diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lvds.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index f65044b1647..9ab38efffec 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" @@ -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; |