[PATCH v6 0/3] Send a hotplug when edid changes

[PATCH v6 0/3] Send a hotplug when edid changes

[Kunal Joshi]

From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

This series introduce to drm a way to determine if something else
except connection_status had changed during probing, which
can be used by other drivers as well. Another i915 specific part
uses this approach to determine if edid had changed without
changing the connection status and send a hotplug event.

Stanislav Lisovskiy (3):
  drm: Add helper to compare edids.
  drm: Introduce epoch counter to drm_connector
  drm/i915: Send hotplug event if edid had changed

 drivers/gpu/drm/drm_connector.c              | 16 ++++++++
 drivers/gpu/drm/drm_edid.c                   | 39 +++++++++++++++++++-
 drivers/gpu/drm/drm_probe_helper.c           | 38 ++++++++++++++++---
 drivers/gpu/drm/i915/display/intel_hotplug.c | 26 +++++++------
 include/drm/drm_connector.h                  |  2 +
 include/drm/drm_edid.h                       |  9 +++++
 6 files changed, 113 insertions(+), 17 deletions(-)

-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v6 1/3] drm: Add helper to compare edids.

[Kunal Joshi]

From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

Many drivers would benefit from using
drm helper to compare edid, rather
than bothering with own implementation.

v2: Added documentation for this function.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
---
 drivers/gpu/drm/drm_edid.c | 33 +++++++++++++++++++++++++++++++++
 include/drm/drm_edid.h     |  9 +++++++++
 2 files changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index d8372d63851b..34cabfddcdd3 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1615,6 +1615,39 @@ static bool drm_edid_is_zero(const u8 *in_edid, int length)
 	return true;
 }
 
+/**
+ * drm_edid_are_equal - compare two edid blobs.
+ * @edid1: pointer to first blob
+ * @edid2: pointer to second blob
+ * This helper can be used during probing to determine if
+ * edid had changed.
+ */
+bool drm_edid_are_equal(const struct edid *edid1, const struct edid *edid2)
+{
+	int edid1_len, edid2_len;
+	bool edid1_present = edid1 != NULL;
+	bool edid2_present = edid2 != NULL;
+
+	if (edid1_present != edid2_present)
+		return false;
+
+	if (edid1) {
+
+		edid1_len = EDID_LENGTH * (1 + edid1->extensions);
+		edid2_len = EDID_LENGTH * (1 + edid2->extensions);
+
+		if (edid1_len != edid2_len)
+			return false;
+
+		if (memcmp(edid1, edid2, edid1_len))
+			return false;
+	}
+
+	return true;
+}
+EXPORT_SYMBOL(drm_edid_are_equal);
+
+
 /**
  * drm_edid_block_valid - Sanity check the EDID block (base or extension)
  * @raw_edid: pointer to raw EDID block
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 34b15e3d070c..5c26cc65b786 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -359,6 +359,15 @@ drm_load_edid_firmware(struct drm_connector *connector)
 }
 #endif
 
+/**
+ * drm_edid_are_equal - compare two edid blobs.
+ * @edid1: pointer to first blob
+ * @edid2: pointer to second blob
+ * This helper can be used during probing to determine if
+ * edid had changed.
+ */
+bool drm_edid_are_equal(const struct edid *edid1, const struct edid *edid2);
+
 int
 drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
 					 struct drm_connector *connector,
-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v6 2/3] drm: Introduce epoch counter to drm_connector

[Kunal Joshi]

From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

This counter will be used by drm_helper_probe_detect caller to determine
if anything had changed(including edid, connection status and etc).
Hardware specific driver detect hooks are responsible for updating this
counter when some change is detected to notify the drm part,
which can trigger for example hotplug event.

Also now call drm_connector_update_edid_property
right after we get edid always to make sure there is a
unified way to handle edid change, without having to
change tons of source code as currently
drm_connector_update_edid_property is called only in
certain cases like reprobing and not right after edid is
actually updated.

v2: Added documentation for the new counter. Rename change_counter to
    epoch_counter.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105540

