summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/intel_lvds.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/i915/intel_lvds.c')
-rw-r--r--drivers/gpu/drm/i915/intel_lvds.c74
1 files changed, 72 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 9564ca44a977..9ab38efffecf 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -36,6 +36,7 @@
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"
+#include <linux/acpi.h>
#define I915_LVDS "i915_lvds"
@@ -252,14 +253,14 @@ static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
/* Should never happen!! */
if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
- printk(KERN_ERR "Can't support LVDS on pipe A\n");
+ DRM_ERROR("Can't support LVDS on pipe A\n");
return false;
}
/* Should never happen!! */
list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
- printk(KERN_ERR "Can't enable LVDS and another "
+ DRM_ERROR("Can't enable LVDS and another "
"encoder on the same pipe\n");
return false;
}
@@ -788,6 +789,65 @@ static const struct dmi_system_id intel_no_lvds[] = {
{ } /* 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)
+ */
+static acpi_status
+check_lid_device(acpi_handle handle, u32 level, void *context,
+ void **return_value)
+{
+ 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;
+
+ return AE_OK;
+}
+
+/**
+ * check whether there exists the ACPI LID device by enumerating the ACPI
+ * device tree.
+ */
+static int intel_lid_present(void)
+{
+ int lid_present = 0;
+
+ if (acpi_disabled) {
+ /* If ACPI is disabled, there is no ACPI device tree to
+ * check, so assume the LID device would have been present.
+ */
+ return 1;
+ }
+
+ 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;
+}
+#endif
+
/**
* intel_lvds_init - setup LVDS connectors on this device
* @dev: drm device
@@ -811,6 +871,16 @@ void intel_lvds_init(struct drm_device *dev)
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())
+ return;
+
if (IS_IGDNG(dev)) {
if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
return;