[PATCH 0/4] Allow non-legacy cards to be vgaarb default
dja at axtens.net
Wed Jul 19 11:55:48 AEST 2017
Apologies everyone - this got mixed in with another patch set. I'll do a
v2 that isn't completely broken and confusing.
Again, my apologies for the noise.
Daniel Axtens <dja at axtens.net> writes:
> Hi all,
> Previously I posted a patch that provided a quirk for a hibmc card
> behind a particular Huawei bridge that allowed it to be marked as the
> default device in the VGA arbiter. This lead to some discussion.
> It was broadly suggested that a more generic solution would be better,
> something in the style of powerpc's fixup_vga() quirk.
> Here is my suggested solution:
> - Create a Kconfig option ARCH_WANT_VGA_ARB_FALLBACK
> - if an arch selects that option, install PCI_FIXUP_CLASS_ENABLE
> hook. This hook fires when a card is enabled, which will require
> that a driver has been bound.
> - if there is no default device when the hook fires, and the device
> can control memory and I/O, mark it as default.
> The patches are as follows:
> (1) powerpc: simplify and fix VGA default device behaviour
> This cleans up some quirks in the powerpc implementation of the
> vga_fixup. It should make the behaviour match the original
> (2) vgaarb: allow non-legacy cards to be marked as default
> Add the Kconfig option, and create the fixup in vgaarb.c gated
> behind the option. Nothing happens at this stage because no arch
> has selected the option yet.
> (3) powerpc: replace vga_fixup() with generic code
> Select the option on powerpc and remove the old code. The only
> change is that it moves from being a final fixup to an enable
> (4) arm64: allow non-legacy VGA devices to be default
> Select the option on arm64. This solves my problem with the D05,
> but may cause other cards to be marked as default on other
> boards. This shouldn't cause any real issues but is worth being
> aware of.
> : https://patchwork.ozlabs.org/patch/787003/
> : https://www.spinics.net/lists/arm-kernel/msg593656.html
> Daniel Axtens (4):
> powerpc: simplify and fix VGA default device behaviour
> vgaarb: allow non-legacy cards to be marked as default
> powerpc: replace vga_fixup() with generic code
> arm64: allow non-legacy VGA devices to be default
> arch/arm64/Kconfig | 1 +
> arch/powerpc/Kconfig | 1 +
> arch/powerpc/kernel/pci-common.c | 12 ------------
> drivers/gpu/vga/Kconfig | 7 +++++++
> drivers/gpu/vga/vgaarb.c | 21 +++++++++++++++++++++
> 5 files changed, 30 insertions(+), 12 deletions(-)
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