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
---
 drivers/gpu/drm/drm_connector.c    | 16 +++++++++++++
 drivers/gpu/drm/drm_edid.c         |  6 ++++-
 drivers/gpu/drm/drm_probe_helper.c | 38 ++++++++++++++++++++++++++----
 include/drm/drm_connector.h        |  2 ++
 4 files changed, 56 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index b7bd46033807..332686297e45 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -269,6 +269,7 @@ int drm_connector_init(struct drm_device *dev,
 	INIT_LIST_HEAD(&connector->modes);
 	mutex_init(&connector->mutex);
 	connector->edid_blob_ptr = NULL;
+	connector->epoch_counter = 0;
 	connector->tile_blob_ptr = NULL;
 	connector->status = connector_status_unknown;
 	connector->display_info.panel_orientation =
@@ -1979,6 +1980,7 @@ int drm_connector_update_edid_property(struct drm_connector *connector,
 	struct drm_device *dev = connector->dev;
 	size_t size = 0;
 	int ret;
+	const struct edid *old_edid;
 
 	/* ignore requests to set edid when overridden */
 	if (connector->override_edid)
@@ -2002,6 +2004,20 @@ int drm_connector_update_edid_property(struct drm_connector *connector,
 
 	drm_update_tile_info(connector, edid);
 
+	if (connector->edid_blob_ptr) {
+		old_edid = (const struct edid *)connector->edid_blob_ptr->data;
+		if (old_edid) {
+			if (!drm_edid_are_equal(edid, old_edid)) {
+				DRM_DEBUG_KMS("[CONNECTOR:%d:%s] Edid was changed.\n",
+				    connector->base.id, connector->name);
+
+				connector->epoch_counter += 1;
+				DRM_DEBUG_KMS("Updating change counter to %llu\n",
+				    connector->epoch_counter);
+			}
+		}
+	}
+
 	drm_object_property_set_value(&connector->base,
 				      dev->mode_config.non_desktop_property,
 				      connector->display_info.non_desktop);
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 34cabfddcdd3..d029cbd5d037 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2050,13 +2050,17 @@ EXPORT_SYMBOL(drm_probe_ddc);
 struct edid *drm_get_edid(struct drm_connector *connector,
 			  struct i2c_adapter *adapter)
 {
+	struct edid *edid;
+
 	if (connector->force == DRM_FORCE_OFF)
 		return NULL;
 
 	if (connector->force == DRM_FORCE_UNSPECIFIED && !drm_probe_ddc(adapter))
 		return NULL;
 
-	return drm_do_get_edid(connector, drm_do_probe_ddc_edid, adapter);
+	edid = drm_do_get_edid(connector, drm_do_probe_ddc_edid, adapter);
+	drm_connector_update_edid_property(connector, edid);
+	return edid;
 }
 EXPORT_SYMBOL(drm_get_edid);
 
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 26e997f1524f..1d5f319d6213 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -290,6 +290,9 @@ drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force)
 	if (WARN_ON(ret < 0))
 		ret = connector_status_unknown;
 
+	if (ret != connector->status)
+		connector->epoch_counter += 1;
+
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
 
@@ -323,11 +326,16 @@ drm_helper_probe_detect(struct drm_connector *connector,
 		return ret;
 
 	if (funcs->detect_ctx)
-		return funcs->detect_ctx(connector, ctx, force);
+		ret = funcs->detect_ctx(connector, ctx, force);
 	else if (connector->funcs->detect)
-		return connector->funcs->detect(connector, force);
+		ret = connector->funcs->detect(connector, force);
 	else
-		return connector_status_connected;
+		ret = connector_status_connected;
+
+	if (ret != connector->status)
+		connector->epoch_counter += 1;
+
+	return ret;
 }
 EXPORT_SYMBOL(drm_helper_probe_detect);
 
@@ -777,6 +785,7 @@ bool drm_helper_hpd_irq_event(struct drm_device *dev)
 	struct drm_connector_list_iter conn_iter;
 	enum drm_connector_status old_status;
 	bool changed = false;
+	uint64_t old_epoch_counter;
 
 	if (!dev->mode_config.poll_enabled)
 		return false;
@@ -790,20 +799,39 @@ bool drm_helper_hpd_irq_event(struct drm_device *dev)
 
 		old_status = connector->status;
 
