[PATCH 6/9] drm/i915/dp: Add support for out-of-bound hotplug events

Hans de Goede
2021-05-03T15:47:20Z

On some Cherry Trail devices, DisplayPort over Type-C is supported through
a USB-PD microcontroller (e.g. a fusb302) + a mux to switch the superspeed
datalines between USB-3 and DP (e.g. a pi3usb30532). The kernel in this
case does the PD/alt-mode negotiation itself, rather then everything being
handled in firmware.

So the kernel itself picks an alt-mode, tells the Type-C "dongle" to switch
to DP mode and sets the mux accordingly. In this setup the HPD pin is not
connected, so the i915 driver needs to respond to a software event and scan
the DP port for changes manually.

This commit adds support for this. Together with the recent addition of
DP alt-mode support to the Type-C subsystem this makes DP over Type-C
work on these devices.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/gpu/drm/i915/display/intel_dp.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 64a73b3ced94..1029720cc945 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5846,6 +5846,18 @@ static int intel_dp_connector_atomic_check(struct drm_connector *conn,
return intel_modeset_synced_crtcs(state, conn);
}

+static void intel_dp_oob_hotplug_event(struct drm_connector *connector,
+ struct drm_connector_oob_hotplug_event_data *data)
+{
+ struct intel_encoder *encoder = intel_attached_encoder(to_intel_connector(connector));
+ struct drm_i915_private *i915 = to_i915(connector->dev);
+
+ spin_lock_irq(&i915->irq_lock);
+ i915->hotplug.event_bits |= BIT(encoder->hpd_pin);
+ spin_unlock_irq(&i915->irq_lock);
+ queue_delayed_work(system_wq, &i915->hotplug.hotplug_work, 0);
+}
+
static const struct drm_connector_funcs intel_dp_connector_funcs = {
.force = intel_dp_force,
.fill_modes = drm_helper_probe_single_connector_modes,
@@ -5856,6 +5868,7 @@ static const struct drm_connector_funcs intel_dp_connector_funcs = {
.destroy = intel_connector_destroy,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
.atomic_duplicate_state = intel_digital_connector_duplicate_state,
+ .oob_hotplug_event = intel_dp_oob_hotplug_event,
};

static const struct drm_connector_helper_funcs intel_dp_connector_helper_funcs = {
--
2.31.1