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

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We not only check the device type, but also check the addin_offset. If the
addin_offset is zero, it won't be initialized.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
[anholt: hand-applied due to conflicts]
This commit is contained in:
Zhao Yakui 2009-11-24 09:48:47 +08:00 committed by Eric Anholt
parent ae266c98f5
commit 7cf4f69d3f
1 changed files with 44 additions and 0 deletions
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44
drivers/gpu/drm/i915/intel_lvds.c
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@ -968,6 +968,46 @@ static void intel_find_lvds_downclock(struct drm_device *dev,
return; return;
} }
/*
* Enumerate the child dev array parsed from VBT to check whether
* the LVDS 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 LVDS is present.
* Note: The addin_offset should also be checked for LVDS panel.
* Only when it is non-zero, it is assumed that it is present.
*/
int lvds_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 LFP, continue.
* If the device type is 0x22, it is also regarded as LFP.
*/
if (p_child->device_type != DEVICE_TYPE_INT_LFP &&
p_child->device_type != DEVICE_TYPE_LFP)
continue;
/* The addin_offset should be checked. Only when it is
* non-zero, it is regarded as present.
*/
if (p_child->addin_offset) {
ret = 1;
break;
}
}
return ret;
}
/** /**
* intel_lvds_init - setup LVDS connectors on this device * intel_lvds_init - setup LVDS connectors on this device
* @dev: drm device * @dev: drm device
@ -991,6 +1031,10 @@ void intel_lvds_init(struct drm_device *dev)
if (dmi_check_system(intel_no_lvds)) if (dmi_check_system(intel_no_lvds))
return; return;
if (!lvds_is_present_in_vbt(dev)) {
DRM_DEBUG_KMS("LVDS is not present in VBT\n");
return;
}
/* Assume that any device without an ACPI LID device also doesn't /* Assume that any device without an ACPI LID device also doesn't
* have an integrated LVDS. We would be better off parsing the BIOS * have an integrated LVDS. We would be better off parsing the BIOS
* to get a reliable indicator, but that code isn't written yet. * to get a reliable indicator, but that code isn't written yet.