+		old_epoch_counter = connector->epoch_counter;
+
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] Old epoch counter %llu\n", connector->base.id,
+			      connector->name,
+			      old_epoch_counter);
+
 		connector->status = drm_helper_probe_detect(connector, NULL, false);
 		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
 			      connector->base.id,
 			      connector->name,
 			      drm_get_connector_status_name(old_status),
 			      drm_get_connector_status_name(connector->status));
-		if (old_status != connector->status)
+
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] New epoch counter %llu\n",
+			      connector->base.id,
+			      connector->name,
+			      connector->epoch_counter);
+
+		/*
+		 * Check if epoch counter had changed, meaning that we need
+		 * to send a uevent.
+		 */
+		if (old_epoch_counter != connector->epoch_counter) {
 			changed = true;
+		}
 	}
 	drm_connector_list_iter_end(&conn_iter);
 	mutex_unlock(&dev->mode_config.mutex);
 
-	if (changed)
+	if (changed) {
 		drm_kms_helper_hotplug_event(dev);
+		DRM_DEBUG_KMS("Sent hotplug event\n");
+	}
 
 	return changed;
 }
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index fd543d1db9b2..20bdc16eefe2 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1329,6 +1329,8 @@ struct drm_connector {
 	enum drm_connector_force force;
 	/** @override_edid: has the EDID been overwritten through debugfs for testing? */
 	bool override_edid;
+        /** @epoch_counter: used to detect any other changes in connector, besides status */
+        uint64_t epoch_counter;
 
 	/**
 	 * @possible_encoders: Bit mask of encoders that can drive this
-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v6 3/3] drm/i915: Send hotplug event if edid had changed

[Kunal Joshi]

From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

Added epoch counter checking to intel_encoder_hotplug
in order to be able process all the connector changes,
besides connection status. Also now any change in connector
would result in epoch counter change, so no multiple checks
are needed.

v2: Renamed change counter to epoch counter. Fixed type name.

v3: Fixed rebase conflict

v4: Remove duplicate drm_edid_equal checks from hdmi and dp,
    lets use only once edid property is getting updated and
    increment epoch counter from there.
    Also lets now call drm_connector_update_edid_property
    right after we get edid always to make sure there is a
    unified way to handle edid change, without having to
    change tons of source code as currently
    drm_connector_update_edid_property is called only in
    certain cases like reprobing and not right after edid is
    actually updated.

v5: Fixed const modifiers, removed blank line

v6: Removed drm specific part from this patch, leaving only
    i915 specific changes here.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
---
 drivers/gpu/drm/i915/display/intel_hotplug.c | 26 +++++++++++---------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
index 2e94c1413c02..393813494523 100644
--- a/drivers/gpu/drm/i915/display/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
@@ -283,6 +283,8 @@ intel_encoder_hotplug(struct intel_encoder *encoder,
 {
 	struct drm_device *dev = connector->base.dev;
 	enum drm_connector_status old_status;
+        u64 old_epoch_counter;
+        bool ret = false;
 
 	drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
 	old_status = connector->base.status;
@@ -290,17 +292,19 @@ intel_encoder_hotplug(struct intel_encoder *encoder,
 	connector->base.status =
 		drm_helper_probe_detect(&connector->base, NULL, false);
 
-	if (old_status == connector->base.status)
-		return INTEL_HOTPLUG_UNCHANGED;
-
-	drm_dbg_kms(&to_i915(dev)->drm,
-		    "[CONNECTOR:%d:%s] status updated from %s to %s\n",
-		    connector->base.base.id,
-		    connector->base.name,
-		    drm_get_connector_status_name(old_status),
-		    drm_get_connector_status_name(connector->base.status));
-
-	return INTEL_HOTPLUG_CHANGED;
+        if (old_epoch_counter != connector->base.epoch_counter)
+                ret = true;
+
+        if(ret) {
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s(epoch counter %llu)\n",
+			      connector->base.base.id,
+			      connector->base.name,
+			      drm_get_connector_status_name(old_status),
+			      drm_get_connector_status_name(connector->base.status),
+			      connector->base.epoch_counter);
+		return INTEL_HOTPLUG_CHANGED;
+        }
+        return INTEL_HOTPLUG_UNCHANGED;
 }
 
 static bool intel_encoder_has_hpd_pulse(struct intel_encoder *encoder)
-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v6 3/3] drm/i915: Send hotplug event if edid had changed

[Maarten Lankhorst]

