Panels using a PWM-controlled backlight source without an do not have a...
standard way to communicate their valid PWM ranges.
On x86 the ranges are read from ACPI through driver-specific tables.
The built-in ranges are not necessarily correct, or may grow stale if an
older device can be retrofitted with newer panels.
Add a quirk infrastructure with which the valid backlight ranges can be
maintained as part of the kernel.
Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
---
+EXPORT_SYMBOL(drm_get_panel_backlight_quirk);
+
+MODULE_LICENSE("GPL");