The hotplug detection routine of i915 uses drm_helper_hpd_irq_event(). This helper can detect changing of status of connector, but it can not detect changing of edid. Following scenario requires detection of changing of edid.
1) plug display device to a connector 2) system suspend 3) unplug 1)'s display device and plug the other display device to a connector 4) system resume
It adds edid check routine when a connector status still remains as "connector_status_connected".
Testcase: igt/kms_chamelium/hdmi-edid-change-during-hibernate Testcase: igt/kms_chamelium/hdmi-edid-change-during-suspend Testcase: igt/kms_chamelium/dp-edid-change-during-hibernate Testcase: igt/kms_chamelium/dp-edid-change-during-suspend
Signed-off-by: Gwan-gyeong Mun gwan-gyeong.mun@intel.com --- drivers/gpu/drm/i915/intel_hotplug.c | 80 +++++++++++++++++++++++++++- 1 file changed, 79 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c index 648a13c6043c..b92b83d46ccc 100644 --- a/drivers/gpu/drm/i915/intel_hotplug.c +++ b/drivers/gpu/drm/i915/intel_hotplug.c @@ -507,6 +507,84 @@ void intel_hpd_init(struct drm_i915_private *dev_priv) } }
+/** + * intel_hpd_irq_event - hotplug processing + * @dev: drm_device + * + * Drivers can use this function to run a detect cycle on all connectors which + * have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All other + * connectors are ignored, which is useful to avoid reprobing fixed panels. + * + * This function is useful for drivers which can't or don't track hotplug interrupts + * for each connector. This function is based on drm_helper_hpd_irq_event() helper + * function and besides it adds edid check routine when a connector status still + * remains as "connector_status_connected". + * + * Following scenario requires detection of changing of edid. + * 1) plug display device to a connector + * 2) system suspend + * 3) unplug 1)'s display device and plug the other display device to a connector + * 4) system resume + + * This function must be called from process context with no mode + * setting locks held. + * + * Note that a connector can be both polled and probed from the hotplug handler, + * in case the hotplug interrupt is known to be unreliable. + */ +static bool intel_hpd_irq_event(struct drm_device *dev) +{ + struct drm_connector *connector; + struct drm_connector_list_iter conn_iter; + enum drm_connector_status old_status, cur_status; + struct edid *old_edid; + bool changed = false; + + if (!dev->mode_config.poll_enabled) + return false; + + mutex_lock(&dev->mode_config.mutex); + drm_connector_list_iter_begin(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) { + /* Only handle HPD capable connectors. */ + if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) + continue; + + old_status = connector->status; + old_edid = to_intel_connector(connector)->detect_edid; + + cur_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(cur_status)); + + if (old_status != cur_status) + changed = true; + + /* Check changing of edid when a connector status still remains + * as "connector_status_connected". */ + if (old_status == cur_status && + cur_status == connector_status_connected) { + struct edid *cur_edid = to_intel_connector(connector)->detect_edid; + + if (memcmp(old_edid, cur_edid, sizeof(*cur_edid)) != 0) { + changed = true; + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] edid updated\n", + connector->base.id, + connector->name); + } + } + } + drm_connector_list_iter_end(&conn_iter); + mutex_unlock(&dev->mode_config.mutex); + + if (changed) + drm_kms_helper_hotplug_event(dev); + + return changed; +} + static void i915_hpd_poll_init_work(struct work_struct *work) { struct drm_i915_private *dev_priv = @@ -552,7 +630,7 @@ static void i915_hpd_poll_init_work(struct work_struct *work) * in the middle of disabling polling */ if (!enabled) - drm_helper_hpd_irq_event(dev); + intel_hpd_irq_event(dev); }
/**
The hotplug detection routine of i915 uses drm_helper_hpd_irq_event(). This helper can detect changing of status of connector, but it can not detect changing of edid. Following scenario requires detection of changing of edid.
1) plug display device to a connector 2) system suspend 3) unplug 1)'s display device and plug the other display device to a connector 4) system resume
It adds edid check routine when a connector status still remains as "connector_status_connected".
v2: Add NULL check before comparing of EDIDs.