Op 23-06-2020 om 20:57 schreef Kunal Joshi:
> From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
>
> Added epoch counter checking to intel_encoder_hotplug
> in order to be able process all the connector changes,
> besides connection status. Also now any change in connector
> would result in epoch counter change, so no multiple checks
> are needed.
>
> v2: Renamed change counter to epoch counter. Fixed type name.
>
> v3: Fixed rebase conflict
>
> v4: Remove duplicate drm_edid_equal checks from hdmi and dp,
>     lets use only once edid property is getting updated and
>     increment epoch counter from there.
>     Also lets now call drm_connector_update_edid_property
>     right after we get edid always to make sure there is a
>     unified way to handle edid change, without having to
>     change tons of source code as currently
>     drm_connector_update_edid_property is called only in
>     certain cases like reprobing and not right after edid is
>     actually updated.
>
> v5: Fixed const modifiers, removed blank line
>
> v6: Removed drm specific part from this patch, leaving only
>     i915 specific changes here.
>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> ---

Much better!

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

for whole series

>  drivers/gpu/drm/i915/display/intel_hotplug.c | 26 +++++++++++---------
>  1 file changed, 15 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
> index 2e94c1413c02..393813494523 100644
> --- a/drivers/gpu/drm/i915/display/intel_hotplug.c
> +++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
> @@ -283,6 +283,8 @@ intel_encoder_hotplug(struct intel_encoder *encoder,
>  {
>  	struct drm_device *dev = connector->base.dev;
>  	enum drm_connector_status old_status;
> +        u64 old_epoch_counter;
> +        bool ret = false;
>  
>  	drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
>  	old_status = connector->base.status;
> @@ -290,17 +292,19 @@ intel_encoder_hotplug(struct intel_encoder *encoder,
>  	connector->base.status =
>  		drm_helper_probe_detect(&connector->base, NULL, false);
>  
> -	if (old_status == connector->base.status)
> -		return INTEL_HOTPLUG_UNCHANGED;
> -
> -	drm_dbg_kms(&to_i915(dev)->drm,
> -		    "[CONNECTOR:%d:%s] status updated from %s to %s\n",
> -		    connector->base.base.id,
> -		    connector->base.name,
> -		    drm_get_connector_status_name(old_status),
> -		    drm_get_connector_status_name(connector->base.status));
> -
> -	return INTEL_HOTPLUG_CHANGED;
> +        if (old_epoch_counter != connector->base.epoch_counter)
> +                ret = true;
> +
> +        if(ret) {
> +		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s(epoch counter %llu)\n",
> +			      connector->base.base.id,
> +			      connector->base.name,
> +			      drm_get_connector_status_name(old_status),
> +			      drm_get_connector_status_name(connector->base.status),
> +			      connector->base.epoch_counter);
> +		return INTEL_HOTPLUG_CHANGED;
> +        }
> +        return INTEL_HOTPLUG_UNCHANGED;
>  }
>  
>  static bool intel_encoder_has_hpd_pulse(struct intel_encoder *encoder)


_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v6 3/3] drm/i915: Send hotplug event if edid had changed

[Lisovskiy, Stanislav]

On Thu, Jun 25, 2020 at 10:36:28AM +0200, Maarten Lankhorst wrote:
> Op 23-06-2020 om 20:57 schreef Kunal Joshi:
> > From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> >
> > Added epoch counter checking to intel_encoder_hotplug
> > in order to be able process all the connector changes,
> > besides connection status. Also now any change in connector
> > would result in epoch counter change, so no multiple checks
> > are needed.
> >
> > v2: Renamed change counter to epoch counter. Fixed type name.
> >
> > v3: Fixed rebase conflict
> >
> > v4: Remove duplicate drm_edid_equal checks from hdmi and dp,
> >     lets use only once edid property is getting updated and
> >     increment epoch counter from there.
> >     Also lets now call drm_connector_update_edid_property
> >     right after we get edid always to make sure there is a
> >     unified way to handle edid change, without having to
> >     change tons of source code as currently
> >     drm_connector_update_edid_property is called only in
> >     certain cases like reprobing and not right after edid is
> >     actually updated.
> >
> > v5: Fixed const modifiers, removed blank line
> >
> > v6: Removed drm specific part from this patch, leaving only
> >     i915 specific changes here.
> >
> > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> > ---
> 
> Much better!
> 
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> 
> for whole series

I think it had been for year in that state already :)
At some point I was just distracted by some other things.

