[PATCH 3/3] drm/i915: Implement Link Rate fallback on Link training failure
Manasi Navare
manasi.d.navare at intel.com
Wed Nov 30 07:30:33 UTC 2016
If link training at a link rate optimal for a particular
mode fails during modeset's atomic commit phase, then we
let the modeset complete and then retry. We save the link rate
value at which link training failed, update the link status property
to "BAD" and use a lower link rate to prune the modes. It will redo
the modeset on the current mode at lower link rate or if the current
mode gets pruned due to lower link constraints then, it will send a
hotplug uevent for userspace to handle it.
This is also required to pass DP CTS tests 4.3.1.3, 4.3.1.4,
4.3.1.6.
v9:
* Use the trimmed max values of link rate/lane count based on
link train fallback (Daniel Vetter)
v8:
* Set link_status to BAD first and then call mode_valid (Jani Nikula)
v7:
Remove the redundant variable in previous patch itself
v6:
* Obtain link rate index from fallback_link_rate using
the helper intel_dp_link_rate_index (Jani Nikula)
* Include fallback within intel_dp_start_link_train (Jani Nikula)
v5:
* Move set link status to drm core (Daniel Vetter, Jani Nikula)
v4:
* Add fallback support for non DDI platforms too
* Set connector->link status inside set_link_status function
(Jani Nikula)
v3:
* Set link status property to BAd unconditionally (Jani Nikula)
* Dont use two separate variables link_train_failed and link_status
to indicate same thing (Jani Nikula)
v2:
* Squashed a few patches (Jani Nikula)
Acked-by: Tony Cheng <tony.cheng at amd.com>
Acked-by: Harry Wentland <Harry.wentland at amd.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 44 +++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_dp_link_training.c | 25 +++++++++++++--
drivers/gpu/drm/i915/intel_drv.h | 3 ++
3 files changed, 70 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index bc1268c..a50b6cd 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4435,6 +4435,8 @@ static bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
intel_dp->compliance_test_active = 0;
intel_dp->compliance_test_type = 0;
intel_dp->compliance_test_data = 0;
+ intel_dp->fallback_link_rate = 0;
+ intel_dp->fallback_lane_count = 0;
if (intel_dp->is_mst) {
DRM_DEBUG_KMS("MST device may have disappeared %d vs %d\n",
@@ -4526,6 +4528,13 @@ static bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
connector->base.id, connector->name);
+ /* If this is a retry due to link training failure
+ * then do no do a full detect
+ */
+ if (status == connector_status_connected &&
+ intel_dp->fallback_lane_count)
+ return status;
+
/* If full detect is not performed yet, do a full detect */
if (!intel_dp->detect_done)
status = intel_dp_long_pulse(intel_dp->attached_connector);
@@ -5690,6 +5699,37 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
return false;
}
+static void intel_dp_modeset_retry_work_fn(struct work_struct *work)
+{
+ struct intel_connector *intel_connector;
+ struct drm_connector *connector;
+ struct drm_display_mode *mode;
+ bool verbose_prune = true;
+
+ intel_connector = container_of(work, typeof(*intel_connector),
+ modeset_retry_work);
+ connector = &intel_connector->base;
+ DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
+ connector->name);
+
+ /* Grab the locks before changing connector property*/
+ mutex_lock(&connector->dev->mode_config.mutex);
+ /* Set connector link status to BAD and send a Uevent to notify
+ * userspace to do a modeset.
+ */
+ drm_mode_connector_set_link_status_property(connector,
+ DRM_MODE_LINK_STATUS_BAD);
+ list_for_each_entry(mode, &connector->modes, head) {
+ mode->status = intel_dp_mode_valid(connector,
+ mode);
+ }
+ drm_mode_prune_invalid(connector->dev, &connector->modes,
+ verbose_prune);
+ mutex_unlock(&connector->dev->mode_config.mutex);
+ /* Send Hotplug uevent so userspace can reprobe */
+ drm_kms_helper_hotplug_event(connector->dev);
+}
+
bool
intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
struct intel_connector *intel_connector)
@@ -5702,6 +5742,10 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
enum port port = intel_dig_port->port;
int type;
+ /* Initialize the work for modeset in case of link train failure */
+ INIT_WORK(&intel_connector->modeset_retry_work,
+ intel_dp_modeset_retry_work_fn);
+
if (WARN(intel_dig_port->max_lanes < 1,
"Not enough lanes (%d) for DP on port %c\n",
intel_dig_port->max_lanes, port_name(port)))
diff --git a/drivers/gpu/drm/i915/intel_dp_link_training.c b/drivers/gpu/drm/i915/intel_dp_link_training.c
index 0048b52..cb28788 100644
--- a/drivers/gpu/drm/i915/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/intel_dp_link_training.c
@@ -313,6 +313,27 @@ void intel_dp_stop_link_train(struct intel_dp *intel_dp)
void
intel_dp_start_link_train(struct intel_dp *intel_dp)
{
- intel_dp_link_training_clock_recovery(intel_dp);
- intel_dp_link_training_channel_equalization(intel_dp);
+ struct intel_connector *intel_connector = intel_dp->attached_connector;
+
+ if (!intel_dp_link_training_clock_recovery(intel_dp))
+ goto failure_handling;
+ if (!intel_dp_link_training_channel_equalization(intel_dp))
+ goto failure_handling;
+
+ /* Reset the Link Train Values */
+ DRM_DEBUG_KMS("Link Training Passed at Link Rate = %d, Lane count = %d",
+ intel_dp->link_rate, intel_dp->lane_count);
+ intel_dp->fallback_link_rate = 0;
+ intel_dp->fallback_lane_count = 0;
+ return;
+
+ failure_handling:
+ DRM_DEBUG_KMS("Link Training failed at link rate = %d, lane count = %d",
+ intel_dp->link_rate, intel_dp->lane_count);
+ if (!intel_dp_get_link_train_fallback_values(intel_dp,
+ intel_dp->link_rate,
+ intel_dp->lane_count))
+ /* Schedule a Hotplug Uevent to userspace to start modeset */
+ schedule_work(&intel_connector->modeset_retry_work);
+ return;
}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 2da3b40..d95a51e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -315,6 +315,9 @@ struct intel_connector {
void *port; /* store this opaque as its illegal to dereference it */
struct intel_dp *mst_port;
+
+ /* Work struct to schedule a uevent on link train failure */
+ struct work_struct modeset_retry_work;
};
struct dpll {
--
1.9.1
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