path: root/freed-ora/current/f14/drm-polling-fixes.patch

commit 879d56da9b89b52de2109cadf1369967522428e8
Author: Dave Airlie <airlied@redhat.com>
Date:   Tue Oct 26 12:55:52 2010 +1000

    drm/radeon/kms: don't poll dac load detect.
    
    This is slightly destructive, cpu intensive and can cause lockups.
    
    Signed-off-by: Dave Airlie <airlied@redhat.com>

commit 2563a90cdda1fe490947dc032ce17bf1118afc39
Author: Dave Airlie <airlied@redhat.com>
Date:   Tue Nov 9 10:26:00 2010 +1000

    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>
    
    Conflicts:
    
    	drivers/gpu/drm/i915/intel_tv.c
    	drivers/gpu/drm/nouveau/nouveau_connector.c

commit deb557bbbcaa7fa8281d51490c73b51f579bc84d
Author: Dave Airlie <airlied@redhat.com>
Date:   Tue Nov 9 10:24:06 2010 +1000

    drm: Use a nondestructive mode for output detect when polling
    
    Destructive load-detection is very expensive and due to failings
    elsewhere can trigger system wide stalls of up to 600ms. A simple
    first step to correcting this is not to invoke such an expensive
    and destructive load-detection operation automatically.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29536
    Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16265
    Reported-by: Bruno Prémont <bonbons@linux-vserver.org>
    Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Cc: stable@kernel.org
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    
    Conflicts:
    
    	drivers/gpu/drm/i915/intel_tv.c
    	drivers/gpu/drm/nouveau/nouveau_connector.c

commit 8d5d3cd3612618a3c2214048788f0b2cc463ce0f
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Mon Sep 6 23:53:47 2010 +0100

    drm: Fix regression in disable polling e58f637
    
    I broke out my trusty i845 and found a new boot failure, which upon
    inspection turned out to be a recursion within:
    
    drm_helper_probe_single_connector_modes() -> drm_helper_hpd_irq_event()
    -> intel_crt_detect() -> drm_helper_probe_single_connector_modes()
    
    Calling drm_kms_helper_poll_enable() instead performs the desired
    re-initialisation of the polling should the user have toggled the
    parameter, without the recursive side-effect.
    
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Cc: Dave Airlie <airlied@redhat.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

commit ec0becade1eae9b0f40b12ea4fcc3ea36e993ba3
Author: Dave Airlie <airlied@redhat.com>
Date:   Tue Nov 9 09:48:34 2010 +1000

    drm/kms: Add a module parameter to disable polling
    
    Polling for a VGA device on an old system can be quite expensive,
    causing latencies on the order of 600ms. As we hold the mode mutex for
    this time and also need the same mutex to move the cursor, we trigger a
    user-visible stall.
    
    The real solution would involve improving the granulatity of the
    locking and so perhaps performing some of the probing not under the lock
    or some other updates can be done under different locks. Also reducing the
    cost of probing for a non-existent monitor would be worthwhile. However,
    exposing a parameter to disable polling is a simple workaround in the
    meantime.
    
    In order to accommodate users turning polling on and off at runtime, the
    polling is potentially re-enabled on every probe. This is coupled to
    the user calling xrandr, which seems to be a vaild time to reset the
    polling timeout since the information on the connection has just been
    updated. (The presumption being that all connections are probed in a
    single xrandr pass, which is currently valid.)
    
    References:
    
      Bug 29536 - 2.6.35 causes ~600ms latency every 10s
      https://bugs.freedesktop.org/show_bug.cgi?id=29536
    
      Bug 16265 - Why is kslowd accumulating so much CPU time?
      https://bugzilla.kernel.org/show_bug.cgi?id=16265
    
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Reported-and-tested-by: Bruno Prémont <bonbons@linux-vserver.org>
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    
    Conflicts:
    
    	drivers/gpu/drm/drm_crtc_helper.c

commit 77e90256db2f7e6424717f7cc984b22d2832243f
Author: Dan Carpenter <error27@gmail.com>
Date:   Thu Aug 19 11:46:29 2010 +0200

    drm: move dereference below check
    
    "fb_helper_conn" is dereferenced before the check for NULL.  It's never
    actually NULL here, so this is mostly to keep the static checkers happy.
    
