drm/i915: Enable VS timer dispatch.

This could resolve HW deadlocks where a unit downstream of the VS is
waiting for more input, the VS has one vertex queued up but not
dispatched because it hopes to get one more vertex for 2x4 dispatch,
and software isn't handing more vertices down because it's waiting for
rendering to complete.  The B-Spec says you should always have this
bit set.

Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Eric Anholt 2010-03-08 23:41:55 -08:00
parent 4967790112
commit 71cf39b117
2 changed files with 9 additions and 0 deletions

View File

@ -4725,6 +4725,11 @@ i915_gem_init_ringbuffer(struct drm_device *dev)
ring->space += ring->Size;
}
if (IS_I9XX(dev) && !IS_GEN3(dev)) {
I915_WRITE(MI_MODE,
(VS_TIMER_DISPATCH) << 16 | VS_TIMER_DISPATCH);
}
return 0;
}

View File

@ -298,6 +298,10 @@
#define INSTDONE 0x02090
#define NOPID 0x02094
#define HWSTAM 0x02098
#define MI_MODE 0x0209c
# define VS_TIMER_DISPATCH (1 << 6)
#define SCPD0 0x0209c /* 915+ only */
#define IER 0x020a0
#define IIR 0x020a4