drm/i915: Precompute HDMI infoframes

Store the infoframes in the crtc state and precompute them in
.compute_config(). While precomputing we'll also fill out the
inforames.enable bitmask appropriately.

v2: Drop the null packet stuff (Daniel)
    Add a FIXME for lspcon
v3: .compute_config() now returns int
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190225174106.2163-5-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/intel_drv.h

@@ -1033,6 +1033,10 @@ struct intel_crtc_state {
 
 	struct {
 		u32 enable;
+		u32 gcp;
+		union hdmi_infoframe avi;
+		union hdmi_infoframe spd;
+		union hdmi_infoframe hdmi;
 	} infoframes;
 
 	/* HDMI scrambling status */
@@ -2090,6 +2094,7 @@ void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
 void intel_infoframe_init(struct intel_digital_port *intel_dig_port);
 u32 intel_hdmi_infoframes_enabled(struct intel_encoder *encoder,
 				  const struct intel_crtc_state *crtc_state);
+u32 intel_hdmi_infoframe_enable(unsigned int type);
 
 /* intel_lvds.c */
 bool intel_lvds_port_enabled(struct drm_i915_private *dev_priv,

drivers/gpu/drm/i915/intel_lspcon.c

@@ -470,6 +470,8 @@ void lspcon_set_infoframes(struct intel_encoder *encoder,
 		return;
 	}
 
+	/* FIXME precompute infoframes */
+
 	ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
 						       conn_state->connector,
 						       adjusted_mode);