drm/i915/display: add I915 conditional build to intel_pch_display.h

Add stubs for !I915.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/02de0089de58c9fb19b6b56121f6c917f51b4561.1694514689.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_pch_display.h

@@ -15,6 +15,7 @@ struct intel_crtc;
 struct intel_crtc_state;
 struct intel_link_m_n;
 
+#ifdef I915
 bool intel_has_pch_trancoder(struct drm_i915_private *i915,
 			     enum pipe pch_transcoder);
 enum pipe intel_crtc_pch_transcoder(struct intel_crtc *crtc);
@@ -41,5 +42,57 @@ void intel_pch_transcoder_get_m2_n2(struct intel_crtc *crtc,
 				    struct intel_link_m_n *m_n);
 
 void intel_pch_sanitize(struct drm_i915_private *i915);
+#else
+static inline bool intel_has_pch_trancoder(struct drm_i915_private *i915,
+					   enum pipe pch_transcoder)
+{
+	return false;
+}
+static inline int intel_crtc_pch_transcoder(struct intel_crtc *crtc)
+{
+	return 0;
+}
+static inline void ilk_pch_pre_enable(struct intel_atomic_state *state,
+				      struct intel_crtc *crtc)
+{
+}
+static inline void ilk_pch_enable(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+}
+static inline void ilk_pch_disable(struct intel_atomic_state *state,
+				   struct intel_crtc *crtc)
+{
+}
+static inline void ilk_pch_post_disable(struct intel_atomic_state *state,
+					struct intel_crtc *crtc)
+{
+}
+static inline void ilk_pch_get_config(struct intel_crtc_state *crtc_state)
+{
+}
+static inline void lpt_pch_enable(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+}
+static inline void lpt_pch_disable(struct intel_atomic_state *state,
+				   struct intel_crtc *crtc)
+{
+}
+static inline void lpt_pch_get_config(struct intel_crtc_state *crtc_state)
+{
+}
+static inline void intel_pch_transcoder_get_m1_n1(struct intel_crtc *crtc,
+						  struct intel_link_m_n *m_n)
+{
+}
+static inline void intel_pch_transcoder_get_m2_n2(struct intel_crtc *crtc,
+						  struct intel_link_m_n *m_n)
+{
+}
+static inline void intel_pch_sanitize(struct drm_i915_private *i915)
+{
+}
+#endif
 
 #endif