[PATCH v13 1/3] drm/i915/vrr: Add helper to check if vrr possible

[Golani, Mitulkumar Ajitkumar]

> -----Original Message-----
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Sent: Wednesday, October 9, 2024 12:55 PM
> To: Golani, Mitulkumar Ajitkumar <mitulkumar.ajitkumar.golani at intel.com>
> Cc: intel-gfx at lists.freedesktop.org; Nikula, Jani <jani.nikula at intel.com>;
> Syrjala, Ville <ville.syrjala at intel.com>; Nautiyal, Ankit K
> <ankit.k.nautiyal at intel.com>; Shankar, Uma <uma.shankar at intel.com>
> Subject: Re: [PATCH v13 1/3] drm/i915/vrr: Add helper to check if vrr possible
> 
> On Tue, Oct 01, 2024 at 07:17:01PM +0530, Mitul Golani wrote:
> > Add helper to check if vrr is possible based on flipline is computed.
> >
> > Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_vrr.c | 7 ++++++-
> > drivers/gpu/drm/i915/display/intel_vrr.h | 1 +
> >  2 files changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c
> > b/drivers/gpu/drm/i915/display/intel_vrr.c
> > index 9a51f5bac307..79db30e31324 100644
> > --- a/drivers/gpu/drm/i915/display/intel_vrr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_vrr.c
> > @@ -56,6 +56,11 @@ bool intel_vrr_is_in_range(struct intel_connector
> *connector, int vrefresh)
> >  		vrefresh <= info->monitor_range.max_vfreq;  }
> >
> > +bool intel_vrr_possible(const struct intel_crtc_state *crtc_state) {
> > +	return (crtc_state->vrr.flipline) ? true : false;
> 
> That can be just 'return crtc_state->vrr.flipline;', of 'return crtc_state-
> >vrr.flipline != 0;' if you prefer.
> 

Thanks Ville for the review,

I will update it to just return crtc_state->vrr.flipline in next revision.

> > +}
> > +
> >  void
> >  intel_vrr_check_modeset(struct intel_atomic_state *state)  { @@
> > -281,7 +286,7 @@ void intel_vrr_set_transcoder_timings(const struct
> intel_crtc_state *crtc_state)
> >  		intel_de_rmw(display, CHICKEN_TRANS(cpu_transcoder),
> >  			     0, PIPE_VBLANK_WITH_DELAY);
> >
> > -	if (!crtc_state->vrr.flipline) {
> > +	if (!intel_vrr_possible(crtc_state)) {
> 
> Hmm. Looks like we have a fairly big mess with the AS SDP and CMRR stuff
> when it comes to programming the hardware vs. readout. But that's not the
> fault of this patch obviously.
> 
> >  		intel_de_write(display,
> >  			       TRANS_VRR_CTL(display, cpu_transcoder), 0);
> >  		return;
> > diff --git a/drivers/gpu/drm/i915/display/intel_vrr.h
> > b/drivers/gpu/drm/i915/display/intel_vrr.h
> > index 89937858200d..af921dda4619 100644
> > --- a/drivers/gpu/drm/i915/display/intel_vrr.h
> > +++ b/drivers/gpu/drm/i915/display/intel_vrr.h
> > @@ -15,6 +15,7 @@ struct intel_crtc_state;
> >
> >  bool intel_vrr_is_capable(struct intel_connector *connector);  bool
> > intel_vrr_is_in_range(struct intel_connector *connector, int
> > vrefresh);
> > +bool intel_vrr_possible(const struct intel_crtc_state *crtc_state);
> >  void intel_vrr_check_modeset(struct intel_atomic_state *state);  void
> > intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
> >  			      struct drm_connector_state *conn_state);
> > --
> > 2.46.0
> 
> --
> Ville Syrjälä
> Intel