SAUCE: Bug#891270 drm/i915: add multi-threaded forcewake support
From: Manoj Iyer <email@example.com>
Please consider the following sauce patch to Oneiric.
Ivybridge system fails to resume from S3/S4 with recent BIOS. On system resume causes kernel oops in i915 driver.
Upstream fixed the issue by adding multi-threaded forcewake support.
On IVB C0+ with newer BIOSes, the forcewake handshake has changed. There's
now a bitfield for different driver components to keep the GT powered
on. On Linux, we centralize forcewake handling in one place, so we
still just need a single bit, but we need to use the new registers if MT
forcewake is enabled.
This patch was tested on Ivybridge system with the kernel posted at http://kernel.ubuntu.com/~sarvatt/fdo42923/ and the test results are noted in comment #3 in this bug, and also reported the same to https://bugs.freedesktop.org/show_bug.cgi?id=42923
The following changes since commit f0bba7483b90dabcf025dc923e0722f5ff9b5e6d:
UBUNTU: SAUCE: drm/i915: add multi-threaded forcewake support (2011-11-21 11:37:20 -0600)
are available in the git repository at:
Manoj Iyer (1):
UBUNTU: SAUCE: drm/i915: add multi-threaded forcewake support