Commit d7cc4b6b authored by Ville Syrjälä's avatar Ville Syrjälä
Browse files

drm/i915/dsc: Add prefill helper for DSC 



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.

Reviewed-by: default avatarUma Shankar <uma.shankar@intel.com>
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20251014191808.12326-6-ville.syrjala@linux.intel.com
parent 4157c756

drivers/gpu/drm/i915/display/intel_vdsc.c

+8 −0
Original line number Diff line number Diff line
@@ -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 */

}

drivers/gpu/drm/i915/display/intel_vdsc.h

+1 −0
Original line number Diff line number Diff line
@@ -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__ */