    Signed-off-by: Dan Carpenter <error27@gmail.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

commit 86e25290d9df7a84d185dfc037851d72d270a6c0
Author: Alex Deucher <alexdeucher@gmail.com>
Date:   Tue Jul 20 03:24:11 2010 -0400

    drm/radeon/kms: make sure HPD is set to NONE on analog-only connectors
    
    HPD is digital only.
    
    Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 25d70d6..d537039 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -34,6 +34,9 @@
 #include "drm_crtc_helper.h"
 #include "drm_fb_helper.h"
 
+static bool drm_kms_helper_poll = true;
+module_param_named(poll, drm_kms_helper_poll, bool, 0600);
+
 static void drm_mode_validate_flag(struct drm_connector *connector,
 				   int flags)
 {
@@ -98,8 +101,10 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 			connector->status = connector_status_disconnected;
 		if (connector->funcs->force)
 			connector->funcs->force(connector);
-	} else
-		connector->status = connector->funcs->detect(connector);
+	} else {
+		connector->status = connector->funcs->detect(connector, true);
+		drm_kms_helper_poll_enable(dev);
+	}
 
 	if (connector->status == connector_status_disconnected) {
 		DRM_DEBUG_KMS("%s is disconnected\n",
@@ -820,6 +825,9 @@ static void output_poll_execute(struct slow_work *work)
 	bool repoll = false, changed = false;
 	int ret;
 
+	if (!drm_kms_helper_poll)
+		return;
+
 	mutex_lock(&dev->mode_config.mutex);
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 
@@ -839,7 +847,7 @@ static void output_poll_execute(struct slow_work *work)
 		    !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 			continue;
 
-		status = connector->funcs->detect(connector);
+		status = connector->funcs->detect(connector, false);
 		if (old_status != status)
 			changed = true;
 	}
@@ -874,6 +882,9 @@ void drm_kms_helper_poll_enable(struct drm_device *dev)
 	struct drm_connector *connector;
 	int ret;
 
+	if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
+		return;
+
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if (connector->polled)
 			poll = true;
@@ -909,9 +920,12 @@ void drm_helper_hpd_irq_event(struct drm_device *dev)
 {
 	if (!dev->mode_config.poll_enabled)
 		return;
+
 	delayed_slow_work_cancel(&dev->mode_config.output_poll_slow_work);
 	/* schedule a slow work asap */
-	delayed_slow_work_enqueue(&dev->mode_config.output_poll_slow_work, 0);
+	if (drm_kms_helper_poll)
+		delayed_slow_work_enqueue(&dev->mode_config.output_poll_slow_work, 0);
+
 }
 EXPORT_SYMBOL(drm_helper_hpd_irq_event);
 
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 7196620..cef8d8d 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -94,10 +94,11 @@ static bool drm_fb_helper_connector_parse_command_line(struct drm_fb_helper_conn
 	int i;
 	enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
 	struct drm_fb_helper_cmdline_mode *cmdline_mode;
-	struct drm_connector *connector = fb_helper_conn->connector;
+	struct drm_connector *connector;
 
 	if (!fb_helper_conn)
 		return false;
+	connector = fb_helper_conn->connector;
 
 	cmdline_mode = &fb_helper_conn->cmdline_mode;
 	if (!mode_option)
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 101d381..9500af1 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -159,7 +159,7 @@ static ssize_t status_show(struct device *device,
 	struct drm_connector *connector = to_drm_connector(device);
 	enum drm_connector_status status;
 