Testcase: igt/kms_chamelium/hdmi-edid-change-during-hibernate Testcase: igt/kms_chamelium/hdmi-edid-change-during-suspend Testcase: igt/kms_chamelium/dp-edid-change-during-hibernate Testcase: igt/kms_chamelium/dp-edid-change-during-suspend
Signed-off-by: Gwan-gyeong Mun gwan-gyeong.mun@intel.com --- drivers/gpu/drm/i915/intel_hotplug.c | 83 +++++++++++++++++++++++++++- 1 file changed, 82 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c index 648a13c6043c..0bd3e1c38167 100644 --- a/drivers/gpu/drm/i915/intel_hotplug.c +++ b/drivers/gpu/drm/i915/intel_hotplug.c @@ -507,6 +507,87 @@ void intel_hpd_init(struct drm_i915_private *dev_priv) } }
+/** + * intel_hpd_irq_event - hotplug processing + * @dev: drm_device + * + * Drivers can use this function to run a detect cycle on all connectors which + * have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All other + * connectors are ignored, which is useful to avoid reprobing fixed panels. + * + * This function is useful for drivers which can't or don't track hotplug interrupts + * for each connector. This function is based on drm_helper_hpd_irq_event() helper + * function and besides it adds edid check routine when a connector status still + * remains as "connector_status_connected". + * + * Following scenario requires detection of changing of edid. + * 1) plug display device to a connector + * 2) system suspend + * 3) unplug 1)'s display device and plug the other display device to a connector + * 4) system resume + + * This function must be called from process context with no mode + * setting locks held. + * + * Note that a connector can be both polled and probed from the hotplug handler, + * in case the hotplug interrupt is known to be unreliable. + */ +static bool intel_hpd_irq_event(struct drm_device *dev) +{ + struct drm_connector *connector; + struct drm_connector_list_iter conn_iter; + enum drm_connector_status old_status, cur_status; + struct edid *old_edid; + bool changed = false; + + if (!dev->mode_config.poll_enabled) + return false; + + mutex_lock(&dev->mode_config.mutex); + drm_connector_list_iter_begin(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) { + /* Only handle HPD capable connectors. */ + if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) + continue; + + old_status = connector->status; + old_edid = to_intel_connector(connector)->detect_edid; + + cur_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(cur_status)); + + if (old_status != cur_status) + changed = true; + + /* Check changing of edid when a connector status still remains + * as "connector_status_connected". + */ + if (old_status == cur_status && + cur_status == connector_status_connected) { + struct edid *cur_edid = to_intel_connector(connector)->detect_edid; + if (!old_edid || !cur_edid) + continue; + + if (memcmp(old_edid, cur_edid, sizeof(*cur_edid))) { + changed = true; + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] edid updated\n", + connector->base.id, + connector->name); + } + } + } + drm_connector_list_iter_end(&conn_iter); + mutex_unlock(&dev->mode_config.mutex); + + if (changed) + drm_kms_helper_hotplug_event(dev); + + return changed; +} + static void i915_hpd_poll_init_work(struct work_struct *work) { struct drm_i915_private *dev_priv = @@ -552,7 +633,7 @@ static void i915_hpd_poll_init_work(struct work_struct *work) * in the middle of disabling polling */ if (!enabled) - drm_helper_hpd_irq_event(dev); + intel_hpd_irq_event(dev); }
/**
The hotplug detection routine of i915 uses drm_helper_hpd_irq_event(). This helper can detect changing of status of connector, but it can not detect changing of edid.
Following scenario requires detection of changing of edid.
1) plug display device to a connector 2) system suspend 3) unplug 1)'s display device and plug the other display device to a connector 4) system resume
It adds edid check routine when a connector status still remains as "connector_status_connected".
v2: Add NULL check before comparing of EDIDs.
