diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_tv.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_tv.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c index d7465ca27b9..9325dff21c0 100644 --- a/drivers/gpu/drm/i915/intel_tv.c +++ b/drivers/gpu/drm/i915/intel_tv.c @@ -1699,6 +1699,41 @@ static const struct drm_encoder_funcs intel_tv_enc_funcs = { .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 @@ intel_tv_init(struct drm_device *dev) 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; |