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drm/i915/dsc: Add prefill helper for DSC

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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: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20251014191808.12326-6-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2025-10-14 22:18:04 +03:00
parent 4157c75604
commit d7cc4b6bc9
2 changed files with 9 additions and 0 deletions
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8
drivers/gpu/drm/i915/display/intel_vdsc.c
View File

@ -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 */
}

1
drivers/gpu/drm/i915/display/intel_vdsc.h
View File

@ -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__ */