Testcase: igt/kms_chamelium/hdmi-edid-change-during-hibernate Testcase: igt/kms_chamelium/hdmi-edid-change-during-suspend Testcase: igt/kms_chamelium/dp-edid-change-during-hibernate Testcase: igt/kms_chamelium/dp-edid-change-during-suspend
Signed-off-by: Gwan-gyeong Mun gwan-gyeong.mun@intel.com --- drivers/gpu/drm/i915/intel_hotplug.c | 84 +++++++++++++++++++++++++++- 1 file changed, 83 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c index 648a13c6043c..965f2d771fc0 100644 --- a/drivers/gpu/drm/i915/intel_hotplug.c +++ b/drivers/gpu/drm/i915/intel_hotplug.c @@ -507,6 +507,88 @@ void intel_hpd_init(struct drm_i915_private *dev_priv) } }
+/** + * intel_hpd_irq_event - hotplug processing + * @dev: drm_device + * + * Drivers can use this function to run a detect cycle on all connectors which + * have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All other + * connectors are ignored, which is useful to avoid reprobing fixed panels. + * + * This function is useful for drivers which can't or don't track hotplug interrupts + * for each connector. This function is based on drm_helper_hpd_irq_event() helper + * function and besides it adds edid check routine when a connector status still + * remains as "connector_status_connected". + * + * Following scenario requires detection of changing of edid. + * 1) plug display device to a connector + * 2) system suspend + * 3) unplug 1)'s display device and plug the other display device to a connector + * 4) system resume + + * This function must be called from process context with no mode + * setting locks held. + * + * Note that a connector can be both polled and probed from the hotplug handler, + * in case the hotplug interrupt is known to be unreliable. + */ +static bool intel_hpd_irq_event(struct drm_device *dev) +{ + struct drm_connector *connector; + struct drm_connector_list_iter conn_iter; + enum drm_connector_status old_status, cur_status; + struct edid *old_edid; + bool changed = false; + + if (!dev->mode_config.poll_enabled) + return false; + + mutex_lock(&dev->mode_config.mutex); + drm_connector_list_iter_begin(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) { + /* Only handle HPD capable connectors. */ + if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) + continue; + + old_status = connector->status; + old_edid = to_intel_connector(connector)->detect_edid; + + cur_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(cur_status)); + + if (old_status != cur_status) + changed = true; + + /* Check changing of edid when a connector status still remains + * as "connector_status_connected". + */ + if (old_status == cur_status && + cur_status == connector_status_connected) { + struct edid *cur_edid = to_intel_connector(connector)->detect_edid; + + if (!old_edid || !cur_edid) + continue; + + if (memcmp(old_edid, cur_edid, sizeof(*cur_edid))) { + changed = true; + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] edid updated\n", + connector->base.id, + connector->name); + } + } + } + drm_connector_list_iter_end(&conn_iter); + mutex_unlock(&dev->mode_config.mutex); + + if (changed) + drm_kms_helper_hotplug_event(dev); + + return changed; +} + static void i915_hpd_poll_init_work(struct work_struct *work) { struct drm_i915_private *dev_priv = @@ -552,7 +634,7 @@ static void i915_hpd_poll_init_work(struct work_struct *work) * in the middle of disabling polling */ if (!enabled) - drm_helper_hpd_irq_event(dev); + intel_hpd_irq_event(dev); }
/**
On Thu, 2018-08-09 at 14:13 +0300, Gwan-gyeong Mun wrote:
The hotplug detection routine of i915 uses drm_helper_hpd_irq_event(). This helper can detect changing of status of connector, but it can not detect changing of edid.
Following scenario requires detection of changing of edid.
- plug display device to a connector
- system suspend
- unplug 1)'s display device and plug the other display device to a
connector 4) system resume
It adds edid check routine when a connector status still remains as "connector_status_connected".
v2: Add NULL check before comparing of EDIDs.
