drm/i915: only hook up hpd pulse for DP outputs

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@redhat.com> # v1
[ickle: Fix the error handling after a malloc failure]
Reviewed-by: Dave Airlie <airlied@redhat.com>
Cc: Paulo Zanoni <przanoni@gmail.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 9b1542f1cf01e7bbf2688de6e8b1ae722d48656f..2d73430a0d271a97ff0b829d08d6c187d00418f5 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1515,15 +1515,13 @@ 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;
@@ -1553,23 +1551,28 @@ 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);
 }