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drm/i915: Don't set up the TV port if it isn't in the BIOS table.

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Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Zhao Yakui 2009-11-24 09:48:48 +08:00 committed by Eric Anholt
parent 7cf4f69d3f
commit c35614380d
1 changed files with 39 additions and 0 deletions
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39
drivers/gpu/drm/i915/intel_tv.c
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@ -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;