[PATCH 4/7] drm/i915/icl: Release TC ports when unloading or suspending driver

[José Roberto de Souza]

When suspending or unloading the driver, it needs to release the
TC ports so HW can change it state without wait for driver handshake.

Cc: Imre Deak <imre.deak at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c      |  1 +
 drivers/gpu/drm/i915/i915_drv.h      |  1 +
 drivers/gpu/drm/i915/i915_irq.c      |  1 +
 drivers/gpu/drm/i915/intel_dp.c      | 19 +++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h     |  1 +
 drivers/gpu/drm/i915/intel_hotplug.c |  9 +++++++++
 6 files changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index acb516308262..14331c396278 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1911,6 +1911,7 @@ static int i915_drm_suspend(struct drm_device *dev)
 
 	intel_runtime_pm_disable_interrupts(dev_priv);
 	intel_hpd_cancel_work(dev_priv);
+	intel_hpd_suspend(dev_priv);
 
 	intel_suspend_encoders(dev_priv);
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 2a88a7eb871b..774010f34c15 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2789,6 +2789,7 @@ enum hpd_pin intel_hpd_pin_default(struct drm_i915_private *dev_priv,
 				   enum port port);
 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);
 
 /* i915_irq.c */
 static inline void i915_queue_hangcheck(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 5d1f53723388..84de2940c167 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -4989,6 +4989,7 @@ void intel_irq_uninstall(struct drm_i915_private *dev_priv)
 {
 	drm_irq_uninstall(&dev_priv->drm);
 	intel_hpd_cancel_work(dev_priv);
+	intel_hpd_suspend(dev_priv);
 	dev_priv->runtime_pm.irqs_enabled = false;
 }
 
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2b090609bee2..3aed7e1db587 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5043,6 +5043,25 @@ bool intel_digital_port_connected(struct intel_encoder *encoder)
 	return false;
 }
 
+/*
+ * intel_digital_port_force_disconnection - Used to force port disconnection or
+ * release any control from display driver before going to a state that driver
+ * will not handle interruptions.
+ */
+void intel_digital_port_force_disconnection(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_digital_port *dig_port;
+
+	dig_port = enc_to_dig_port(&encoder->base);
+	/* Skip fake MST ports */
+	if (!dig_port)
+		return;
+
+	if (INTEL_GEN(dev_priv) >= 11)
+		icl_tc_phy_disconnect(dev_priv, dig_port);
+}
+
 static struct edid *
 intel_dp_get_edid(struct intel_dp *intel_dp)
 {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 6772e9974751..bc30f107b430 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1851,6 +1851,7 @@ bool intel_dp_read_dpcd(struct intel_dp *intel_dp);
 int intel_dp_link_required(int pixel_clock, int bpp);
 int intel_dp_max_data_rate(int max_link_clock, int max_lanes);
 bool intel_digital_port_connected(struct intel_encoder *encoder);
+void intel_digital_port_force_disconnection(struct intel_encoder *encoder);
 
 /* intel_dp_aux_backlight.c */
 int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector);
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
index 648a13c6043c..96c3c5b730f3 100644
--- a/drivers/gpu/drm/i915/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/intel_hotplug.c
@@ -635,3 +635,12 @@ void intel_hpd_enable(struct drm_i915_private *dev_priv, enum hpd_pin pin)
 	dev_priv->hotplug.stats[pin].state = HPD_ENABLED;
 	spin_unlock_irq(&dev_priv->irq_lock);
 }
+
+void intel_hpd_suspend(struct drm_i915_private *dev_priv)
+{
+	struct drm_device *dev = &dev_priv->drm;
+	struct intel_encoder *encoder;
+
+	for_each_intel_encoder(dev, encoder)
+		intel_digital_port_force_disconnection(encoder);
+}
-- 
2.19.1