vgaarb: Factor out EFI and fallback default device selection
authorBjorn Helgaas <bhelgaas@google.com>
Fri, 13 Oct 2017 03:47:29 +0000 (22:47 -0500)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Wed, 18 Oct 2017 08:04:56 +0000 (10:04 +0200)
commit505a1b571711a977b7d069dec3c14381521e9683
tree8b74843c99dda03db00dec7b4f59ccfe1da49f64
parenta37c0f48950b56f6ef2ee637ba597855504e3056
vgaarb: Factor out EFI and fallback default device selection

The default VGA device is normally set in vga_arbiter_add_pci_device() when
we call it for the first enabled device that can be accessed with the
legacy VGA resources ([mem 0xa0000-0xbffff], etc.)

That default device can be overridden by an EFI device that owns the boot
framebuffer.  As a fallback, we can also select a VGA device that can't be
accessed via legacy VGA resources, or a VGA device that isn't even enabled.

Factor out this EFI and fallback selection from vga_arb_device_init() into
a separate vga_arb_select_default_device() function.  This doesn't change
any behavior, but it untangles the "bridge control possible" checking and
messages from the default device selection.

Tested-by: Zhou Wang <wangzhou1@hisilicon.com> # D05 Hisi Hip07, Hip08
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171013034729.14630.30419.stgit@bhelgaas-glaptop.roam.corp.google.com
drivers/gpu/vga/vgaarb.c