[PATCH v11 18/18] drm/i915/vrr: Enable DC Balance

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

Enable DC Balance from vrr compute config and related hw flag.
Also to add pipe restrictions along with this.

--v2:
- Use dc balance check instead of source restriction.
--v3:
- Club pipe restriction check with dc balance enablement. (Ankit)
--v4:
- Separate out Pipe restrictions to patch#7

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/gpu/drm/i915/display/intel_vrr.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 1522ec3a98b8..db74744ddb31 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -399,6 +399,7 @@ intel_vrr_dc_balance_compute_config(struct intel_crtc_state *crtc_state)
 	crtc_state->vrr.dc_balance.vblank_target =
 		DIV_ROUND_UP((crtc_state->vrr.vmax - crtc_state->vrr.vmin) *
 			     DCB_BLANK_TARGET, 100);
+	crtc_state->vrr.dc_balance.enable = true;
 }
 
 void
@@ -789,6 +790,7 @@ intel_vrr_enable_dc_balancing(const struct intel_crtc_state *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;
+	u32 vrr_ctl = intel_de_read(display, TRANS_VRR_CTL(display, cpu_transcoder));
 
 	if (!crtc_state->vrr.dc_balance.enable)
 		return;
@@ -827,6 +829,9 @@ intel_vrr_enable_dc_balancing(const struct intel_crtc_state *crtc_state)
 	intel_de_write(display, TRANS_ADAPTIVE_SYNC_DCB_CTL(cpu_transcoder),
 		       ADAPTIVE_SYNC_COUNTER_EN);
 	intel_pipedmc_dcb_enable(NULL, crtc);
+
+	vrr_ctl |= VRR_CTL_DCB_ADJ_ENABLE;
+	intel_de_write(display, TRANS_VRR_CTL(display, cpu_transcoder), vrr_ctl);
 }
 
 static void
@@ -836,6 +841,7 @@ intel_vrr_disable_dc_balancing(const struct intel_crtc_state *old_crtc_state)
 	enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
 	struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
 	enum pipe pipe = crtc->pipe;
+	u32 vrr_ctl = intel_de_read(display, TRANS_VRR_CTL(display, cpu_transcoder));
 
 	if (!old_crtc_state->vrr.dc_balance.enable)
 		return;
@@ -858,6 +864,9 @@ intel_vrr_disable_dc_balancing(const struct intel_crtc_state *old_crtc_state)
 	intel_de_write(display, TRANS_VRR_DCB_ADJ_FLIPLINE_CFG(cpu_transcoder), 0);
 	intel_de_write(display, TRANS_VRR_DCB_VMAX(cpu_transcoder), 0);
 	intel_de_write(display, TRANS_VRR_DCB_FLIPLINE(cpu_transcoder), 0);
+
+	vrr_ctl &= ~VRR_CTL_DCB_ADJ_ENABLE;
+	intel_de_write(display, TRANS_VRR_CTL(display, cpu_transcoder), vrr_ctl);
 }
 
 static void intel_vrr_tg_enable(const struct intel_crtc_state *crtc_state,
-- 
2.48.1