drm: Use a nondestructive mode for output detect when polling (v2)

v2: Julien Cristau pointed out that @nondestructive results in
double-negatives and confusion when trying to interpret the parameter,
so use @force instead. Much easier to type as well. ;-)

And fix the miscompilation of vmgfx reported by Sedat Dilek.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_crtc_helper.c

@@ -103,7 +103,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 		if (connector->funcs->force)
 			connector->funcs->force(connector);
 	} else {
-		connector->status = connector->funcs->detect(connector, false);
+		connector->status = connector->funcs->detect(connector, true);
 		drm_kms_helper_poll_enable(dev);
 	}
 
@@ -866,7 +866,7 @@ static void output_poll_execute(struct work_struct *work)
 		    !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 			continue;
 
-		status = connector->funcs->detect(connector, true);
+		status = connector->funcs->detect(connector, false);
 		if (old_status != status)
 			changed = true;
 	}

drivers/gpu/drm/i915/intel_crt.c

@@ -401,8 +401,7 @@ intel_crt_load_detect(struct drm_crtc *crtc, struct intel_encoder *intel_encoder
 }
 
 static enum drm_connector_status
-intel_crt_detect(struct drm_connector *connector,
-		 bool nondestructive)
+intel_crt_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_device *dev = connector->dev;
 	struct drm_encoder *encoder = intel_attached_encoder(connector);
@@ -421,7 +420,7 @@ intel_crt_detect(struct drm_connector *connector,
 	if (intel_crt_detect_ddc(encoder))
 		return connector_status_connected;
 
-	if (nondestructive)
+	if (!force)
 		return connector->status;
 
 	/* for pre-945g platforms use load detect */

drivers/gpu/drm/i915/intel_dp.c

@@ -1386,8 +1386,7 @@ ironlake_dp_detect(struct drm_connector *connector)
  * \return false if DP port is disconnected.
  */
 static enum drm_connector_status
-intel_dp_detect(struct drm_connector *connector,
-		bool nondestructive)
+intel_dp_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_encoder *encoder = intel_attached_encoder(connector);
 	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

drivers/gpu/drm/i915/intel_dvo.c

@@ -222,8 +222,7 @@ static void intel_dvo_mode_set(struct drm_encoder *encoder,
  * Unimplemented.
  */
 static enum drm_connector_status
-intel_dvo_detect(struct drm_connector *connector,
-		 bool nondestructive)
+intel_dvo_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_encoder *encoder = intel_attached_encoder(connector);
 	struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);

drivers/gpu/drm/i915/intel_hdmi.c

@@ -139,8 +139,7 @@ static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
 }
 
 static enum drm_connector_status
-intel_hdmi_detect(struct drm_connector *connector,
-		  bool nondestructive)
+intel_hdmi_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_encoder *encoder = intel_attached_encoder(connector);
 	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);

drivers/gpu/drm/i915/intel_lvds.c

@@ -446,8 +446,7 @@ static void intel_lvds_mode_set(struct drm_encoder *encoder,
  * needed, using lid status notification from the input layer.
  */
 static enum drm_connector_status
-intel_lvds_detect(struct drm_connector *connector,
-		  bool nondestructive)
+intel_lvds_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_device *dev = connector->dev;
 	enum drm_connector_status status = connector_status_connected;
@@ -543,7 +542,7 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 	 */
 	if (connector)
 		connector->status = connector->funcs->detect(connector,
-							     true);
+							     false);
 
 	/* Don't force modeset on machines where it causes a GPU lockup */
 	if (dmi_check_system(intel_no_modeset_on_lid))

drivers/gpu/drm/i915/intel_sdvo.c

@@ -1417,7 +1417,7 @@ intel_analog_is_connected(struct drm_device *dev)
 	if (!analog_connector)
 		return false;
 
-	if (analog_connector->funcs->detect(analog_connector, true) ==
+	if (analog_connector->funcs->detect(analog_connector, false) ==
 			connector_status_disconnected)
 		return false;
 
@@ -1487,8 +1487,7 @@ intel_sdvo_hdmi_sink_detect(struct drm_connector *connector)
 }
 
 static enum drm_connector_status
-intel_sdvo_detect(struct drm_connector *connector,
-		  bool nondestructive)
+intel_sdvo_detect(struct drm_connector *connector, bool force)
 {
 	uint16_t response;
 	struct drm_encoder *encoder = intel_attached_encoder(connector);

drivers/gpu/drm/i915/intel_tv.c

@@ -1341,8 +1341,7 @@ static void intel_tv_find_better_format(struct drm_connector *connector)
  * we have a pipe programmed in order to probe the TV.
  */
 static enum drm_connector_status
-intel_tv_detect(struct drm_connector *connector,
-		bool nondestructive)
+intel_tv_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_display_mode mode;
 	struct drm_encoder *encoder = intel_attached_encoder(connector);
@@ -1354,7 +1353,7 @@ intel_tv_detect(struct drm_connector *connector,
 
 	if (encoder->crtc && encoder->crtc->enabled) {
 		type = intel_tv_detect_type(intel_tv);
-	} else if (nondestructive) {
+	} else if (force) {
 		struct drm_crtc *crtc;
 		int dpms_mode;
 

