[PATCH 6/7] drm/i915/psr: Add VRR send push interface for PSR usage

[Hogander, Jouni]

On Thu, 2024-10-10 at 11:03 +0300, Jani Nikula wrote:
> On Thu, 10 Oct 2024, Jouni Högander <jouni.hogander at intel.com> wrote:
> > Add own interface for PSR usage to perform push on frontbuffer
> > tracking
> > invalidate and flush call backs. Use this new interface from PSR
> > code.
> > 
> > Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_psr.c |  7 ++++++-
> >  drivers/gpu/drm/i915/display/intel_vrr.c | 18 ++++++++++++++++++
> >  drivers/gpu/drm/i915/display/intel_vrr.h |  4 ++++
> >  3 files changed, 28 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> > b/drivers/gpu/drm/i915/display/intel_psr.c
> > index 5be8076475f0b..7959a33771b13 100644
> > --- a/drivers/gpu/drm/i915/display/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> > @@ -2326,8 +2326,13 @@ static void psr_force_exit(struct intel_dp
> > *intel_dp)
> >          * This workaround do not exist for platforms with display
> > 10 or newer
> >          * but testing proved that it works for up display 13, for
> > newer
> >          * than that testing will be needed.
> > +        *
> > +        * In Lunarlake we can use TRANS_PUSH mechanism to force
> > sending update
> > +        * to sink.
> >          */
> > -       intel_de_write(display, CURSURFLIVE(display, intel_dp-
> > >psr.pipe), 0);
> > +       DISPLAY_VER(display) >= 20 ?
> > +               intel_vrr_psr_send_push(display, cpu_transcoder) :
> > +               intel_de_write(display, CURSURFLIVE(display,
> > intel_dp->psr.pipe), 0);
> >  }
> >  
> >  void intel_psr2_program_trans_man_trk_ctl(const struct
> > intel_crtc_state *crtc_state)
> > diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c
> > b/drivers/gpu/drm/i915/display/intel_vrr.c
> > index 5925ade4591d4..d51830d173b61 100644
> > --- a/drivers/gpu/drm/i915/display/intel_vrr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_vrr.c
> > @@ -328,6 +328,24 @@ void intel_vrr_send_push(const struct
> > intel_crtc_state *crtc_state)
> >                        trans_push_val);
> >  }
> >  
> > +/**
> > + * intel_vrr_psr_send_push - Send push interface for PSR code
> > + * @display: Intel display
> > + * @cpu_transcoder: cpu_transcode
> > + *
> > + * This is for PSR usage to perform push on frontbuffer tracking
> > invalidate and
> > + * flush call back. PSR mutex should be taken by caller.
> > + */
> > +void intel_vrr_psr_send_push(struct intel_display *display,
> > +                            enum transcoder cpu_transcoder)
> > +{
> > +       if (DISPLAY_VER(display) < 20)
> > +               return;
> > +
> > +       intel_de_rmw(display, TRANS_PUSH(display, cpu_transcoder),
> > 0,
> > +                    TRANS_PUSH_SEND | LNL_TRANS_PUSH_PSR_PR_EN);
> > +}
> > +
> >  bool intel_vrr_is_push_sent(const struct intel_crtc_state
> > *crtc_state)
> >  {
> >         struct intel_display *display =
> > to_intel_display(crtc_state);
> > diff --git a/drivers/gpu/drm/i915/display/intel_vrr.h
> > b/drivers/gpu/drm/i915/display/intel_vrr.h
> > index a75f159168c11..3da7ba12697ff 100644
> > --- a/drivers/gpu/drm/i915/display/intel_vrr.h
> > +++ b/drivers/gpu/drm/i915/display/intel_vrr.h
> > @@ -12,6 +12,8 @@ struct drm_connector_state;
> >  struct intel_atomic_state;
> >  struct intel_connector;
> >  struct intel_crtc_state;
> > +struct intel_display;
> > +enum transcoder;
> >  
> >  bool intel_vrr_is_capable(struct intel_connector *connector);
> >  bool intel_vrr_is_in_range(struct intel_connector *connector, int
> > vrefresh);
> > @@ -25,6 +27,8 @@ bool intel_vrr_is_push_sent(const struct
> > intel_crtc_state *crtc_state);
> >  void intel_vrr_disable(const struct intel_crtc_state
> > *old_crtc_state);
> >  void intel_vrr_psr_frame_change_enable(const struct
> > intel_crtc_state *crtc_state);
> >  void intel_vrr_psr_frame_change_disable(const struct
> > intel_crtc_state *crtc_state);
> > +void intel_vrr_psr_send_push(struct intel_display *display,
> > +                            enum transcoder cpu_transcoder);
> 
> Nitpick, why not just make that parameter crtc_state like for all the
> other functions?

This is about to be used from frontbuffer flush/invalidate path as
well. There we do not have crtc_state directly. I'll guess we could use
current state of crtc. Do you think that would be better? 

BR,

Jouni Högander

> 
> BR,
> Jani.
> 
> >  void intel_vrr_get_config(struct intel_crtc_state *crtc_state);
> >  int intel_vrr_vmax_vblank_start(const struct intel_crtc_state
> > *crtc_state);
> >  int intel_vrr_vmin_vblank_start(const struct intel_crtc_state
> > *crtc_state);
>