[PATCH 11/15] drm/i915/skl_watermark: Remove redundant latency checks from vblank validation

[Ankit Nautiyal]

Drop DSC and scaler prefill latency checks from skl_is_vblank_too_short().
These are now covered by the guardband validation added during the atomic
CRTC check phase.

This cleanup prepares for future changes where the guardband will be
optimized independently of vblank length, making vblank-based checks
obsolete.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/skl_watermark.c | 79 --------------------
 1 file changed, 79 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
index a8e8e1fbad8f..55dbd05bd7dd 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.c
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -2159,94 +2159,15 @@ static int icl_build_plane_wm(struct intel_crtc_state *crtc_state,
 	return 0;
 }
 
-static int
-cdclk_prefill_adjustment(const struct intel_crtc_state *crtc_state)
-{
-	struct intel_display *display = to_intel_display(crtc_state);
-	struct intel_atomic_state *state =
-		to_intel_atomic_state(crtc_state->uapi.state);
-	const struct intel_cdclk_state *cdclk_state;
-
-	cdclk_state = intel_atomic_get_cdclk_state(state);
-	if (IS_ERR(cdclk_state)) {
-		drm_WARN_ON(display->drm, PTR_ERR(cdclk_state));
-		return 1;
-	}
-
-	return min(1, DIV_ROUND_UP(crtc_state->pixel_rate,
-				   2 * intel_cdclk_logical(cdclk_state)));
-}
-
-static int
-dsc_prefill_latency(const struct intel_crtc_state *crtc_state, int linetime)
-{
-	const struct intel_crtc_scaler_state *scaler_state = &crtc_state->scaler_state;
-	int chroma_downscaling_factor = skl_scaler_chroma_downscale_factor(crtc_state);
-	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
-	int num_scaler_users = hweight32(scaler_state->scaler_users);
-	u64 hscale_k[ARRAY_SIZE(scaler_state->scalers)];
-	u64 vscale_k[ARRAY_SIZE(scaler_state->scalers)];
-	u32 dsc_prefill_latency = 0;
-
-	if (!crtc_state->dsc.compression_enable ||
-	    !num_scaler_users ||
-	    num_scaler_users > crtc->num_scalers ||
-	    num_scaler_users > ARRAY_SIZE(scaler_state->scalers))
-		return dsc_prefill_latency;
-
-	for (int i = 0; i < num_scaler_users; i++) {
-		hscale_k[i] = max(1000, mul_u32_u32(scaler_state->scalers[i].hscale, 1000) >> 16);
-		vscale_k[i] = max(1000, mul_u32_u32(scaler_state->scalers[i].vscale, 1000) >> 16);
-	}
-
-	dsc_prefill_latency =
-		intel_display_dsc_prefill_latency(num_scaler_users, hscale_k, vscale_k,
-						  chroma_downscaling_factor,
-						  cdclk_prefill_adjustment(crtc_state),
-						  linetime);
-
-	return dsc_prefill_latency;
-}
-
-static int
-scaler_prefill_latency(const struct intel_crtc_state *crtc_state, int linetime)
-{
-	const struct intel_crtc_scaler_state *scaler_state = &crtc_state->scaler_state;
-	int chroma_downscaling_factor = skl_scaler_chroma_downscale_factor(crtc_state);
-	int num_scaler_users = hweight32(scaler_state->scaler_users);
-	u64 hscale_k = 1000, vscale_k = 1000;
-	int scaler_prefill_latency = 0;
-
-	if (!num_scaler_users)
-		return scaler_prefill_latency;
-
-	if (num_scaler_users > 1) {
-		hscale_k = max(1000, mul_u32_u32(scaler_state->scalers[0].hscale, 1000) >> 16);
-		vscale_k = max(1000, mul_u32_u32(scaler_state->scalers[0].vscale, 1000) >> 16);
-	}
-
-	scaler_prefill_latency =
-		intel_display_scaler_prefill_latency(num_scaler_users, hscale_k, vscale_k,
-						     chroma_downscaling_factor,
-						     cdclk_prefill_adjustment(crtc_state),
-						     linetime);
-
-	return scaler_prefill_latency;
-}
-
 static bool
 skl_is_vblank_too_short(const struct intel_crtc_state *crtc_state,
 			int wm0_lines, int latency)
 {
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
-	int linetime = DIV_ROUND_UP(1000 * adjusted_mode->htotal,
-				    adjusted_mode->clock);
 
 	return crtc_state->framestart_delay +
 		intel_usecs_to_scanlines(adjusted_mode, latency) +
-		DIV_ROUND_UP(scaler_prefill_latency(crtc_state, linetime), linetime) +
-		DIV_ROUND_UP(dsc_prefill_latency(crtc_state, linetime), linetime) +
 		wm0_lines >
 		adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vblank_start;
 }
-- 
2.45.2