drivers/gpu/drm/nouveau/nouveau_connector.c

@@ -168,8 +168,7 @@ nouveau_connector_set_encoder(struct drm_connector *connector,
 }
 
 static enum drm_connector_status
-nouveau_connector_detect(struct drm_connector *connector,
-			 bool nondestructive)
+nouveau_connector_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_device *dev = connector->dev;
 	struct nouveau_connector *nv_connector = nouveau_connector(connector);
@@ -247,8 +246,7 @@ detect_analog:
 }
 
 static enum drm_connector_status
-nouveau_connector_detect_lvds(struct drm_connector *connector,
-			      bool nondestructive)
+nouveau_connector_detect_lvds(struct drm_connector *connector, bool force)
 {
 	struct drm_device *dev = connector->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
@@ -269,7 +267,7 @@ nouveau_connector_detect_lvds(struct drm_connector *connector,
 
 	/* Try retrieving EDID via DDC */
 	if (!dev_priv->vbios.fp_no_ddc) {
-		status = nouveau_connector_detect(connector, nondestructive);
+		status = nouveau_connector_detect(connector, force);
 		if (status == connector_status_connected)
 			goto out;
 	}

drivers/gpu/drm/radeon/radeon_connectors.c

@@ -482,8 +482,7 @@ static int radeon_lvds_mode_valid(struct drm_connector *connector,
 }
 
 static enum drm_connector_status
-radeon_lvds_detect(struct drm_connector *connector,
-		   bool nondestructive)
+radeon_lvds_detect(struct drm_connector *connector, bool force)
 {
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	struct drm_encoder *encoder = radeon_best_single_encoder(connector);
@@ -597,8 +596,7 @@ static int radeon_vga_mode_valid(struct drm_connector *connector,
 }
 
 static enum drm_connector_status
-radeon_vga_detect(struct drm_connector *connector,
-		  bool nondestructive)
+radeon_vga_detect(struct drm_connector *connector, bool force)
 {
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	struct drm_encoder *encoder;
@@ -696,8 +694,7 @@ static int radeon_tv_mode_valid(struct drm_connector *connector,
 }
 
 static enum drm_connector_status
-radeon_tv_detect(struct drm_connector *connector,
-		 bool nondestructive)
+radeon_tv_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_encoder *encoder;
 	struct drm_encoder_helper_funcs *encoder_funcs;
@@ -755,8 +752,7 @@ static int radeon_dvi_get_modes(struct drm_connector *connector)
  * if its shared we have to set the other connector to disconnected.
  */
 static enum drm_connector_status
-radeon_dvi_detect(struct drm_connector *connector,
-		  bool nondestructive)
+radeon_dvi_detect(struct drm_connector *connector, bool force)
 {
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	struct drm_encoder *encoder = NULL;
@@ -981,8 +977,7 @@ static int radeon_dp_get_modes(struct drm_connector *connector)
 }
 
 static enum drm_connector_status
-radeon_dp_detect(struct drm_connector *connector,
-		 bool nondestructive)
+radeon_dp_detect(struct drm_connector *connector, bool force)
 {
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	enum drm_connector_status ret = connector_status_disconnected;

drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c

@@ -336,7 +336,7 @@ static void vmw_ldu_connector_restore(struct drm_connector *connector)
 
 static enum drm_connector_status
 	vmw_ldu_connector_detect(struct drm_connector *connector,
-				 bool nondestructive)
+				 bool force)
 {
 	if (vmw_connector_to_ldu(connector)->pref_active)
 		return connector_status_connected;
@@ -517,7 +517,7 @@ static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
 
 	drm_connector_init(dev, connector, &vmw_legacy_connector_funcs,
 			   DRM_MODE_CONNECTOR_LVDS);
-	connector->status = vmw_ldu_connector_detect(connector);
+	connector->status = vmw_ldu_connector_detect(connector, true);
 
 	drm_encoder_init(dev, encoder, &vmw_legacy_encoder_funcs,
 			 DRM_MODE_ENCODER_LVDS);
@@ -611,7 +611,7 @@ int vmw_kms_ldu_update_layout(struct vmw_private *dev_priv, unsigned num,
 			ldu->pref_height = 600;
 			ldu->pref_active = false;
 		}
-		con->status = vmw_ldu_connector_detect(con);
+		con->status = vmw_ldu_connector_detect(con, true);
 	}
 
 	mutex_unlock(&dev->mode_config.mutex);

include/drm/drm_crtc.h

@@ -386,8 +386,15 @@ struct drm_connector_funcs {
 	void (*dpms)(struct drm_connector *connector, int mode);
 	void (*save)(struct drm_connector *connector);
 	void (*restore)(struct drm_connector *connector);
+
+	/* Check to see if anything is attached to the connector.
+	 * @force is set to false whilst polling, true when checking the
+	 * connector due to user request. @force can be used by the driver
+	 * to avoid expensive, destructive operations during automated
+	 * probing.
+	 */
 	enum drm_connector_status (*detect)(struct drm_connector *connector,
-					    bool nondestructive);
+					    bool force);
 	int (*fill_modes)(struct drm_connector *connector, uint32_t max_width, uint32_t max_height);
 	int (*set_property)(struct drm_connector *connector, struct drm_property *property,
 			     uint64_t val);