[PATCH v6 5/5] display/vrr: Update guardband based on enabled latency

[Mitul Golani]

Instead of computing guardband to max vblank, account for
the differenct feature latency.

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
---
 drivers/gpu/drm/i915/display/intel_vrr.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 19a5d0076bb8..a0d3b8e3b167 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -10,7 +10,12 @@
 #include "intel_display_types.h"
 #include "intel_vrr.h"
 #include "intel_vrr_regs.h"
+#include "intel_alpm.h"
+#include "intel_crtc.h"
 #include "intel_dp.h"
+#include "intel_psr.h"
+#include "skl_watermark.h"
+#include "skl_scaler.h"
 
 #define FIXED_POINT_PRECISION		100
 #define CMRR_PRECISION_TOLERANCE	10
@@ -250,13 +255,27 @@ void intel_vrr_compute_config_late(struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
 	const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
+	struct drm_i915_private *i915 = to_i915(display->drm);
+	int required_latency, sagv_block_time_in_scanline;
 
 	if (!intel_vrr_possible(crtc_state))
 		return;
 
+	sagv_block_time_in_scanline =
+		intel_usecs_to_scanlines(&crtc_state->hw.adjusted_mode,
+					 i915->display.sagv.block_time_us);
+	/*
+	 * TODO: DSC and SDP latency to be computed
+	 */
+	required_latency =
+		max3(crtc_state->framestart_delay + calc_scaler_prefill(crtc_state) +
+				calc_wm0_prefill(crtc_state) + sagv_block_time_in_scanline,
+				calc_psr_latency(crtc_state),
+				calc_alpm_latency(crtc_state));
+
 	if (DISPLAY_VER(display) >= 13) {
 		crtc_state->vrr.guardband =
-			crtc_state->vrr.vmin + 1 - adjusted_mode->crtc_vblank_start;
+			intel_usecs_to_scanlines(&crtc_state->hw.adjusted_mode, required_latency);
 	} else {
 		crtc_state->vrr.pipeline_full =
 			min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vblank_start -
-- 
2.46.0