From: Ville Syrjälä <[email protected]> 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 <[email protected]> Signed-off-by: Ville Syrjälä <[email protected]> --- drivers/gpu/drm/i915/display/intel_cdclk.c | 12 ++++++++++++ drivers/gpu/drm/i915/display/intel_cdclk.h | 3 +++ 2 files changed, 15 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c index 10abc2521fab..bd45b719d4f8 100644 --- a/drivers/gpu/drm/i915/display/intel_cdclk.c +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c @@ -4120,3 +4120,15 @@ unsigned int intel_cdclk_prefill_adjustment_worst(const struct intel_crtc_state return _intel_cdclk_prefill_adj(crtc_state, clock, min_cdclk); } + +int intel_cdclk_min_cdclk_for_prefill(const struct intel_crtc_state *crtc_state, + unsigned int prefill_lines_unadjusted, + unsigned int prefill_lines_available) +{ + struct intel_display *display = to_intel_display(crtc_state); + const struct drm_display_mode *pipe_mode = &crtc_state->hw.pipe_mode; + int ppc = intel_cdclk_ppc(display, crtc_state->double_wide); + + return DIV_ROUND_UP_ULL(mul_u32_u32(pipe_mode->crtc_clock, prefill_lines_unadjusted), + ppc * prefill_lines_available); +} diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.h b/drivers/gpu/drm/i915/display/intel_cdclk.h index 8774a320670b..1c1140b53b17 100644 --- a/drivers/gpu/drm/i915/display/intel_cdclk.h +++ b/drivers/gpu/drm/i915/display/intel_cdclk.h @@ -72,5 +72,8 @@ void intel_cdclk_read_hw(struct intel_display *display); unsigned int intel_cdclk_prefill_adjustment(const struct intel_crtc_state *crtc_state); unsigned int intel_cdclk_prefill_adjustment_worst(const struct intel_crtc_state *crtc_state); +int intel_cdclk_min_cdclk_for_prefill(const struct intel_crtc_state *crtc_state, + unsigned int prefill_lines_unadjusted, + unsigned int prefill_lines_available); #endif /* __INTEL_CDCLK_H__ */ -- 2.49.1
