drm/i915: Enable HDMI on DDI-E

DDI-E doesn't have the correspondent GMBUS pin.

We rely on VBT to tell us which one it being used instead.

The DVI/HDMI on shared port couldn't exist.

This patch isn't tested without hardware wchich has HDMI
on DDI-E.

v2: fix trailing whitespace
v3: MISSING_CASE take place of BUG()

Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 51cbea8247fe..dcd336bcdfe7 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1958,6 +1958,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
         struct drm_device *dev = intel_encoder->base.dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
         enum port port = intel_dig_port->port;
+        uint8_t alternate_ddc_pin;
 
         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
                            DRM_MODE_CONNECTOR_HDMIA);
@@ -1991,6 +1992,26 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
                         intel_hdmi->ddc_bus = GMBUS_PIN_DPD;
                 intel_encoder->hpd_pin = HPD_PORT_D;
                 break;
+        case PORT_E:
+                /* On SKL PORT E doesn't have seperate GMBUS pin
+                 *  We rely on VBT to set a proper alternate GMBUS pin. */
+                alternate_ddc_pin =
+                        dev_priv->vbt.ddi_port_info[PORT_E].alternate_ddc_pin;
+                switch (alternate_ddc_pin) {
+                case DDC_PIN_B:
+                        intel_hdmi->ddc_bus = GMBUS_PIN_DPB;
+                        break;
+                case DDC_PIN_C:
+                        intel_hdmi->ddc_bus = GMBUS_PIN_DPC;
+                        break;
+                case DDC_PIN_D:
+                        intel_hdmi->ddc_bus = GMBUS_PIN_DPD;
+                        break;
+                default:
+                        MISSING_CASE(alternate_ddc_pin);
+                }
+                intel_encoder->hpd_pin = HPD_PORT_E;
+                break;
         case PORT_A:
                 intel_encoder->hpd_pin = HPD_PORT_A;
                 /* Internal port only for eDP. */