-	status = connector->funcs->detect(connector);
+	status = connector->funcs->detect(connector, true);
 	return snprintf(buf, PAGE_SIZE, "%s\n",
 			drm_get_connector_status_name(status));
 }
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index ee0732b..3886b47 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -402,7 +402,8 @@ intel_crt_load_detect(struct drm_crtc *crtc, struct intel_encoder *intel_encoder
 	return status;
 }
 
-static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
+static enum drm_connector_status
+intel_crt_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_device *dev = connector->dev;
 	struct drm_encoder *encoder = intel_attached_encoder(connector);
@@ -421,6 +422,9 @@ static enum drm_connector_status intel_crt_detect(struct drm_connector *connecto
 	if (intel_crt_detect_ddc(encoder))
 		return connector_status_connected;
 
+	if (!force)
+		return connector->status;
+
 	/* for pre-945g platforms use load detect */
 	if (encoder->crtc && encoder->crtc->enabled) {
 		status = intel_crt_load_detect(encoder->crtc, intel_encoder);
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index d9de8f1..b58249d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1287,7 +1287,7 @@ 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)
+intel_dp_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_encoder *encoder = intel_attached_encoder(connector);
 	struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index 227feca..48a1889 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -211,7 +211,8 @@ static void intel_dvo_mode_set(struct drm_encoder *encoder,
  *
  * Unimplemented.
  */
-static enum drm_connector_status intel_dvo_detect(struct drm_connector *connector)
+static enum drm_connector_status
+intel_dvo_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_encoder *encoder = intel_attached_encoder(connector);
 	struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 83bd764..d1decfc 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -134,7 +134,7 @@ static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
 }
 
 static enum drm_connector_status
-intel_hdmi_detect(struct drm_connector *connector)
+intel_hdmi_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_encoder *encoder = intel_attached_encoder(connector);
 	struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 7d42ff1..9ad3425 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -546,7 +546,8 @@ static void intel_lvds_mode_set(struct drm_encoder *encoder,
  * connected and closed means disconnected.  We also send hotplug events as
  * needed, using lid status notification from the input layer.
  */
-static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
+static enum drm_connector_status
+intel_lvds_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_device *dev = connector->dev;
 	enum drm_connector_status status = connector_status_connected;
@@ -641,7 +642,9 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 	 * the LID nofication event.
 	 */
 	if (connector)
-		connector->status = connector->funcs->detect(connector);
+		connector->status = connector->funcs->detect(connector,
+							     false);
+
 	/* Don't force modeset on machines where it causes a GPU lockup */
 	if (dmi_check_system(intel_no_modeset_on_lid))
 		return NOTIFY_OK;
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 76993ac..76c9b3d 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1496,7 +1496,7 @@ intel_analog_is_connected(struct drm_device *dev)
 	if (!analog_connector)
 		return false;
 
-	if (analog_connector->funcs->detect(analog_connector) ==
+	if (analog_connector->funcs->detect(analog_connector, false) ==
 			connector_status_disconnected)
 		return false;
 
@@ -1567,7 +1567,8 @@ intel_sdvo_hdmi_sink_detect(struct drm_connector *connector)
 	return status;
 }
 
-static enum drm_connector_status intel_sdvo_detect(struct drm_connector *connector)
+static enum drm_connector_status
+intel_sdvo_detect(struct drm_connector *connector, bool force)
 {
 	uint16_t response;
 	u8 status;
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 6d553c2..ad40f1b 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1336,7 +1336,7 @@ 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)
+intel_tv_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_crtc *crtc;
 	struct drm_display_mode mode;
@@ -1351,7 +1351,7 @@ intel_tv_detect(struct drm_connector *connector)
 
