[PATCH v16 2/7] drm/i915: Move dbuf slice update to proper place

[Stanislav Lisovskiy]

Current DBuf slices update wasn't done in proper
place, especially its "post" part, which should
disable those only once vblank had passed and
all other changes are committed.

v2: Fix to use dev_priv and intel_atomic_state
    instead of skl_ddb_values
    (to be nuked in Villes patch)

v3: Renamed "enabled_slices" to "enabled_dbuf_slices_num"
    (Matt Roper)

v4: - Rebase against drm-tip.
    - Move post_update closer to optimize_watermarks,
      to prevent unneeded noise from underrun reporting
      (Ville Syrjälä)

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 37 +++++++++++++++-----
 1 file changed, 28 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index ae0e932962ee..66016c641cdd 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -15094,13 +15094,33 @@ static void intel_update_trans_port_sync_crtcs(struct intel_crtc *crtc,
 				       state);
 }
 
+static void icl_dbuf_slice_pre_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	u8 hw_enabled_slices = dev_priv->enabled_dbuf_slices_num;
+	u8 required_slices = state->enabled_dbuf_slices_num;
+
+	/* If 2nd DBuf slice required, enable it here */
+	if (INTEL_GEN(dev_priv) >= 11 && required_slices > hw_enabled_slices)
+		icl_dbuf_slices_update(dev_priv, required_slices);
+}
+
+static void icl_dbuf_slice_post_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	u8 hw_enabled_slices = dev_priv->enabled_dbuf_slices_num;
+	u8 required_slices = state->enabled_dbuf_slices_num;
+
+	/* If 2nd DBuf slice is no more required disable it */
+	if (INTEL_GEN(dev_priv) >= 11 && required_slices < hw_enabled_slices)
+		icl_dbuf_slices_update(dev_priv, required_slices);
+}
+
 static void skl_commit_modeset_enables(struct intel_atomic_state *state)
 {
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
 	struct intel_crtc *crtc;
 	struct intel_crtc_state *old_crtc_state, *new_crtc_state;
-	u8 hw_enabled_slices = dev_priv->enabled_dbuf_slices_num;
-	u8 required_slices = state->enabled_dbuf_slices_num;
 	struct skl_ddb_entry entries[I915_MAX_PIPES] = {};
 	const u8 num_pipes = INTEL_NUM_PIPES(dev_priv);
 	u8 update_pipes = 0, modeset_pipes = 0;
@@ -15121,10 +15141,6 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
 		}
 	}
 
-	/* If 2nd DBuf slice required, enable it here */
-	if (INTEL_GEN(dev_priv) >= 11 && required_slices > hw_enabled_slices)
-		icl_dbuf_slices_update(dev_priv, required_slices);
-
 	/*
 	 * Whenever the number of active pipes changes, we need to make sure we
 	 * update the pipes in the right order so that their ddb allocations
@@ -15226,9 +15242,6 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
 
 	WARN_ON(modeset_pipes);
 
-	/* If 2nd DBuf slice is no more required disable it */
-	if (INTEL_GEN(dev_priv) >= 11 && required_slices < hw_enabled_slices)
-		icl_dbuf_slices_update(dev_priv, required_slices);
 }
 
 static void intel_atomic_helper_free_state(struct drm_i915_private *dev_priv)
@@ -15358,6 +15371,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 	if (state->modeset)
 		intel_encoders_update_prepare(state);
 
+	/* Enable all new slices, we might need */
+	icl_dbuf_slice_pre_update(state);
+
 	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
 	dev_priv->display.commit_modeset_enables(state);
 
@@ -15414,6 +15430,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 			dev_priv->display.optimize_watermarks(state, crtc);
 	}
 
+	/* Disable all slices, we don't need */
+	icl_dbuf_slice_post_update(state);
+
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
 		intel_post_plane_update(state, crtc);
 
-- 
2.24.1.485.gad05a3d8e5