[PATCH v6 16/18] drm/i915/display: Add function to configure PIPEDMC_EVT_CTL

[Mitul Golani]

Configure PIPEDMC_EVT_CTL_3 register with required event flags.

--v2:
- Initialize with redundant flags. (Ankit)

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dmc.c | 17 +++++++++++++++++
 drivers/gpu/drm/i915/display/intel_dmc.h |  2 ++
 drivers/gpu/drm/i915/display/intel_vrr.c |  8 ++++++--
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
index 873dbbda7882..dbfff9018220 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -619,6 +619,23 @@ void intel_dmc_block_pkgc(struct intel_display *display, enum pipe pipe,
 		     PIPEDMC_BLOCK_PKGC_SW_BLOCK_PKGC_ALWAYS : 0);
 }
 
+void intel_dmc_configure_dc_balance_ctl_regs(struct intel_display *display,
+					     enum pipe pipe, bool enable)
+{
+	u32 val = REG_FIELD_PREP(DMC_EVT_CTL_TYPE_MASK,
+				 DMC_EVT_CTL_TYPE_EDGE_0_1);
+
+	if (enable)
+		val |= DMC_EVT_CTL_ENABLE | DMC_EVT_CTL_RECURRING |
+			REG_FIELD_PREP(DMC_EVT_CTL_EVENT_ID_MASK,
+				       PIPEDMC_EVENT_ADAPTIVE_DCB_TRIGGER);
+	else
+		val |= REG_FIELD_PREP(DMC_EVT_CTL_EVENT_ID_MASK,
+				      DMC_EVENT_FALSE);
+
+	intel_de_write(display, PIPEDMC_EVT_CTL_3(pipe), val);
+}
+
 /**
  * intel_dmc_start_pkgc_exit_at_start_of_undelayed_vblank() - start of PKG
  * C-state exit
diff --git a/drivers/gpu/drm/i915/display/intel_dmc.h b/drivers/gpu/drm/i915/display/intel_dmc.h
index 12912e80bbc6..e7a46e00caf1 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc.h
+++ b/drivers/gpu/drm/i915/display/intel_dmc.h
@@ -22,6 +22,8 @@ void intel_dmc_enable_pipe(struct intel_display *display, enum pipe pipe);
 void intel_dmc_disable_pipe(struct intel_display *display, enum pipe pipe);
 void intel_dmc_block_pkgc(struct intel_display *display, enum pipe pipe,
 			  bool block);
+void intel_dmc_configure_dc_balance_ctl_regs(struct intel_display *display,
+					     enum pipe pipe, bool enable);
 void intel_dmc_start_pkgc_exit_at_start_of_undelayed_vblank(struct intel_display *display,
 							    enum pipe pipe, bool enable);
 void intel_dmc_fini(struct intel_display *display);
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 5f0b6cb6fff0..a758ce58d154 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -687,8 +687,10 @@ void intel_vrr_enable(const struct intel_crtc_state *crtc_state)
 
 	intel_de_write(display, TRANS_VRR_CTL(display, cpu_transcoder), ctl);
 
-	if (crtc_state->vrr.dc_balance.enable)
+	if (crtc_state->vrr.dc_balance.enable) {
+		intel_dmc_configure_dc_balance_ctl_regs(display, pipe, true);
 		intel_pipedmc_dcb_enable(NULL, crtc);
+	}
 }
 
 void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state)
@@ -702,8 +704,10 @@ void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state)
 	if (!old_crtc_state->vrr.enable)
 		return;
 
-	if (old_crtc_state->vrr.dc_balance.enable)
+	if (old_crtc_state->vrr.dc_balance.enable) {
 		intel_pipedmc_dcb_disable(NULL, crtc);
+		intel_dmc_configure_dc_balance_ctl_regs(display, pipe, false);
+	}
 
 	ctl = trans_vrr_ctl(old_crtc_state);
 	if (intel_vrr_always_use_vrr_tg(display))
-- 
2.48.1