Testcase: igt/kms_chamelium/hdmi-edid-change-during-hibernate Testcase: igt/kms_chamelium/hdmi-edid-change-during-suspend Testcase: igt/kms_chamelium/dp-edid-change-during-hibernate Testcase: igt/kms_chamelium/dp-edid-change-during-suspend
Signed-off-by: Gwan-gyeong Mun gwan-gyeong.mun@intel.com
drivers/gpu/drm/i915/intel_hotplug.c | 84 +++++++++++++++++++++++++++- 1 file changed, 83 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c index 648a13c6043c..965f2d771fc0 100644 --- a/drivers/gpu/drm/i915/intel_hotplug.c +++ b/drivers/gpu/drm/i915/intel_hotplug.c @@ -507,6 +507,88 @@ void intel_hpd_init(struct drm_i915_private *dev_priv) } }
+/**
- intel_hpd_irq_event - hotplug processing
- @dev: drm_device
- Drivers can use this function to run a detect cycle on all
connectors which
- have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member.
All other
- connectors are ignored, which is useful to avoid reprobing fixed
panels.
- This function is useful for drivers which can't or don't track
hotplug interrupts
- for each connector. This function is based on
drm_helper_hpd_irq_event() helper
- function and besides it adds edid check routine when a connector
status still
- remains as "connector_status_connected".
- Following scenario requires detection of changing of edid.
- plug display device to a connector
- system suspend
- unplug 1)'s display device and plug the other display device
to a connector
- system resume
- This function must be called from process context with no mode
- setting locks held.
- Note that a connector can be both polled and probed from the
hotplug handler,
- in case the hotplug interrupt is known to be unreliable.
- */
+static bool intel_hpd_irq_event(struct drm_device *dev) +{
- struct drm_connector *connector;
- struct drm_connector_list_iter conn_iter;
- enum drm_connector_status old_status, cur_status;
- struct edid *old_edid;
- bool changed = false;
- if (!dev->mode_config.poll_enabled)
return false;- mutex_lock(&dev->mode_config.mutex);
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter) {
/* Only handle HPD capable connectors. */if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))continue;old_status = connector->status;old_edid = to_intel_connector(connector)-detect_edid;
cur_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(cur_status));
if (old_status != cur_status)changed = true;/* Check changing of edid when a connector statusstill remains
* as "connector_status_connected".*/if (old_status == cur_status &&cur_status == connector_status_connected) {struct edid *cur_edid =to_intel_connector(connector)->detect_edid;
if (!old_edid || !cur_edid)continue;if (memcmp(old_edid, cur_edid,sizeof(*cur_edid))) {
changed = true;DRM_DEBUG_KMS("[CONNECTOR:%d:%s]edid updated\n",
connector->base.id,connector->name);}}- }
- drm_connector_list_iter_end(&conn_iter);
- mutex_unlock(&dev->mode_config.mutex);
- if (changed)
drm_kms_helper_hotplug_event(dev);- return changed;
+}
static void i915_hpd_poll_init_work(struct work_struct *work) { struct drm_i915_private *dev_priv = @@ -552,7 +634,7 @@ static void i915_hpd_poll_init_work(struct work_struct *work) * in the middle of disabling polling */ if (!enabled)
drm_helper_hpd_irq_event(dev);
intel_hpd_irq_event(dev);}
Just wondering, as I saw previously drm_helper_hpd_irq_event function was used, which basically does the same thing, except doing memcmp for detecting the edid change. Is it only Intel specific change? As we could just add this modification to existing helper function or add another helper function to the drm (drm_probe_helper.c), so that it is also usable elsewhere..
/**
On Fri, 2018-08-10 at 13:02 +0000, Lisovskiy, Stanislav wrote:
On Thu, 2018-08-09 at 14:13 +0300, Gwan-gyeong Mun wrote:
The hotplug detection routine of i915 uses drm_helper_hpd_irq_event(). This helper can detect changing of status of connector, but it can not detect changing of edid.
Following scenario requires detection of changing of edid.
1) plug display device to a connector 2) system suspend 3) unplug 1)'s display device and plug the other display device to a connector 4) system resume
It adds edid check routine when a connector status still remains as "connector_status_connected".
v2: Add NULL check before comparing of EDIDs.
