drm/i915/wm: Add WM0 prefill helpers

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Add skl_wm0_prefill_lines() (based on the actual state) and
skl_wm0_prefill_lines_worst() (worst case estimate) which
tell us how many extra lines are needed in prefill for WM0.

The returned numbers are in .16 binary fixed point.

TODO: skl_wm0_prefill_lines_worst() is a bit rough still

v2: Drop all pre-icl FIXMEs since this only gets used for VRR guardband

Reviewed-by: Uma Shankar <uma.shankar@intel.com> #v1
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20251014191808.12326-8-ville.syrjala@linux.intel.com

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This commit is contained in:

Ville Syrjälä 2025-10-14 22:18:06 +03:00

parent b95e31cdfc

commit 9704c1cbed

4 changed files with 95 additions and 1 deletions

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32

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

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4

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

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57

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

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3

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

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