[PATCH 2/4] drm/i915/hdmi: Read the HPD status before trying to read the EDID

[Damien Lespiau <damien.lespiau@gmail.com>]

From: Damien Lespiau <damien.lespiau@intel.com>

If you unplug the hdmi connector slowly enough, the hotplug interrupt
fires but then the kernel code tries to read the EDID and succeeds
(because the connector is still half connected, the HPD pin is shorter
than the others, and DDC works). Since EDID succeeds it thinks the
monitor is still connected.

To prevent that, read the live HPD status in the hotplug handler before
trying to read the EDID.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=55372
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 33 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h     |  3 +++
 drivers/gpu/drm/i915/intel_hdmi.c    | 10 ++++++++--
 3 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 115bf62..117d9e6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -994,6 +994,39 @@ void intel_wait_for_pipe_off(struct drm_device *dev, int pipe)
 	}
 }
 
+/*
+ * intel_ironlake_digital_port_connected - is the specified port connected?
+ * @dev_priv: i915 private structure
+ * @port: the port to test
+ *
+ * Returns true if @port is connected, false otherwise.
+ */
+bool intel_ironlake_digital_port_connected(struct drm_i915_private *dev_priv,
+					   struct intel_digital_port *port)
+{
+	u32 bit;
+
+	/* XXX: IBX has different SDEISR bits */
+	if (HAS_PCH_IBX(dev_priv->dev))
+		return true;
+
+	switch(port->port) {
+	case PORT_B:
+		bit = SDE_PORTB_HOTPLUG_CPT;
+		break;
+	case PORT_C:
+		bit = SDE_PORTC_HOTPLUG_CPT;
+		break;
+	case PORT_D:
+		bit = SDE_PORTD_HOTPLUG_CPT;
+		break;
+	default:
+		return true;
+	}
+
+	return I915_READ(SDEISR) & bit;
+}
+
 static const char *state_string(bool enabled)
 {
 	return enabled ? "on" : "off";
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 22728f2..0e069d8 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -545,6 +545,9 @@ hdmi_to_dig_port(struct intel_hdmi *intel_hdmi)
 	return container_of(intel_hdmi, struct intel_digital_port, hdmi);
 }
 
+bool intel_ironlake_digital_port_connected(struct drm_i915_private *dev_priv,
+					   struct intel_digital_port *port);
+
 extern void intel_connector_attach_encoder(struct intel_connector *connector,
 					   struct intel_encoder *encoder);
 extern struct drm_encoder *intel_best_encoder(struct drm_connector *connector);
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 53df0a8..966efef5 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -793,16 +793,22 @@ static bool g4x_hdmi_connected(struct intel_hdmi *intel_hdmi)
 static enum drm_connector_status
 intel_hdmi_detect(struct drm_connector *connector, bool force)
 {
+	struct drm_device *dev = connector->dev;
 	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
 	struct intel_digital_port *intel_dig_port =
 		hdmi_to_dig_port(intel_hdmi);
 	struct intel_encoder *intel_encoder = &intel_dig_port->base;
-	struct drm_i915_private *dev_priv = connector->dev->dev_private;
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct edid *edid;
 	enum drm_connector_status status = connector_status_disconnected;
 
-	if (IS_G4X(connector->dev) && !g4x_hdmi_connected(intel_hdmi))
+
+	if (IS_G4X(dev) && !g4x_hdmi_connected(intel_hdmi))
 		return status;
+	else if (HAS_PCH_SPLIT(dev) &&
+		 !intel_ironlake_digital_port_connected(dev_priv,
+							intel_dig_port))
+		 return status;
 
 	intel_hdmi->has_hdmi_sink = false;
 	intel_hdmi->has_audio = false;
-- 
1.7.11.7