]> git.karo-electronics.de Git - linux-beck.git/commit
PCI: Add quirk for still enabled interrupts on Intel Sandy Bridge GPUs
authorThomas Jarosch <thomas.jarosch@intra2net.com>
Wed, 7 Dec 2011 21:08:11 +0000 (22:08 +0100)
committerJesse Barnes <jbarnes@virtuousgeek.org>
Tue, 14 Feb 2012 16:45:26 +0000 (08:45 -0800)
commitf67fd55fa96f7d7295b43ffbc4a97d8f55e473aa
tree93f18189c8b1d944e2433d9bfb70a1f67b4148a5
parent3209874a1da2c51c7325e601d9634189ee178ad6
PCI: Add quirk for still enabled interrupts on Intel Sandy Bridge GPUs

Some BIOS implementations leave the Intel GPU interrupts enabled,
even though no one is handling them (f.e. i915 driver is never loaded).
Additionally the interrupt destination is not set up properly
and the interrupt ends up -somewhere-.

These spurious interrupts are "sticky" and the kernel disables
the (shared) interrupt line after 100.000+ generated interrupts.

Fix it by disabling the still enabled interrupts.
This resolves crashes often seen on monitor unplug.

Tested on the following boards:
- Intel DH61CR: Affected
- Intel DH67BL: Affected
- Intel S1200KP server board: Affected
- Asus P8H61-M LE: Affected, but system does not crash.
  Probably the IRQ ends up somewhere unnoticed.

According to reports on the net, the Intel DH61WW board is also affected.

Many thanks to Jesse Barnes from Intel for helping
with the register configuration and to Intel in general
for providing public hardware documentation.

Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com>
Tested-by: Charlie Suffin <charlie.suffin@stratus.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
drivers/pci/quirks.c