 	if (encoder->crtc && encoder->crtc->enabled) {
 		type = intel_tv_detect_type(encoder->crtc, intel_encoder);
-	} else {
+	} else if (force) {
 		crtc = intel_get_load_detect_pipe(intel_encoder, connector,
 						  &mode, &dpms_mode);
 		if (crtc) {
@@ -1359,8 +1359,9 @@ intel_tv_detect(struct drm_connector *connector)
 			intel_release_load_detect_pipe(intel_encoder, connector,
 						       dpms_mode);
 		} else
-			type = -1;
-	}
+			return connector_status_unknown;
+	} else
+		return connector->status;
 
 	tv_priv->type = type;
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 149ed22..1085376 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -228,7 +228,7 @@ nouveau_connector_set_encoder(struct drm_connector *connector,
 }
 
 static enum drm_connector_status
-nouveau_connector_detect(struct drm_connector *connector)
+nouveau_connector_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_device *dev = connector->dev;
 	struct nouveau_connector *nv_connector = nouveau_connector(connector);
diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index adccbc2..1680600 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -467,7 +467,8 @@ static int radeon_lvds_mode_valid(struct drm_connector *connector,
 	return MODE_OK;
 }
 
-static enum drm_connector_status radeon_lvds_detect(struct drm_connector *connector)
+static enum drm_connector_status
+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);
@@ -582,7 +583,8 @@ static int radeon_vga_mode_valid(struct drm_connector *connector,
 	return MODE_OK;
 }
 
-static enum drm_connector_status radeon_vga_detect(struct drm_connector *connector)
+static enum drm_connector_status
+radeon_vga_detect(struct drm_connector *connector, bool force)
 {
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	struct drm_encoder *encoder;
@@ -621,6 +623,11 @@ static enum drm_connector_status radeon_vga_detect(struct drm_connector *connect
 				ret = connector_status_connected;
 		}
 	} else {
+
+		/* if we aren't forcing don't do destructive polling */
+		if (!force)
+			return connector->status;
+
 		if (radeon_connector->dac_load_detect && encoder) {
 			encoder_funcs = encoder->helper_private;
 			ret = encoder_funcs->detect(encoder, connector);
@@ -679,7 +686,8 @@ static int radeon_tv_mode_valid(struct drm_connector *connector,
 	return MODE_OK;
 }
 
-static enum drm_connector_status radeon_tv_detect(struct drm_connector *connector)
+static enum drm_connector_status
+radeon_tv_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_encoder *encoder;
 	struct drm_encoder_helper_funcs *encoder_funcs;
@@ -736,7 +744,8 @@ static int radeon_dvi_get_modes(struct drm_connector *connector)
  * we have to check if this analog encoder is shared with anyone else (TV)
  * if its shared we have to set the other connector to disconnected.
  */
-static enum drm_connector_status radeon_dvi_detect(struct drm_connector *connector)
+static enum drm_connector_status
+radeon_dvi_detect(struct drm_connector *connector, bool force)
 {
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	struct drm_encoder *encoder = NULL;
@@ -806,6 +815,11 @@ static enum drm_connector_status radeon_dvi_detect(struct drm_connector *connect
 	if ((ret == connector_status_connected) && (radeon_connector->use_digital == true))
 		goto out;
 
+	if (!force) {
+		ret = connector->status;
+		goto out;
+	}
+
 	/* find analog encoder */
 	if (radeon_connector->dac_load_detect) {
 		for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
@@ -962,7 +976,8 @@ static int radeon_dp_get_modes(struct drm_connector *connector)
 	return ret;
 }
 
