Unpowered type-c dongles can take some time to boot and be
responsible, causing the probe to fail and sink never be detected
without further actions from userspace.
It was not a issue for older platforms because there was a hardware
bridge between DDI/DP ports and type-c controller adding a implicit
delay that hid this issue but ICL have type-c controllers integrated
to the SOC bring this issue to users.
So here if the probe failed when coming from a IRQ it returns
INTEL_HOTPLUG_RETRY that will schedule another run of
i915_hotplug_work_func() after 1 second what is time enough for
those type-c dongles to boot.
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_ddi.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 1676a87f18cb..96bbcf5c9787 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -4056,6 +4056,8 @@ intel_ddi_hotplug(struct intel_encoder *encoder,
struct intel_connector *connector,
bool irq_received)
{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
struct drm_modeset_acquire_ctx ctx;
enum intel_hotplug_state state;
int ret;
@@ -4082,6 +4084,17 @@ intel_ddi_hotplug(struct intel_encoder *encoder,
drm_modeset_acquire_fini(&ctx);
WARN(ret, "Acquiring modeset locks failed with %i\n", ret);
+ /*
+ * Unpowered type-c dongles can take some time to boot and be
+ * responsible, so here giving some type to those dongles to power up
+ * and then retrying the probe.
+ */
+ if (state == INTEL_HOTPLUG_NOCHANGE &&
+ connector->base.status != connector_status_connected &&
+ irq_received && intel_port_is_tc(dev_priv, encoder->port) &&
+ !dig_port->tc_legacy_port && !dig_port->dp.is_mst)
+ state = INTEL_HOTPLUG_RETRY;
+
return state;
}
--
2.20.1
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