drm/i915: Reduce INTEL_DISPLAY_ENABLED to just treat outputs as disconnected

Since the display hardware is all there even when INTEL_DISPLAY_ENABLED
return false we have to be capable of shutting it down cleanly so
as to not anger the hw. To that end let's reduce the effect of
!INTEL_DISPLAY_ENABLE to just treating all outputs as disconnected.
Should prevent anyone from automagically enabling any of them, while
still allowing us to cleanly shut them down.

v2: Put the check into the right place for CRT

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200910164256.25983-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -1646,6 +1646,7 @@ static const struct drm_encoder_funcs gen11_dsi_encoder_funcs = {
 };
 
 static const struct drm_connector_funcs gen11_dsi_connector_funcs = {
+	.detect = intel_panel_detect,
 	.late_register = intel_connector_register,
 	.early_unregister = intel_connector_unregister,
 	.destroy = intel_connector_destroy,

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

@@ -833,6 +833,9 @@ intel_crt_detect(struct drm_connector *connector,
 		    connector->base.id, connector->name,
 		    force);
 
+	if (!INTEL_DISPLAY_ENABLED(dev_priv))
+		return connector_status_disconnected;
+
 	if (dev_priv->params.load_detect_test) {
 		wakeref = intel_display_power_get(dev_priv,
 						  intel_encoder->power_domain);

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

@@ -16893,7 +16893,7 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
 
 	intel_pps_init(dev_priv);
 
-	if (!HAS_DISPLAY(dev_priv) || !INTEL_DISPLAY_ENABLED(dev_priv))
+	if (!HAS_DISPLAY(dev_priv))
 		return;
 
 	if (IS_ROCKETLAKE(dev_priv)) {

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

@@ -6103,6 +6103,9 @@ intel_dp_detect(struct drm_connector *connector,
 	drm_WARN_ON(&dev_priv->drm,
 		    !drm_modeset_is_locked(&dev_priv->drm.mode_config.connection_mutex));
 
+	if (!INTEL_DISPLAY_ENABLED(dev_priv))
+		return connector_status_disconnected;
+
 	/* Can't disconnect eDP */
 	if (intel_dp_is_edp(intel_dp))
 		status = edp_detect(intel_dp);

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

@@ -719,9 +719,13 @@ static int
 intel_dp_mst_detect(struct drm_connector *connector,
 		    struct drm_modeset_acquire_ctx *ctx, bool force)
 {
+	struct drm_i915_private *i915 = to_i915(connector->dev);
 	struct intel_connector *intel_connector = to_intel_connector(connector);
 	struct intel_dp *intel_dp = intel_connector->mst_port;
 
+	if (!INTEL_DISPLAY_ENABLED(i915))
+		return connector_status_disconnected;
+
 	if (drm_connector_is_unregistered(connector))
 		return connector_status_disconnected;
 

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

@@ -313,9 +313,15 @@ static void intel_dvo_pre_enable(struct intel_atomic_state *state,
 static enum drm_connector_status
 intel_dvo_detect(struct drm_connector *connector, bool force)
 {
+	struct drm_i915_private *i915 = to_i915(connector->dev);
 	struct intel_dvo *intel_dvo = intel_attached_dvo(to_intel_connector(connector));
+
 	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 		      connector->base.id, connector->name);
+
+	if (!INTEL_DISPLAY_ENABLED(i915))
+		return connector_status_disconnected;
+
 	return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
 }
 

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

@@ -2673,6 +2673,9 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 	drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s]\n",
 		    connector->base.id, connector->name);
 
+	if (!INTEL_DISPLAY_ENABLED(dev_priv))
+		return connector_status_disconnected;
+
 	wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
 
 	if (INTEL_GEN(dev_priv) >= 11 &&

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

@@ -456,12 +456,6 @@ static int intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 	return 0;
 }
 
-static enum drm_connector_status
-intel_lvds_detect(struct drm_connector *connector, bool force)
-{
-	return connector_status_connected;
-}
-
 /*
  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
  */
@@ -490,7 +484,7 @@ static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs
 };
 
 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
-	.detect = intel_lvds_detect,
+	.detect = intel_panel_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.atomic_get_property = intel_digital_connector_atomic_get_property,
 	.atomic_set_property = intel_digital_connector_atomic_set_property,

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

@@ -2095,6 +2095,17 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
 	}
 }
 
+enum drm_connector_status
+intel_panel_detect(struct drm_connector *connector, bool force)
+{
+	struct drm_i915_private *i915 = to_i915(connector->dev);
+
+	if (!INTEL_DISPLAY_ENABLED(i915))
+		return connector_status_disconnected;
+
+	return connector_status_connected;
+}
+
 int intel_panel_init(struct intel_panel *panel,
 		     struct drm_display_mode *fixed_mode,
 		     struct drm_display_mode *downclock_mode)

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

@@ -23,6 +23,8 @@ int intel_panel_init(struct intel_panel *panel,
 		     struct drm_display_mode *fixed_mode,
 		     struct drm_display_mode *downclock_mode);
 void intel_panel_fini(struct intel_panel *panel);
+enum drm_connector_status
+intel_panel_detect(struct drm_connector *connector, bool force);
 void intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
 			    struct drm_display_mode *adjusted_mode);
 int intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,

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

@@ -2084,14 +2084,18 @@ intel_sdvo_connector_matches_edid(struct intel_sdvo_connector *sdvo,
 static enum drm_connector_status
 intel_sdvo_detect(struct drm_connector *connector, bool force)
 {
-	u16 response;
+	struct drm_i915_private *i915 = to_i915(connector->dev);
 	struct intel_sdvo *intel_sdvo = intel_attached_sdvo(to_intel_connector(connector));
 	struct intel_sdvo_connector *intel_sdvo_connector = to_intel_sdvo_connector(connector);
 	enum drm_connector_status ret;
+	u16 response;
 
 	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 		      connector->base.id, connector->name);
 
+	if (!INTEL_DISPLAY_ENABLED(i915))
+		return connector_status_disconnected;
+
 	if (!intel_sdvo_get_value(intel_sdvo,
 				  SDVO_CMD_GET_ATTACHED_DISPLAYS,
 				  &response, 2))

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

@@ -1706,6 +1706,9 @@ intel_tv_detect(struct drm_connector *connector,
 	drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] force=%d\n",
 		    connector->base.id, connector->name, force);
 
+	if (!INTEL_DISPLAY_ENABLED(i915))
+		return connector_status_disconnected;
+
 	if (force) {
 		struct intel_load_detect_pipe tmp;
 		int ret;

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

@@ -1585,6 +1585,7 @@ static const struct drm_connector_helper_funcs intel_dsi_connector_helper_funcs
 };
 
 static const struct drm_connector_funcs intel_dsi_connector_funcs = {
+	.detect = intel_panel_detect,
 	.late_register = intel_connector_register,
 	.early_unregister = intel_connector_unregister,
 	.destroy = intel_connector_destroy,