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>

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index de152a5..fb6b70f 100644 (file)
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/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);
+               connector->status = connector->funcs->detect(connector, false);
                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);
+               status = connector->funcs->detect(connector, true);
                if (old_status != status)
                        changed = true;
        }

diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 86118a7..85da4c4 100644 (file)
--- 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 4b77351..0350e5d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -400,7 +400,9 @@ 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 nondestructive)
 {
        struct drm_device *dev = connector->dev;
        struct drm_encoder *encoder = intel_attached_encoder(connector);
@@ -419,6 +421,9 @@ static enum drm_connector_status intel_crt_detect(struct drm_connector *connecto
        if (intel_crt_detect_ddc(encoder))
                return connector_status_connected;
 
+       if (nondestructive)
+               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 51d1429..e1a2a05 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1386,7 +1386,8 @@ 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 nondestructive)
 {
        struct drm_encoder *encoder = intel_attached_encoder(connector);
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index a399f4b..f0de1ad 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -221,7 +221,9 @@ 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 nondestructive)
 {
        struct drm_encoder *encoder = intel_attached_encoder(connector);
        struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index ccd4c97..2ea123d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -139,7 +139,8 @@ 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 nondestructive)
 {
        struct drm_encoder *encoder = intel_attached_encoder(connector);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 4fbb016..fb1bed8 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -445,7 +445,9 @@ 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 nondestructive)
 {
        struct drm_device *dev = connector->dev;
        enum drm_connector_status status = connector_status_connected;
@@ -540,7 +542,9 @@ 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,
+                                                            true);
+
        /* 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 e3b7a7e..db6b6d4 100644 (file)
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/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) ==
+       if (analog_connector->funcs->detect(analog_connector, true) ==
                        connector_status_disconnected)
                return false;
 
@@ -1486,7 +1486,9 @@ 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 nondestructive)
 {
        uint16_t response;
        struct drm_encoder *encoder = intel_attached_encoder(connector);

diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index c671f60..d20b550 100644 (file)
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1341,7 +1341,8 @@ 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 nondestructive)
 {
        struct drm_display_mode mode;
        struct drm_encoder *encoder = intel_attached_encoder(connector);
@@ -1353,7 +1354,7 @@ intel_tv_detect(struct drm_connector *connector)
 
        if (encoder->crtc && encoder->crtc->enabled) {
                type = intel_tv_detect_type(intel_tv);
-       } else {
+       } else if (nondestructive) {
                struct drm_crtc *crtc;
                int dpms_mode;
 
@@ -1364,10 +1365,9 @@ intel_tv_detect(struct drm_connector *connector)
                        intel_release_load_detect_pipe(&intel_tv->base, connector,
                                                       dpms_mode);
                } else
-                       type = -1;
-       }
-
-       intel_tv->type = type;
+                       return connector_status_unknown;
+       } else
+               return connector->status;
 
        if (type < 0)
                return connector_status_disconnected;

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index a1473ff..67d515c 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -168,7 +168,8 @@ 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 nondestructive)
 {
        struct drm_device *dev = connector->dev;
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
@@ -246,7 +247,8 @@ detect_analog:
 }
 
 static enum drm_connector_status
-nouveau_connector_detect_lvds(struct drm_connector *connector)
+nouveau_connector_detect_lvds(struct drm_connector *connector,
+                             bool nondestructive)
 {
        struct drm_device *dev = connector->dev;
        struct drm_nouveau_private *dev_priv = dev->dev_private;
@@ -267,7 +269,7 @@ 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);
+               status = nouveau_connector_detect(connector, nondestructive);
                if (status == connector_status_connected)
                        goto out;
        }

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index a9dd784..31d309a 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -481,7 +481,9 @@ 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 nondestructive)
 {
        struct radeon_connector *radeon_connector = to_radeon_connector(connector);
        struct drm_encoder *encoder = radeon_best_single_encoder(connector);
@@ -594,7 +596,9 @@ 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 nondestructive)
 {
        struct radeon_connector *radeon_connector = to_radeon_connector(connector);
        struct drm_encoder *encoder;
@@ -691,7 +695,9 @@ 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 nondestructive)
 {
        struct drm_encoder *encoder;
        struct drm_encoder_helper_funcs *encoder_funcs;
@@ -748,7 +754,9 @@ 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 nondestructive)
 {
        struct radeon_connector *radeon_connector = to_radeon_connector(connector);
        struct drm_encoder *encoder = NULL;
@@ -972,7 +980,9 @@ 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 nondestructive)
 {
        struct radeon_connector *radeon_connector = to_radeon_connector(connector);
        enum drm_connector_status ret = connector_status_disconnected;

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
index 2ff5cf7..a527c91 100644 (file)
--- 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 nondestructive)
 {
        if (vmw_connector_to_ldu(connector)->pref_active)
                return connector_status_connected;

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c9f3cc5..5536223 100644 (file)
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -386,7 +386,8 @@ 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);
+       enum drm_connector_status (*detect)(struct drm_connector *connector,
+                                           bool nondestructive);
        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);