drm/i915: Add output_types bitmask into the crtc state

Rather than looping through encoders to see which encoder types
are being driven by the pipe, add an output_types bitmask into
the crtc state and populate it prior to compute_config and during
state readout.

v2: Determine output_types before .compute_config() hooks are called
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1466621833-5054-4-git-send-email-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -535,14 +535,7 @@ needs_modeset(struct drm_crtc_state *state)
  */
 bool intel_pipe_has_type(struct intel_crtc *crtc, enum intel_output_type type)
 {
-	struct drm_device *dev = crtc->base.dev;
-	struct intel_encoder *encoder;
-
-	for_each_encoder_on_crtc(dev, &crtc->base, encoder)
-		if (encoder->type == type)
-			return true;
-
-	return false;
+	return crtc->config->output_types & (1 << type);
 }
 
 /**
@@ -552,28 +545,9 @@ bool intel_pipe_has_type(struct intel_crtc *crtc, enum intel_output_type type)
  * encoder->crtc.
  */
 static bool intel_pipe_will_have_type(const struct intel_crtc_state *crtc_state,
-				      int type)
+				      enum intel_output_type type)
 {
-	struct drm_atomic_state *state = crtc_state->base.state;
-	struct drm_connector *connector;
-	struct drm_connector_state *connector_state;
-	struct intel_encoder *encoder;
-	int i, num_connectors = 0;
-
-	for_each_connector_in_state(state, connector, connector_state, i) {
-		if (connector_state->crtc != crtc_state->base.crtc)
-			continue;
-
-		num_connectors++;
-
-		encoder = to_intel_encoder(connector_state->best_encoder);
-		if (encoder->type == type)
-			return true;
-	}
-
-	WARN_ON(num_connectors == 0);
-
-	return false;
+	return crtc_state->output_types & (1 << type);
 }
 
 /*
@@ -12544,6 +12518,19 @@ intel_modeset_pipe_config(struct drm_crtc *crtc,
 			       &pipe_config->pipe_src_w,
 			       &pipe_config->pipe_src_h);
 
+	for_each_connector_in_state(state, connector, connector_state, i) {
+		if (connector_state->crtc != crtc)
+			continue;
+
+		encoder = to_intel_encoder(connector_state->best_encoder);
+
+		/*
+		 * Determine output_types before calling the .compute_config()
+		 * hooks so that the hooks can use this information safely.
+		 */
+		pipe_config->output_types |= 1 << encoder->type;
+	}
+
 encoder_retry:
 	/* Ensure the port clock defaults are reset when retrying. */
 	pipe_config->port_clock = 0;
@@ -12842,6 +12829,7 @@ intel_pipe_config_compare(struct drm_device *dev,
 		PIPE_CONF_CHECK_M_N_ALT(dp_m_n, dp_m2_n2);
 
 	PIPE_CONF_CHECK_I(has_dsi_encoder);
+	PIPE_CONF_CHECK_X(output_types);
 
 	PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_hdisplay);
 	PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_htotal);
@@ -13109,9 +13097,11 @@ verify_crtc_state(struct drm_crtc *crtc,
 				"Encoder connected to wrong pipe %c\n",
 				pipe_name(pipe));
 
-		if (active)
+		if (active) {
+			pipe_config->output_types |= 1 << encoder->type;
 			encoder->get_config(encoder, pipe_config);
 		}
+	}
 
 	if (!new_crtc_state->active)
 		return;
@@ -16075,6 +16065,7 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
 		if (encoder->get_hw_state(encoder, &pipe)) {
 			crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
 			encoder->base.crtc = &crtc->base;
+			crtc->config->output_types |= 1 << encoder->type;
 			encoder->get_config(encoder, crtc->config);
 		} else {
 			encoder->base.crtc = NULL;

drivers/gpu/drm/i915/intel_drv.h

@@ -529,6 +529,11 @@ struct intel_crtc_state {
 	/* DSI has special cases */
 	bool has_dsi_encoder;
 
+	/* Bitmask of encoder types (enum intel_output_type)
+	 * driven by the pipe.
+	 */
+	unsigned int output_types;
+
 	/* Whether we should send NULL infoframes. Required for audio. */
 	bool has_hdmi_sink;