[PATCH v10 08/17] drm/i915/vrr: Add function to reset DC balance accumulated params

[Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>]

Add function which resets all accumulated DC Balance parameters
whenever adaptive mode of VRR goes off. This helps to give a
fresh start when VRR is re-enabled.

--v2:
- Typo, change crtc_state to old_crtc_state. (Ankit)

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c |  1 +
 drivers/gpu/drm/i915/display/intel_vrr.c     | 13 +++++++++++++
 drivers/gpu/drm/i915/display/intel_vrr.h     |  3 +++
 3 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 0a16c37b1dc6..798cb10ea3a1 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -1158,6 +1158,7 @@ static void intel_pre_plane_update(struct intel_atomic_state *state,
 
 	if (intel_crtc_vrr_disabling(state, crtc)) {
 		intel_vrr_disable(old_crtc_state);
+		intel_vrr_dcb_reset(old_crtc_state, crtc);
 		intel_crtc_update_active_timings(old_crtc_state, false);
 	}
 
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 74ad661f2654..637e4144cbea 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -646,6 +646,19 @@ void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
 			       EMP_AS_SDP_DB_TL(crtc_state->vrr.vsync_start));
 }
 
+void
+intel_vrr_dcb_reset(const struct intel_crtc_state *old_crtc_state,
+		    struct intel_crtc *crtc)
+{
+	struct intel_display *display = to_intel_display(old_crtc_state);
+	enum pipe pipe = crtc->pipe;
+
+	if (!old_crtc_state->vrr.dc_balance.enable)
+		return;
+
+	intel_de_write(display, PIPEDMC_DCB_BALANCE_RESET(pipe), 0);
+}
+
 void intel_vrr_send_push(struct intel_dsb *dsb,
 			 const struct intel_crtc_state *crtc_state)
 {
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.h b/drivers/gpu/drm/i915/display/intel_vrr.h
index 66fb9ad846f2..d40ed5504180 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.h
+++ b/drivers/gpu/drm/i915/display/intel_vrr.h
@@ -11,6 +11,7 @@
 struct drm_connector_state;
 struct intel_atomic_state;
 struct intel_connector;
+struct intel_crtc;
 struct intel_crtc_state;
 struct intel_dsb;
 struct intel_display;
@@ -39,6 +40,8 @@ bool intel_vrr_is_fixed_rr(const struct intel_crtc_state *crtc_state);
 void intel_vrr_transcoder_enable(const struct intel_crtc_state *crtc_state);
 void intel_vrr_transcoder_disable(const struct intel_crtc_state *crtc_state);
 void intel_vrr_set_fixed_rr_timings(const struct intel_crtc_state *crtc_state);
+void intel_vrr_dcb_reset(const struct intel_crtc_state *old_crtc_state,
+			 struct intel_crtc *crtc);
 bool intel_vrr_always_use_vrr_tg(struct intel_display *display);
 int intel_vrr_safe_window_start(const struct intel_crtc_state *crtc_state);
 int intel_vrr_vmin_safe_window_end(const struct intel_crtc_state *crtc_state);
-- 
2.48.1