drm/i915/display/adlp: Fix programing of PIPE_MBUS_DBOX_CTL

PIPE_MBUS_DBOX_CTL was only being programmed when a pipe is being
enabled but that could potentially cause issues as it could have
mismatching values while pipes are being enabled.

So here moving the PIPE_MBUS_DBOX_CTL programming of all pipes to be
executed before the function that enables all pipes, leaving all pipes
with a matching A_CREDIT value.

While at it, also moving it to intel_pm.c as we are trying to reduce
the gigantic size of intel_display.c and intel_pm.c have other MBUS
programing sequences.

v2:
- do not program PIPE_MBUS_DBOX_CTL if pipe will not be active or
when it do not needs modeset
- remove the checks to wait a vblank

v3:
- checking if dbuf state is present in state before using it

v4:
- removing redundant checks
- calling intel_atomic_get_new_dbuf_state instead of
intel_atomic_get_dbuf_state

BSpec: 49213
BSpec: 50343
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220330155724.255226-3-jose.souza@intel.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -1826,39 +1826,6 @@ static void glk_pipe_scaler_clock_gating_wa(struct drm_i915_private *dev_priv,
 	intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe), val);
 }
 
-static void icl_pipe_mbus_enable(struct intel_crtc *crtc, bool joined_mbus)
-{
-	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-	enum pipe pipe = crtc->pipe;
-	u32 val = 0;
-
-	if (DISPLAY_VER(dev_priv) >= 12) {
-		val |= MBUS_DBOX_B2B_TRANSACTIONS_MAX(16);
-		val |= MBUS_DBOX_B2B_TRANSACTIONS_DELAY(1);
-		val |= MBUS_DBOX_REGULATE_B2B_TRANSACTIONS_EN;
-	}
-
-	/* Wa_22010947358:adl-p */
-	if (IS_ALDERLAKE_P(dev_priv))
-		val |= joined_mbus ? MBUS_DBOX_A_CREDIT(6) :
-				     MBUS_DBOX_A_CREDIT(4);
-	else
-		val |= MBUS_DBOX_A_CREDIT(2);
-
-	if (IS_ALDERLAKE_P(dev_priv)) {
-		val |= MBUS_DBOX_BW_CREDIT(2);
-		val |= MBUS_DBOX_B_CREDIT(8);
-	} else if (DISPLAY_VER(dev_priv) >= 12) {
-		val |= MBUS_DBOX_BW_CREDIT(2);
-		val |= MBUS_DBOX_B_CREDIT(12);
-	} else {
-		val |= MBUS_DBOX_BW_CREDIT(1);
-		val |= MBUS_DBOX_B_CREDIT(8);
-	}
-
-	intel_de_write(dev_priv, PIPE_MBUS_DBOX_CTL(pipe), val);
-}
-
 static void hsw_set_linetime_wm(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -1995,13 +1962,6 @@ static void hsw_crtc_enable(struct intel_atomic_state *state,
 
 	intel_initial_watermarks(state, crtc);
 
-	if (DISPLAY_VER(dev_priv) >= 11) {
-		const struct intel_dbuf_state *dbuf_state =
-				intel_atomic_get_new_dbuf_state(state);
-
-		icl_pipe_mbus_enable(crtc, dbuf_state->joined_mbus);
-	}
-
 	if (intel_crtc_is_bigjoiner_slave(new_crtc_state))
 		intel_crtc_vblank_on(new_crtc_state);
 
@@ -8600,6 +8560,7 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 	intel_encoders_update_prepare(state);
 
 	intel_dbuf_pre_plane_update(state);
+	intel_mbus_dbox_update(state);
 
 	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
 		if (new_crtc_state->do_async_flip)

drivers/gpu/drm/i915/intel_pm.c

@@ -8258,3 +8258,55 @@ void intel_dbuf_post_plane_update(struct intel_atomic_state *state)
 	gen9_dbuf_slices_update(dev_priv,
 				new_dbuf_state->enabled_slices);
 }
+
+void intel_mbus_dbox_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_dbuf_state *new_dbuf_state, *old_dbuf_state;
+	const struct intel_crtc_state *new_crtc_state;
+	const struct intel_crtc *crtc;
+	u32 val = 0;
+	int i;
+
+	if (DISPLAY_VER(i915) < 11)
+		return;
+
+	new_dbuf_state = intel_atomic_get_new_dbuf_state(state);
+	old_dbuf_state = intel_atomic_get_old_dbuf_state(state);
+	if (!new_dbuf_state ||
+	    (new_dbuf_state->joined_mbus == old_dbuf_state->joined_mbus &&
+	     new_dbuf_state->active_pipes == old_dbuf_state->active_pipes))
+		return;
+
+	if (DISPLAY_VER(i915) >= 12) {
+		val |= MBUS_DBOX_B2B_TRANSACTIONS_MAX(16);
+		val |= MBUS_DBOX_B2B_TRANSACTIONS_DELAY(1);
+		val |= MBUS_DBOX_REGULATE_B2B_TRANSACTIONS_EN;
+	}
+
+	/* Wa_22010947358:adl-p */
+	if (IS_ALDERLAKE_P(i915))
+		val |= new_dbuf_state->joined_mbus ? MBUS_DBOX_A_CREDIT(6) :
+						     MBUS_DBOX_A_CREDIT(4);
+	else
+		val |= MBUS_DBOX_A_CREDIT(2);
+
+	if (IS_ALDERLAKE_P(i915)) {
+		val |= MBUS_DBOX_BW_CREDIT(2);
+		val |= MBUS_DBOX_B_CREDIT(8);
+	} else if (DISPLAY_VER(i915) >= 12) {
+		val |= MBUS_DBOX_BW_CREDIT(2);
+		val |= MBUS_DBOX_B_CREDIT(12);
+	} else {
+		val |= MBUS_DBOX_BW_CREDIT(1);
+		val |= MBUS_DBOX_B_CREDIT(8);
+	}
+
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		if (!new_crtc_state->hw.active ||
+		    !intel_crtc_needs_modeset(new_crtc_state))
+			continue;
+
+		intel_de_write(i915, PIPE_MBUS_DBOX_CTL(crtc->pipe), val);
+	}
+}

drivers/gpu/drm/i915/intel_pm.h

@@ -94,5 +94,6 @@ intel_atomic_get_dbuf_state(struct intel_atomic_state *state);
 int intel_dbuf_init(struct drm_i915_private *dev_priv);
 void intel_dbuf_pre_plane_update(struct intel_atomic_state *state);
 void intel_dbuf_post_plane_update(struct intel_atomic_state *state);
+void intel_mbus_dbox_update(struct intel_atomic_state *state);
 
 #endif /* __INTEL_PM_H__ */