Testcase: igt/kms_chamelium/hdmi-edid-change-during-hibernate Testcase: igt/kms_chamelium/hdmi-edid-change-during-suspend Testcase: igt/kms_chamelium/dp-edid-change-during-hibernate Testcase: igt/kms_chamelium/dp-edid-change-during-suspend
Signed-off-by: Gwan-gyeong Mun gwan-gyeong.mun@intel.com
drivers/gpu/drm/i915/intel_hotplug.c | 84 +++++++++++++++++++++++++++- 1 file changed, 83 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c index 648a13c6043c..965f2d771fc0 100644 --- a/drivers/gpu/drm/i915/intel_hotplug.c +++ b/drivers/gpu/drm/i915/intel_hotplug.c @@ -507,6 +507,88 @@ void intel_hpd_init(struct drm_i915_private *dev_priv) } } +/**
- intel_hpd_irq_event - hotplug processing
- @dev: drm_device
- Drivers can use this function to run a detect cycle on all
connectors which
- have the DRM_CONNECTOR_POLL_HPD flag set in their &polled
member. All other
- connectors are ignored, which is useful to avoid reprobing
fixed panels.
- This function is useful for drivers which can't or don't track
hotplug interrupts
- for each connector. This function is based on
drm_helper_hpd_irq_event() helper
- function and besides it adds edid check routine when a
connector status still
- remains as "connector_status_connected".
- Following scenario requires detection of changing of edid.
- * 1) plug display device to a connector
- * 2) system suspend
- * 3) unplug 1)'s display device and plug the other display
device to a connector
- * 4) system resume
- This function must be called from process context with no mode
- setting locks held.
- Note that a connector can be both polled and probed from the
hotplug handler,
- in case the hotplug interrupt is known to be unreliable.
- */
+static bool intel_hpd_irq_event(struct drm_device *dev) +{
- struct drm_connector *connector;
- struct drm_connector_list_iter conn_iter;
- enum drm_connector_status old_status, cur_status;
- struct edid *old_edid;
- bool changed = false;
- if (!dev->mode_config.poll_enabled)
return false;- mutex_lock(&dev->mode_config.mutex);
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter) {
/* Only handle HPD capable connectors. */if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))continue;old_status = connector->status;old_edid = to_intel_connector(connector)-detect_edid;
cur_status = drm_helper_probe_detect(connector,NULL, false);
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updatedfrom %s to %s\n",
connector->base.id, connector->name,drm_get_connector_status_name(old_stat us),
drm_get_connector_status_name(cur_stat us));
if (old_status != cur_status)changed = true;/* Check changing of edid when a connector statusstill remains
* as "connector_status_connected".*/if (old_status == cur_status &&cur_status == connector_status_connected) {struct edid *cur_edid =to_intel_connector(connector)->detect_edid;
if (!old_edid || !cur_edid)continue;if (memcmp(old_edid, cur_edid,sizeof(*cur_edid))) {
changed = true;DRM_DEBUG_KMS("[CONNECTOR:%d:%s]edid updated\n",
connector->base.id,connector->name);}}- }
- drm_connector_list_iter_end(&conn_iter);
- mutex_unlock(&dev->mode_config.mutex);
- if (changed)
drm_kms_helper_hotplug_event(dev);- return changed;
+}
static void i915_hpd_poll_init_work(struct work_struct *work) { struct drm_i915_private *dev_priv = @@ -552,7 +634,7 @@ static void i915_hpd_poll_init_work(struct work_struct *work) * in the middle of disabling polling */ if (!enabled)
drm_helper_hpd_irq_event(dev);
intel_hpd_irq_event(dev);}
Just wondering, as I saw previously drm_helper_hpd_irq_event function was used, which basically does the same thing, except doing memcmp for detecting the edid change. Is it only Intel specific change? As we could just add this modification to existing helper function or add another helper function to the drm (drm_probe_helper.c), so that it is also usable elsewhere..
I second Stanislav's proposal to add this feature as part of drm. This edid check could be part of existing drm_helper_hpd_irq_event() function. Other drivers might find this change useful.
/**
-- Best Regards,
Lisovskiy Stanislav _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
dri-devel@lists.freedesktop.org
-
Gwan-gyeong Mun -
Lisovskiy, Stanislav -
Mika Kahola