drm/i915: Relocate intel_mbus_dbox_update()

intel_mbus_dbox_update() will become static soon. Relocate it
into a place that avoids having to add a forward declaration
for it.
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240402155016.13733-7-ville.syrjala@linux.intel.com

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

@@ -3540,6 +3540,89 @@ int intel_dbuf_init(struct drm_i915_private *i915)
 	return 0;
 }
 
+static bool xelpdp_is_only_pipe_per_dbuf_bank(enum pipe pipe, u8 active_pipes)
+{
+	switch (pipe) {
+	case PIPE_A:
+		return !(active_pipes & BIT(PIPE_D));
+	case PIPE_D:
+		return !(active_pipes & BIT(PIPE_A));
+	case PIPE_B:
+		return !(active_pipes & BIT(PIPE_C));
+	case PIPE_C:
+		return !(active_pipes & BIT(PIPE_B));
+	default: /* to suppress compiler warning */
+		MISSING_CASE(pipe);
+		break;
+	}
+
+	return false;
+}
+
+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 *crtc;
+	u32 val = 0;
+
+	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) >= 14)
+		val |= MBUS_DBOX_I_CREDIT(2);
+
+	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;
+	}
+
+	if (DISPLAY_VER(i915) >= 14)
+		val |= new_dbuf_state->joined_mbus ? MBUS_DBOX_A_CREDIT(12) :
+						     MBUS_DBOX_A_CREDIT(8);
+	else if (IS_ALDERLAKE_P(i915))
+		/* Wa_22010947358:adl-p */
+		val |= new_dbuf_state->joined_mbus ? MBUS_DBOX_A_CREDIT(6) :
+						     MBUS_DBOX_A_CREDIT(4);
+	else
+		val |= MBUS_DBOX_A_CREDIT(2);
+
+	if (DISPLAY_VER(i915) >= 14) {
+		val |= MBUS_DBOX_B_CREDIT(0xA);
+	} else 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_intel_crtc_in_pipe_mask(&i915->drm, crtc, new_dbuf_state->active_pipes) {
+		u32 pipe_val = val;
+
+		if (DISPLAY_VER(i915) >= 14) {
+			if (xelpdp_is_only_pipe_per_dbuf_bank(crtc->pipe,
+							      new_dbuf_state->active_pipes))
+				pipe_val |= MBUS_DBOX_BW_8CREDITS_MTL;
+			else
+				pipe_val |= MBUS_DBOX_BW_4CREDITS_MTL;
+		}
+
+		intel_de_write(i915, PIPE_MBUS_DBOX_CTL(crtc->pipe), pipe_val);
+	}
+}
+
 int intel_dbuf_state_set_mdclk_cdclk_ratio(struct intel_atomic_state *state, u8 ratio)
 {
 	struct intel_dbuf_state *dbuf_state;
@@ -3657,89 +3740,6 @@ void intel_dbuf_post_plane_update(struct intel_atomic_state *state)
 				new_dbuf_state->enabled_slices);
 }
 
-static bool xelpdp_is_only_pipe_per_dbuf_bank(enum pipe pipe, u8 active_pipes)
-{
-	switch (pipe) {
-	case PIPE_A:
-		return !(active_pipes & BIT(PIPE_D));
-	case PIPE_D:
-		return !(active_pipes & BIT(PIPE_A));
-	case PIPE_B:
-		return !(active_pipes & BIT(PIPE_C));
-	case PIPE_C:
-		return !(active_pipes & BIT(PIPE_B));
-	default: /* to suppress compiler warning */
-		MISSING_CASE(pipe);
-		break;
-	}
-
-	return false;
-}
-
-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 *crtc;
-	u32 val = 0;
-
-	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) >= 14)
-		val |= MBUS_DBOX_I_CREDIT(2);
-
-	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;
-	}
-
-	if (DISPLAY_VER(i915) >= 14)
-		val |= new_dbuf_state->joined_mbus ? MBUS_DBOX_A_CREDIT(12) :
-						     MBUS_DBOX_A_CREDIT(8);
-	else if (IS_ALDERLAKE_P(i915))
-		/* Wa_22010947358:adl-p */
-		val |= new_dbuf_state->joined_mbus ? MBUS_DBOX_A_CREDIT(6) :
-						     MBUS_DBOX_A_CREDIT(4);
-	else
-		val |= MBUS_DBOX_A_CREDIT(2);
-
-	if (DISPLAY_VER(i915) >= 14) {
-		val |= MBUS_DBOX_B_CREDIT(0xA);
-	} else 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_intel_crtc_in_pipe_mask(&i915->drm, crtc, new_dbuf_state->active_pipes) {
-		u32 pipe_val = val;
-
-		if (DISPLAY_VER(i915) >= 14) {
-			if (xelpdp_is_only_pipe_per_dbuf_bank(crtc->pipe,
-							      new_dbuf_state->active_pipes))
-				pipe_val |= MBUS_DBOX_BW_8CREDITS_MTL;
-			else
-				pipe_val |= MBUS_DBOX_BW_4CREDITS_MTL;
-		}
-
-		intel_de_write(i915, PIPE_MBUS_DBOX_CTL(crtc->pipe), pipe_val);
-	}
-}
-
 static int skl_watermark_ipc_status_show(struct seq_file *m, void *data)
 {
 	struct drm_i915_private *i915 = m->private;