Stan

> 
> >  drivers/gpu/drm/i915/display/intel_hotplug.c | 26 +++++++++++---------
> >  1 file changed, 15 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
> > index 2e94c1413c02..393813494523 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hotplug.c
> > +++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
> > @@ -283,6 +283,8 @@ intel_encoder_hotplug(struct intel_encoder *encoder,
> >  {
> >  	struct drm_device *dev = connector->base.dev;
> >  	enum drm_connector_status old_status;
> > +        u64 old_epoch_counter;
> > +        bool ret = false;
> >  
> >  	drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
> >  	old_status = connector->base.status;
> > @@ -290,17 +292,19 @@ intel_encoder_hotplug(struct intel_encoder *encoder,
> >  	connector->base.status =
> >  		drm_helper_probe_detect(&connector->base, NULL, false);
> >  
> > -	if (old_status == connector->base.status)
> > -		return INTEL_HOTPLUG_UNCHANGED;
> > -
> > -	drm_dbg_kms(&to_i915(dev)->drm,
> > -		    "[CONNECTOR:%d:%s] status updated from %s to %s\n",
> > -		    connector->base.base.id,
> > -		    connector->base.name,
> > -		    drm_get_connector_status_name(old_status),
> > -		    drm_get_connector_status_name(connector->base.status));
> > -
> > -	return INTEL_HOTPLUG_CHANGED;
> > +        if (old_epoch_counter != connector->base.epoch_counter)
> > +                ret = true;
> > +
> > +        if(ret) {
> > +		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s(epoch counter %llu)\n",
> > +			      connector->base.base.id,
> > +			      connector->base.name,
> > +			      drm_get_connector_status_name(old_status),
> > +			      drm_get_connector_status_name(connector->base.status),
> > +			      connector->base.epoch_counter);
> > +		return INTEL_HOTPLUG_CHANGED;
> > +        }
> > +        return INTEL_HOTPLUG_UNCHANGED;
> >  }
> >  
> >  static bool intel_encoder_has_hpd_pulse(struct intel_encoder *encoder)
> 
> 
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v6 3/3] drm/i915: Send hotplug event if edid had changed

[Stanislav Lisovskiy]

Added epoch counter checking to intel_encoder_hotplug
in order to be able process all the connector changes,
besides connection status. Also now any change in connector
would result in epoch counter change, so no multiple checks
are needed.

v2: Renamed change counter to epoch counter. Fixed type name.

v3: Fixed rebase conflict

v4: Remove duplicate drm_edid_equal checks from hdmi and dp,
    lets use only once edid property is getting updated and
    increment epoch counter from there.
    Also lets now call drm_connector_update_edid_property
    right after we get edid always to make sure there is a
    unified way to handle edid change, without having to
    change tons of source code as currently
    drm_connector_update_edid_property is called only in
    certain cases like reprobing and not right after edid is
    actually updated.

v5: Fixed const modifiers, removed blank line

v6: Removed drm specific part from this patch, leaving only
    i915 specific changes here.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
---
 drivers/gpu/drm/i915/display/intel_hotplug.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
index fc29046d48ea..1e3e425dd78d 100644
--- a/drivers/gpu/drm/i915/display/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
@@ -280,23 +280,31 @@ intel_encoder_hotplug(struct intel_encoder *encoder,
 {
 	struct drm_device *dev = connector->base.dev;
 	enum drm_connector_status old_status;
+	u64 old_epoch_counter;
+	bool ret = false;
 
 	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
 	old_status = connector->base.status;
 
+	old_epoch_counter = connector->base.epoch_counter;
+
 	connector->base.status =
 		drm_helper_probe_detect(&connector->base, NULL, false);
 
-	if (old_status == connector->base.status)
-		return INTEL_HOTPLUG_UNCHANGED;
+	if (old_epoch_counter != connector->base.epoch_counter)
+		ret = true;
 
-	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
+	if (ret) {
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s(epoch counter %llu)\n",
 		      connector->base.base.id,
 		      connector->base.name,
 		      drm_get_connector_status_name(old_status),
-		      drm_get_connector_status_name(connector->base.status));
+		      drm_get_connector_status_name(connector->base.status),
+		      connector->base.epoch_counter);
+		return INTEL_HOTPLUG_CHANGED;
+	}
 
-	return INTEL_HOTPLUG_CHANGED;
+	return INTEL_HOTPLUG_UNCHANGED;
 }
 
 static bool intel_encoder_has_hpd_pulse(struct intel_encoder *encoder)
-- 
2.17.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx