gma: Add option to keep port power after Scan_Ports()
This is useful when we only want to probe for connected displays while
another entity currently controls the outputs.
Also introduce an `All_Ports` list, that can be used when it's unknown
which ports are actually implemented (the default now, when no port
list is provided to `Scan_Ports()`).
Change-Id: I5d8e289a907fe99c673084afbce54da65ba98e9c
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/18123
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
2 files changed