Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
drm/i915/cdclk: Add intel_cdclk_min_cdclk_for_prefill()
Introduce a helper to compute the min required cdclk frequency
for a given guardband size. This could be used to bump up the
cdclk in case the vblank is so small that the normally computed
minimum cdclk results in too slow a prefill.
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/20251014191808.12326-5-ville.syrjala@linux.intel.com
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drivers/gpu/drm/i915/display/intel_cdclk.c
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drivers/gpu/drm/i915/display/intel_cdclk.c
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return _intel_cdclk_prefill_adj(crtc_state, clock, min_cdclk);
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}
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int intel_cdclk_min_cdclk_for_prefill(const struct intel_crtc_state *crtc_state,
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unsigned int prefill_lines_unadjusted,
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unsigned int prefill_lines_available)
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{
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struct intel_display *display = to_intel_display(crtc_state);
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const struct drm_display_mode *pipe_mode = &crtc_state->hw.pipe_mode;
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int ppc = intel_cdclk_ppc(display, crtc_state->double_wide);
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return DIV_ROUND_UP_ULL(mul_u32_u32(pipe_mode->crtc_clock, prefill_lines_unadjusted),
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ppc * prefill_lines_available);
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}
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drivers/gpu/drm/i915/display/intel_cdclk.h
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drivers/gpu/drm/i915/display/intel_cdclk.h
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unsigned int intel_cdclk_prefill_adjustment(const struct intel_crtc_state *crtc_state);
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unsigned int intel_cdclk_prefill_adjustment_worst(const struct intel_crtc_state *crtc_state);
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int intel_cdclk_min_cdclk_for_prefill(const struct intel_crtc_state *crtc_state,
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unsigned int prefill_lines_unadjusted,
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unsigned int prefill_lines_available);
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#endif /* __INTEL_CDCLK_H__ */