-static enum drm_connector_status radeon_dp_detect(struct drm_connector *connector)
+static enum drm_connector_status
+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;
@@ -1082,6 +1097,8 @@ radeon_add_atom_connector(struct drm_device *dev,
 		drm_connector_attach_property(&radeon_connector->base,
 					      rdev->mode_info.load_detect_property,
 					      1);
+		/* no HPD on analog connectors */
+		radeon_connector->hpd.hpd = RADEON_HPD_NONE;
 		connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 		connector->interlace_allowed = true;
 		connector->doublescan_allowed = true;
@@ -1096,6 +1113,8 @@ radeon_add_atom_connector(struct drm_device *dev,
 		drm_connector_attach_property(&radeon_connector->base,
 					      rdev->mode_info.load_detect_property,
 					      1);
+		/* no HPD on analog connectors */
+		radeon_connector->hpd.hpd = RADEON_HPD_NONE;
 		connector->interlace_allowed = true;
 		connector->doublescan_allowed = true;
 		break;
@@ -1186,6 +1205,8 @@ radeon_add_atom_connector(struct drm_device *dev,
 			drm_connector_attach_property(&radeon_connector->base,
 						      rdev->mode_info.tv_std_property,
 						      radeon_atombios_get_tv_info(rdev));
+			/* no HPD on analog connectors */
+			radeon_connector->hpd.hpd = RADEON_HPD_NONE;
 		}
 		connector->interlace_allowed = false;
 		connector->doublescan_allowed = false;
@@ -1209,7 +1230,7 @@ radeon_add_atom_connector(struct drm_device *dev,
 		break;
 	}
 
-	if (hpd->hpd == RADEON_HPD_NONE) {
+	if (radeon_connector->hpd.hpd == RADEON_HPD_NONE) {
 		if (i2c_bus->valid)
 			connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 	} else
@@ -1276,6 +1297,8 @@ radeon_add_legacy_connector(struct drm_device *dev,
 		drm_connector_attach_property(&radeon_connector->base,
 					      rdev->mode_info.load_detect_property,
 					      1);
+		/* no HPD on analog connectors */
+		radeon_connector->hpd.hpd = RADEON_HPD_NONE;
 		connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 		connector->interlace_allowed = true;
 		connector->doublescan_allowed = true;
@@ -1290,6 +1313,8 @@ radeon_add_legacy_connector(struct drm_device *dev,
 		drm_connector_attach_property(&radeon_connector->base,
 					      rdev->mode_info.load_detect_property,
 					      1);
+		/* no HPD on analog connectors */
+		radeon_connector->hpd.hpd = RADEON_HPD_NONE;
 		connector->interlace_allowed = true;
 		connector->doublescan_allowed = true;
 		break;
@@ -1328,6 +1353,8 @@ radeon_add_legacy_connector(struct drm_device *dev,
 			drm_connector_attach_property(&radeon_connector->base,
 						      rdev->mode_info.tv_std_property,
 						      radeon_combios_get_tv_info(rdev));
+			/* no HPD on analog connectors */
+			radeon_connector->hpd.hpd = RADEON_HPD_NONE;
 		}
 		connector->interlace_allowed = false;
 		connector->doublescan_allowed = false;
@@ -1345,7 +1372,7 @@ radeon_add_legacy_connector(struct drm_device *dev,
 		break;
 	}
 
-	if (hpd->hpd == RADEON_HPD_NONE) {
+	if (radeon_connector->hpd.hpd == RADEON_HPD_NONE) {
 		if (i2c_bus->valid)
 			connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 	} else
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
index cfaf690..5b638cb 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
@@ -335,7 +335,8 @@ static void vmw_ldu_connector_restore(struct drm_connector *connector)
 }
 
 static enum drm_connector_status
-	vmw_ldu_connector_detect(struct drm_connector *connector)
+	vmw_ldu_connector_detect(struct drm_connector *connector,
+				 bool force)
 {
 	if (vmw_connector_to_ldu(connector)->pref_active)
 		return connector_status_connected;
@@ -516,7 +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);
@@ -610,7 +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);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 93a1a31..afbb578 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -420,7 +420,15 @@ struct drm_connector_funcs {
 	void (*dpms)(struct drm_connector *connector, int mode);
 	void (*save)(struct drm_connector *connector);
 	void (*restore)(struct drm_connector *connector);
-	enum drm_connector_status (*detect)(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 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);