[PATCH v6 18/18] drm/i915/vrr: Enable DC Balance bit

[Mitul Golani]

Enable DC Balance from vrr compute config and also add
enable/disable frame counters for DC Balance odd and even
frame count calculation.

--v2:
Update commit message

--v3:
- Driver should not control adjustment enable bit, as that
is already being controlled by firmware. Release bit from
driver computation.
- Commit message update.

--v4:
- Configure PIPEDMC_EVT_CTL enable/disable call.

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 | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index c7d376007a8d..c8680639f949 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -277,6 +277,9 @@ void intel_vrr_compute_vrr_timings(struct intel_crtc_state *crtc_state)
 {
 	crtc_state->vrr.enable = true;
 	crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
+
+	if (intel_vrr_dc_balance_possible(crtc_state))
+		crtc_state->vrr.dc_balance.enable = true;
 }
 
 /*
@@ -686,6 +689,8 @@ 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) {
+		intel_de_write(display, TRANS_ADAPTIVE_SYNC_DCB_CTL(cpu_transcoder),
+			       ADAPTIVE_SYNC_COUNTER_EN);
 		intel_dmc_configure_dc_balance_ctl_regs(display, pipe, true);
 		intel_de_write(display, TRANS_VRR_DCB_ADJ_FLIPLINE_CFG(cpu_transcoder),
 			       VRR_DCB_ADJ_FLIPLINE(crtc_state->vrr.flipline - 1));
@@ -707,6 +712,7 @@ void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state)
 	if (old_crtc_state->vrr.dc_balance.enable) {
 		intel_pipedmc_dcb_disable(NULL, crtc);
 		intel_dmc_configure_dc_balance_ctl_regs(display, pipe, false);
+		intel_de_write(display, TRANS_ADAPTIVE_SYNC_DCB_CTL(cpu_transcoder), 0);
 	}
 
 	ctl = trans_vrr_ctl(old_crtc_state);
-- 
2.48.1