel.com> wrote:
> >> >> -----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,
> >> >> > +};
> >> >> > +
> >>
> >> I don't want enum panel_type exposed from intel_bios.c at all,
> >> there's no reason for that.
> >
> > Hi Jani,
> >
> > Thanks for your inputs. I have made the changes as per your suggestion.
> > I have a doubt which is mentioned below, currently have sent to trybot for
> quick feedback.
> > https://patchwork.freedesktop.org/patch/503759/?series=108786&rev=1
>
> I'm not subscribed to the trybot list, so I can't easily reply with comments.
>
> Use trybot only to *test* stuff, not if you want human feedback.
>
> >
> >>
> >> >> > 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.
> >>
> >> The first call should init everything if it can (panel type is *not*
> >> pnpid). Fallback is fine in that case too.
> >
> > First time intel_bios_init_panel() will be called with null edid and panel type will
> be set to PANEL_TYPE_FALLBACK.
> >
> >>
> >> If panel type indicates pnpid, intel_bios_init_panel() should set the
> >> pps id to, say, -1, so intel_pps_init() or more specifically
> >> bxt_power_sequencer_idx() can use some default or look at the
> >> hardware or whatever.
> >
> > Currently checking for PANEL_TYPE_PNPID in intel_bios_init_panel() and
> setting pps id to -1.
> > But I am not sure why special handling is needed in
> bxt_power_sequencer_idx().
> > Is backlight_controller value can be used to derive pps instance for
> PANEL_TYPE_PNPID.
>
> Backlight controller and pps index are basically the *same* thing. If PNPID is
> used, the backlight controller is uninitialized.
>
> This is actually a bug in the current code, even for single panel configurations, if
> someone has chosen to use the 2nd pps/backlight.
I have sent the next version for review.
https://patchwork.freedesktop.org/series/109135/
Can you please have a look.
Regards,
Animesh
>
> BR,
> Jani.
>
> >
> >>
> >> intel_bios_init_panel() should probably also return a value on pnpid
> >> indicating
> >> intel_edp_init_connector() should call
> >> intel_bios_init_panel() again, this time with EDID. (Note: I kind of
> >> like separating returning the value and setting the pps id to -1. I
> >> don't want
> >> intel_edp_init_connector() to look at pps id, that's for pps, and I
> >> don't want to pass flags all the way to bxt_power_sequencer_idx()
> >> either.)
> >
> > For PANEL_TYPE_PNPID am returning boolean retry, with that don’t need to
> move panet type enum to intel_bios.h.
> > If the retry is true will call intel_bios_init_panel() with edid to check for
> PANEL_TYPE_PNPID.
> >
> > Regards,
> > Animesh
> >
> >>
> >>
> >> BR,
> >> Jani.
> >>
> >>
> >> >
> >> > 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
> >>
> >> --
> >> Jani Nikula, Intel Open Source Graphics Center
>
> --
> Jani Nikula, Intel Open Source Graphics Center
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