> -----Original Message----- > From: Intel-gfx <[email protected]> On Behalf Of Ville > Syrjala > Sent: Wednesday, October 8, 2025 11:56 PM > To: [email protected] > Cc: [email protected] > Subject: [RFC][PATCH 04/11] drm/i915/dsc: Add prefill helper for DSC > > From: Ville Syrjälä <[email protected]> > > Add intel_vdsc_prefill_lines() which tells us how many extra lines of latency > the > DSC adds to the pipe prefill. > > We shouldn't need a "worst case" vs, "current case" split here as the DSC > state > should only change during full modesets. > > The returned numbers are in .16 binary fixed point.
Looks Good to me. Reviewed-by: Uma Shankar <[email protected]> > Signed-off-by: Ville Syrjälä <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_vdsc.c | 8 ++++++++ > drivers/gpu/drm/i915/display/intel_vdsc.h | 1 + > 2 files changed, 9 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c > b/drivers/gpu/drm/i915/display/intel_vdsc.c > index 8e799e225af1..bca747e24a7f 100644 > --- a/drivers/gpu/drm/i915/display/intel_vdsc.c > +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c > @@ -1077,3 +1077,11 @@ int intel_vdsc_min_cdclk(const struct intel_crtc_state > *crtc_state) > > return min_cdclk; > } > + > +unsigned int intel_vdsc_prefill_lines(const struct intel_crtc_state > +*crtc_state) { > + if (!crtc_state->dsc.compression_enable) > + return 0; > + > + return 0x18000; /* 1.5 */ > +} > diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.h > b/drivers/gpu/drm/i915/display/intel_vdsc.h > index 9e2812f99dd7..2139391ff881 100644 > --- a/drivers/gpu/drm/i915/display/intel_vdsc.h > +++ b/drivers/gpu/drm/i915/display/intel_vdsc.h > @@ -32,5 +32,6 @@ void intel_dsc_dp_pps_write(struct intel_encoder *encoder, > void intel_vdsc_state_dump(struct drm_printer *p, int indent, > const struct intel_crtc_state *crtc_state); int > intel_vdsc_min_cdclk(const struct intel_crtc_state *crtc_state); > +unsigned int intel_vdsc_prefill_lines(const struct intel_crtc_state > +*crtc_state); > > #endif /* __INTEL_VDSC_H__ */ > -- > 2.49.1
