[Intel-gfx] [PATCH 3/3] drm/i915/icl: Delay hotplug processing for tc ports
José Roberto de Souza
jose.souza at intel.com
Thu Nov 8 00:05:54 UTC 2018
Some USB type-C dongles requires some time to power on before being
able to process aux channel transactions.
It was not a problem for older gens because there was a bridge
between DP port and USB-C controller adding some delay but ICL
handles type-C native.
So here trying to do a aux channel transaction at each 150ms for up 5
times, before giving up.
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_dp.c | 14 +++++
drivers/gpu/drm/i915/intel_drv.h | 6 ++-
drivers/gpu/drm/i915/intel_hotplug.c | 76 ++++++++++++++++++++++++++++
4 files changed, 96 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 98547c242121..85950fb1fab1 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2792,6 +2792,7 @@ enum hpd_pin intel_hpd_pin_default(struct drm_i915_private *dev_priv,
bool intel_hpd_disable(struct drm_i915_private *dev_priv, enum hpd_pin pin);
void intel_hpd_enable(struct drm_i915_private *dev_priv, enum hpd_pin pin);
void intel_hpd_suspend(struct drm_i915_private *dev_priv);
+void intel_hotplug_tc_wa_work(struct work_struct *__work);
/* i915_irq.c */
static inline void i915_queue_hangcheck(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 27c6163426d6..e9060e325109 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5307,6 +5307,7 @@ void intel_dp_encoder_destroy(struct drm_encoder *encoder)
{
struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
struct intel_dp *intel_dp = &intel_dig_port->dp;
+ struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
intel_dp_mst_encoder_cleanup(intel_dig_port);
if (intel_dp_is_edp(intel_dp)) {
@@ -5323,6 +5324,15 @@ void intel_dp_encoder_destroy(struct drm_encoder *encoder)
unregister_reboot_notifier(&intel_dp->edp_notifier);
intel_dp->edp_notifier.notifier_call = NULL;
}
+ } else {
+ /*
+ * ICL TC legacy HDMI ports is destroyed by this callback so
+ * it is necessary check if is DP before cancel delayed works
+ * as it is not initialized for legacy HDMI ports.
+ */
+ if (IS_ICELAKE(dev_priv) &&
+ intel_dig_port->base.type == INTEL_OUTPUT_DP)
+ cancel_delayed_work_sync(&intel_dp->tc_wa_work);
}
intel_dp_aux_fini(intel_dp);
@@ -6686,6 +6696,10 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
}
+ if (IS_ICELAKE(dev_priv) && !intel_dp_is_edp(intel_dp))
+ INIT_DELAYED_WORK(&intel_dp->tc_wa_work,
+ intel_hotplug_tc_wa_work);
+
return true;
fail:
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index bc30f107b430..61cfa4984c11 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1138,7 +1138,11 @@ struct intel_dp {
int panel_power_cycle_delay;
int backlight_on_delay;
int backlight_off_delay;
- struct delayed_work panel_vdd_work;
+ union {
+ struct delayed_work panel_vdd_work;
+ struct delayed_work tc_wa_work;
+ };
+ u8 tc_wa_count;
bool want_panel_vdd;
unsigned long last_power_on;
unsigned long last_backlight_off;
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
index 86b7457c6c8d..cfd469bce52c 100644
--- a/drivers/gpu/drm/i915/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/intel_hotplug.c
@@ -342,6 +342,64 @@ static void i915_digport_work_func(struct work_struct *work)
}
}
+#define TC_WA_DELAY_MSEC 150
+#define TC_WA_TRIES 5
+
+/*
+ * Test if TC dongle is responsive return true if so otherwise schedule a
+ * work to try again and return false
+ */
+static bool intel_hotplug_tc_wa_test(struct intel_dp *intel_dp)
+{
+ u8 buff;
+
+ intel_dp->tc_wa_count++;
+
+ if (drm_dp_dpcd_read(&intel_dp->aux, DP_DPCD_REV, &buff, 1) != 1)
+ goto not_responsive;
+
+ if (!drm_probe_ddc(&intel_dp->aux.ddc))
+ goto not_responsive;
+
+ return true;
+
+not_responsive:
+ if (intel_dp->tc_wa_count < TC_WA_TRIES) {
+ unsigned long delay;
+
+ delay = msecs_to_jiffies(TC_WA_DELAY_MSEC);
+ schedule_delayed_work(&intel_dp->tc_wa_work, delay);
+ } else {
+ DRM_DEBUG_KMS("TC not responsive, giving up\n");
+ }
+
+ return false;
+}
+
+void intel_hotplug_tc_wa_work(struct work_struct *__work)
+{
+ struct intel_dp *intel_dp = container_of(to_delayed_work(__work),
+ struct intel_dp, tc_wa_work);
+ struct intel_connector *intel_connector = intel_dp->attached_connector;
+ struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+ struct intel_encoder *intel_encoder = &intel_dig_port->base;
+ struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+ struct drm_device *dev = &dev_priv->drm;
+ bool ret;
+
+ if (!intel_digital_port_connected(intel_encoder))
+ return;
+
+ mutex_lock(&dev->mode_config.mutex);
+ ret = intel_hotplug_tc_wa_test(intel_dp);
+ if (ret)
+ ret = intel_encoder->hotplug(intel_encoder, intel_connector);
+ mutex_unlock(&dev->mode_config.mutex);
+
+ if (ret)
+ drm_kms_helper_hotplug_event(dev);
+}
+
/*
* Handle hotplug events outside the interrupt handler proper.
*/
@@ -377,9 +435,27 @@ static void i915_hotplug_work_func(struct work_struct *work)
continue;
intel_encoder = intel_connector->encoder;
if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
+ struct intel_digital_port *dig_port = enc_to_dig_port(&intel_encoder->base);
+
DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
connector->name, intel_encoder->hpd_pin);
+ /*
+ * TC WA: TC dongles can takes some time to be
+ * responsible, so let's try to do a DPCD read to check
+ * if it is ready, otherwise try again in a few msecs.
+ */
+ if (IS_ICELAKE(dev_priv) &&
+ intel_digital_port_connected(intel_encoder) &&
+ dig_port->tc_type != TC_PORT_LEGACY) {
+ struct intel_dp *intel_dp;
+
+ intel_dp = enc_to_intel_dp(&intel_encoder->base);
+ intel_dp->tc_wa_count = 0;
+ if (!intel_hotplug_tc_wa_test(intel_dp))
+ continue;
+ }
+
changed |= intel_encoder->hotplug(intel_encoder,
intel_connector);
}
--
2.19.1
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