@@ -225,7 +225,52 @@ static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
.destroy = intel_hdmi_enc_destroy,
};
-
+/*
+ * Enumerate the child dev array parsed from VBT to check whether
+ * the given HDMI is present.
+ * If it is present, return 1.
+ * If it is not present, return false.
+ * If no child dev is parsed from VBT, it assumes that the given
+ * HDMI is present.
+ */
+int hdmi_is_present_in_vbt(struct drm_device *dev, int hdmi_reg)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct child_device_config *p_child;
+ int i, hdmi_port, ret;
+
+ if (!dev_priv->child_dev_num)
+ return 1;
+
+ if (hdmi_reg == SDVOB)
+ hdmi_port = DVO_B;
+ else if (hdmi_reg == SDVOC)
+ hdmi_port = DVO_C;
+ else if (hdmi_reg == HDMIB)
+ hdmi_port = DVO_B;
+ else if (hdmi_reg == HDMIC)
+ hdmi_port = DVO_C;
+ else if (hdmi_reg == HDMID)
+ hdmi_port = DVO_D;
+ else
+ return 0;
+
+ ret = 0;
+ for (i = 0; i < dev_priv->child_dev_num; i++) {
+ p_child = dev_priv->child_dev + i;
+ /*
+ * If the device type is not HDMI, continue.
+ */
+ if (p_child->device_type != DEVICE_TYPE_HDMI)
+ continue;
+ /* Find the HDMI port */
+ if (p_child->dvo_port == hdmi_port) {
+ ret = 1;
+ break;
+ }
+ }
+ return ret;
+}
void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -233,6 +278,10 @@ void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
struct intel_output *intel_output;
struct intel_hdmi_priv *hdmi_priv;
+ if (!hdmi_is_present_in_vbt(dev, sdvox_reg)) {
+ DRM_DEBUG_KMS("HDMI is not present. Ignored it \n");
+ return;
+ }
intel_output = kcalloc(sizeof(struct intel_output) +
sizeof(struct intel_hdmi_priv), 1, GFP_KERNEL);
if (!intel_output)