[PATCH v4 10/17] drm/i915/vrr: Write DC balance params to hw registers

[Mitul Golani]

Write DC Balance parameters to hw registers.

--v2:
- Update commit header.
- Separate crtc_state params from this patch. (Ankit)

--v3:
- Write registers at compute config.
- Update condition for write.

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

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index dcaae7631b0a..420ee917d6a9 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -483,6 +483,8 @@ void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
 	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	enum pipe pipe = crtc->pipe;
 
 	/*
 	 * This bit seems to have two meanings depending on the platform:
@@ -510,6 +512,24 @@ void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
 			       lower_32_bits(crtc_state->cmrr.cmrr_n));
 	}
 
+	if (HAS_VRR_DC_BALANCE(display) &&
+	    (crtc_state->vrr.dc_balance.vmin || crtc_state->vrr.dc_balance.vmax)) {
+		intel_de_write(display, PIPEDMC_DCB_VMIN(pipe),
+			       crtc_state->vrr.dc_balance.vmin - 1);
+		intel_de_write(display, PIPEDMC_DCB_VMAX(pipe),
+			       crtc_state->vrr.dc_balance.vmax - 1);
+		intel_de_write(display, PIPEDMC_DCB_MAX_INCREASE(pipe),
+			       crtc_state->vrr.dc_balance.max_increase);
+		intel_de_write(display, PIPEDMC_DCB_MAX_DECREASE(pipe),
+			       crtc_state->vrr.dc_balance.max_decrease);
+		intel_de_write(display, PIPEDMC_DCB_GUARDBAND(pipe),
+			       crtc_state->vrr.dc_balance.guardband);
+		intel_de_write(display, PIPEDMC_DCB_SLOPE(pipe),
+			       crtc_state->vrr.dc_balance.slope);
+		intel_de_write(display, PIPEDMC_DCB_VBLANK(pipe),
+			       crtc_state->vrr.dc_balance.vblank_target);
+	}
+
 	intel_vrr_set_fixed_rr_timings(crtc_state);
 
 	if (!intel_vrr_always_use_vrr_tg(display) && !crtc_state->vrr.enable)
-- 
2.48.1