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From: Greg KH on 6 Aug 2010 15:10
2.6.32-stable review patch. If anyone has any objections, please let us know.

------------------

Combined patches from 2.6.33 for fixing LVDS detection.
7cf4f69d3f4511f443473954456cb91d5514756d
drm/i915: Don't set up the LVDS if it isn't in the BIOS device table.
38b3037ee47fbd65a36bc7c39f60a900fbbe3b8e
drm/i915: Fix LVDS presence check
6e36595a2131e7ed5ee2674be54b2713ba7f0490
drm/i915: Declare the new VBT parsing functions as static
11ba159288f1bfc1a475c994e598f5fe423fde9d
drm/i915: Don't check for lid presence when detecting LVDS

Acked-by: Takashi Iwai <tiwai(a)suse.de>
Cc: Matthew Garrett <mjg(a)redhat.com>
Cc: Adam Jackson <ajax(a)redhat.com>
Cc: Eric Anholt <eric(a)anholt.net>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
drivers/gpu/drm/i915/intel_lvds.c | 90 +++++++++++++-------------------------
1 file changed, 33 insertions(+), 57 deletions(-)

--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -901,64 +901,45 @@ static const struct dmi_system_id intel_
{ } /* terminating entry */
};

-#ifdef CONFIG_ACPI
/*
- * check_lid_device -- check whether @handle is an ACPI LID device.
- * @handle: ACPI device handle
- * @level : depth in the ACPI namespace tree
- * @context: the number of LID device when we find the device
- * @rv: a return value to fill if desired (Not use)
+ * 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.
*/
-static acpi_status
-check_lid_device(acpi_handle handle, u32 level, void *context,
- void **return_value)
+static int lvds_is_present_in_vbt(struct drm_device *dev)
{
- struct acpi_device *acpi_dev;
- int *lid_present = context;
-
- acpi_dev = NULL;
- /* Get the acpi device for device handle */
- if (acpi_bus_get_device(handle, &acpi_dev) || !acpi_dev) {
- /* If there is no ACPI device for handle, return */
- return AE_OK;
- }
-
- if (!strncmp(acpi_device_hid(acpi_dev), "PNP0C0D", 7))
- *lid_present = 1;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct child_device_config *p_child;
+ int i, ret;

- return AE_OK;
-}
+ if (!dev_priv->child_dev_num)
+ return 1;

-/**
- * check whether there exists the ACPI LID device by enumerating the ACPI
- * device tree.
- */
-static int intel_lid_present(void)
-{
- int lid_present = 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 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;

- if (acpi_disabled) {
- /* If ACPI is disabled, there is no ACPI device tree to
- * check, so assume the LID device would have been present.
+ /* The addin_offset should be checked. Only when it is
+ * non-zero, it is regarded as present.
*/
- return 1;
+ if (p_child->addin_offset) {
+ ret = 1;
+ break;
+ }
}
-
- acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
- ACPI_UINT32_MAX,
- check_lid_device, &lid_present, NULL);
-
- return lid_present;
-}
-#else
-static int intel_lid_present(void)
-{
- /* In the absence of ACPI built in, assume that the LID device would
- * have been present.
- */
- return 1;
+ return ret;
}
-#endif

/**
* intel_lvds_init - setup LVDS connectors on this device
@@ -983,15 +964,10 @@ void intel_lvds_init(struct drm_device *
if (dmi_check_system(intel_no_lvds))
return;

- /* Assume that any device without an ACPI LID device also doesn't
- * have an integrated LVDS. We would be better off parsing the BIOS
- * to get a reliable indicator, but that code isn't written yet.
- *
- * In the case of all-in-one desktops using LVDS that we've seen,
- * they're using SDVO LVDS.
- */
- if (!intel_lid_present())
+ if (!lvds_is_present_in_vbt(dev)) {
+ DRM_DEBUG_KMS("LVDS is not present in VBT\n");
return;
+ }

if (IS_IGDNG(dev)) {
if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)


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