drm/i915/display: add I915 conditional build to hsw_ips.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/04469b92be51b8394d74a508174f041aa7e011e8.1694514689.git.jani.nikula@intel.com

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

@@ -12,6 +12,7 @@ struct intel_atomic_state;
 struct intel_crtc;
 struct intel_crtc_state;
 
+#ifdef I915
 bool hsw_ips_disable(const struct intel_crtc_state *crtc_state);
 bool hsw_ips_pre_update(struct intel_atomic_state *state,
 			struct intel_crtc *crtc);
@@ -23,5 +24,39 @@ int hsw_ips_compute_config(struct intel_atomic_state *state,
 			   struct intel_crtc *crtc);
 void hsw_ips_get_config(struct intel_crtc_state *crtc_state);
 void hsw_ips_crtc_debugfs_add(struct intel_crtc *crtc);
+#else
+static inline bool hsw_ips_disable(const struct intel_crtc_state *crtc_state)
+{
+	return false;
+}
+static inline bool hsw_ips_pre_update(struct intel_atomic_state *state,
+				      struct intel_crtc *crtc)
+{
+	return false;
+}
+static inline void hsw_ips_post_update(struct intel_atomic_state *state,
+				       struct intel_crtc *crtc)
+{
+}
+static inline bool hsw_crtc_supports_ips(struct intel_crtc *crtc)
+{
+	return false;
+}
+static inline bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state)
+{
+	return false;
+}
+static inline int hsw_ips_compute_config(struct intel_atomic_state *state,
+					 struct intel_crtc *crtc)
+{
+	return 0;
+}
+static inline void hsw_ips_get_config(struct intel_crtc_state *crtc_state)
+{
+}
+static inline void hsw_ips_crtc_debugfs_add(struct intel_crtc *crtc)
+{
+}
+#endif
 
 #endif /* __HSW_IPS_H__ */