usb: typec: altmodes/displayport: Add pin assignment helper

[platform/kernel/linux-starfive.git] / drivers / acpi / glue.c

diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 204fe94..a194f30 100644 (file)
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -75,7 +75,8 @@ static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
 }
 
 #define FIND_CHILD_MIN_SCORE   1
-#define FIND_CHILD_MAX_SCORE   2
+#define FIND_CHILD_MID_SCORE   2
+#define FIND_CHILD_MAX_SCORE   3
 
 static int match_any(struct acpi_device *adev, void *not_used)
 {
@@ -96,8 +97,17 @@ static int find_child_checks(struct acpi_device *adev, bool check_children)
                return -ENODEV;
 
        status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
-       if (status == AE_NOT_FOUND)
+       if (status == AE_NOT_FOUND) {
+               /*
+                * Special case: backlight device objects without _STA are
+                * preferred to other objects with the same _ADR value, because
+                * it is more likely that they are actually useful.
+                */
+               if (adev->pnp.type.backlight)
+                       return FIND_CHILD_MID_SCORE;
+
                return FIND_CHILD_MIN_SCORE;
+       }
 
        if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
                return -ENODEV;