drm/i915: Don't set up the TV port if it isn't in the BIOS table.
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index d7465ca..9325dff 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1699,6 +1699,41 @@
.destroy = intel_tv_enc_destroy,
};
+/*
+ * Enumerate the child dev array parsed from VBT to check whether
+ * the integrated TV 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 TV is present.
+ */
+int tv_is_present_in_vbt(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct child_device_config *p_child;
+ int i, ret;
+
+ if (!dev_priv->child_dev_num)
+ return 1;
+
+ 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 TV, continue.
+ */
+ if (p_child->device_type != DEVICE_TYPE_INT_TV &&
+ p_child->device_type != DEVICE_TYPE_TV)
+ continue;
+ /* Only when the addin_offset is non-zero, it is regarded
+ * as present.
+ */
+ if (p_child->addin_offset) {
+ ret = 1;
+ break;
+ }
+ }
+ return ret;
+}
void
intel_tv_init(struct drm_device *dev)
@@ -1714,6 +1749,10 @@
if ((I915_READ(TV_CTL) & TV_FUSE_STATE_MASK) == TV_FUSE_STATE_DISABLED)
return;
+ if (!tv_is_present_in_vbt(dev)) {
+ DRM_DEBUG_KMS("Integrated TV is not present.\n");
+ return;
+ }
/* Even if we have an encoder we may not have a connector */
if (!dev_priv->int_tv_support)
return;