drm/i915: Fix gen6 (SNB) missed BLT ring interrupts.

The failure appeared in dmesg as:

[drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt
ring idle [waiting on 35064155, at 35064155], missed IRQ?

This works around that problem on by making the blitter command
streamer write interrupt state to the Hardware Status Page when a
MI_USER_INTERRUPT command is decoded, which appears to force the seqno
out to memory before the interrupt happens.

v1->v2: Moved to prior interrupt handler installation and RMW flags as
per feedback.
v2->v3: Removed RMW of flags (by anholt)

Cc: [email protected]
Signed-off-by: Daniel J Blueman <[email protected]>
Signed-off-by: Eric Anholt <[email protected]>
Tested-by: Chris Wilson <[email protected]> [v1]
Tested-by: Eric Anholt <[email protected]> [v1,v3]
	   (incidence of the bug with a testcase went from avg 2/1000 to
	   0/12651 in the latest test run (plus more for v1))
Tested-by: Kenneth Graunke <[email protected]> [v1]
Tested-by: Robert Hooker <[email protected]> [v1]
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=33394
Signed-off-by: Dave Airlie <[email protected]>

0 files changed, 0 insertions, 0 deletions