[Intel-gfx] [PATCH] drm/i915: only hook up hpd pulse for DP outputs

[Chris Wilson]

On HSW+, the digital encoders are shared between HDMI and DP outputs,
with one encoder masquerading as both. The VBT should tell us if we need
to have DP or HDMI support on a particular port, but if we don't have DP
support and we enable the DP hpd pulse handler then we cause an oops.

Don't hook up the DP hpd handling if we don't have a DP port.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81856
Reported-by: Intel QA Team.
Signed-off-by: Dave Airlie <airlied at redhat.com> # v1
[ickle: Fix the error handling after a malloc failure]
Cc: Dave Airlie <airlied at redhat.com>
Cc: Paulo Zanoni <przanoni at gmail.com>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_ddi.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index a6024de..3634575 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1557,15 +1557,13 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
 	struct intel_digital_port *intel_dig_port;
 	struct intel_encoder *intel_encoder;
 	struct drm_encoder *encoder;
-	struct intel_connector *hdmi_connector = NULL;
-	struct intel_connector *dp_connector = NULL;
 	bool init_hdmi, init_dp;
 
 	init_hdmi = (dev_priv->vbt.ddi_port_info[port].supports_dvi ||
 		     dev_priv->vbt.ddi_port_info[port].supports_hdmi);
 	init_dp = dev_priv->vbt.ddi_port_info[port].supports_dp;
 	if (!init_dp && !init_hdmi) {
-		DRM_DEBUG_KMS("VBT says port %c is not DVI/HDMI/DP compatible\n",
+		DRM_DEBUG_KMS("VBT says port %c is not DVI/HDMI/DP compatible, assuming it is\n",
 			      port_name(port));
 		init_hdmi = true;
 		init_dp = true;
@@ -1595,23 +1593,28 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
 					   DDI_A_4_LANES);
 
 	intel_encoder->type = INTEL_OUTPUT_UNKNOWN;
-	intel_encoder->crtc_mask =  (1 << 0) | (1 << 1) | (1 << 2);
+	intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 	intel_encoder->cloneable = 0;
 	intel_encoder->hot_plug = intel_ddi_hot_plug;
 
-	intel_dig_port->hpd_pulse = intel_dp_hpd_pulse;
-	dev_priv->hpd_irq_port[port] = intel_dig_port;
+	if (init_dp) {
+		if (!intel_ddi_init_dp_connector(intel_dig_port))
+			goto err;
 
-	if (init_dp)
-		dp_connector = intel_ddi_init_dp_connector(intel_dig_port);
+		intel_dig_port->hpd_pulse = intel_dp_hpd_pulse;
+		dev_priv->hpd_irq_port[port] = intel_dig_port;
+	}
 
 	/* In theory we don't need the encoder->type check, but leave it just in
 	 * case we have some really bad VBTs... */
-	if (intel_encoder->type != INTEL_OUTPUT_EDP && init_hdmi)
-		hdmi_connector = intel_ddi_init_hdmi_connector(intel_dig_port);
-
-	if (!dp_connector && !hdmi_connector) {
-		drm_encoder_cleanup(encoder);
-		kfree(intel_dig_port);
+	if (intel_encoder->type != INTEL_OUTPUT_EDP && init_hdmi) {
+		if (!intel_ddi_init_hdmi_connector(intel_dig_port))
+			goto err;
 	}
+
+	return;
+
+err:
+	drm_encoder_cleanup(encoder);
+	kfree(intel_dig_port);
 }
-- 
1.9.1