[PATCH v2 05/13] drm/i915/vrr: Add compute config for DC balance params

[Mitul Golani]

Add compute config for DC balance params. This will be required
to calculate correct balance requirement for DMC firmware.

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

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index c4fb78d86ab0..383024dc2784 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -16,6 +16,9 @@
 
 #define FIXED_POINT_PRECISION		100
 #define CMRR_PRECISION_TOLERANCE	10
+#define DCB_CORRECTION_SENSITIVITY	30
+#define DCB_CORRECTION_AGGRESSIVENESS	1000
+#define DCB_BLANK_TARGET		50
 
 bool intel_vrr_is_capable(struct intel_connector *connector)
 {
@@ -409,6 +412,24 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 			(crtc_state->hw.adjusted_mode.crtc_vtotal -
 			 crtc_state->hw.adjusted_mode.vsync_end);
 	}
+
+	if (crtc_state->vrr.dc_balance.enable && HAS_DC_BALANCE(display)) {
+		crtc_state->vrr.dc_balance.vmax = crtc_state->vrr.vmax;
+		crtc_state->vrr.dc_balance.vmin = crtc_state->vrr.vmin;
+		crtc_state->vrr.dc_balance.max_increase =
+			crtc_state->vrr.vmax - crtc_state->vrr.vmin;
+		crtc_state->vrr.dc_balance.max_decrease =
+			crtc_state->vrr.vmax - crtc_state->vrr.vmin;
+		crtc_state->vrr.dc_balance.guardband =
+		DIV_ROUND_UP(crtc_state->vrr.dc_balance.vmax * DCB_CORRECTION_SENSITIVITY,
+			     100);
+		crtc_state->vrr.dc_balance.slope =
+			DIV_ROUND_UP(DCB_CORRECTION_AGGRESSIVENESS * 10,
+				     crtc_state->vrr.dc_balance.guardband);
+		crtc_state->vrr.dc_balance.vblank_target =
+		DIV_ROUND_UP((crtc_state->vrr.vmax - crtc_state->vrr.vmin) * DCB_BLANK_TARGET,
+			     100);
+	}
 }
 
 void intel_vrr_compute_config_late(struct intel_crtc_state *crtc_state)
-- 
2.48.1