diff options
| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2010-08-04 21:22:10 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-26 16:43:33 -0700 |
| commit | 46e21869656d0e3d2a2949a8451cb03a6c75c5ee (patch) | |
| tree | 57fb7ae52f3545f5cbf23837e55cb8ddb943506b /drivers | |
| parent | d9397f51f0cbd83f0eca3e8fadc3059d13675c27 (diff) | |
drm/i915: i8xx also doesn't like multiple oustanding pageflips
commit 6146b3d61925116e3fecce36c2fd873665bd6614 upstream.
My i855GM suffers from a 80k/s interrupt storm without this.
So add 2nd gen to the list of things that don't like more than
one outstanding pageflip request.
Furthermore I've changed the busy loop into a ringbuffer wait.
Busy-loops that don't check whether the chip died are simply evil.
And performance should actually improve, because there's usually
a decent amount of rendering queued on the gpu, hopefully rendering
that MI_WAIT into a noop by the time it's executed.
The current code holds dev->struct_mutex while executing this loop,
hence stalling all other gem activity anyway.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[anholt: resolved against conflict]
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 6f73716e6287..c234c6a86cfa 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -4290,14 +4290,16 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc, work->pending_flip_obj = obj; if (intel_crtc->plane) - flip_mask = I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT; + flip_mask = MI_WAIT_FOR_PLANE_B_FLIP; else - flip_mask = I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT; + flip_mask = MI_WAIT_FOR_PLANE_A_FLIP; - /* Wait for any previous flip to finish */ - if (IS_GEN3(dev)) - while (I915_READ(ISR) & flip_mask) - ; + if (IS_GEN3(dev) || IS_GEN2(dev)) { + BEGIN_LP_RING(2); + OUT_RING(MI_WAIT_FOR_EVENT | flip_mask); + OUT_RING(0); + ADVANCE_LP_RING(); + } /* Offset into the new buffer for cases of shared fbs between CRTCs */ offset = obj_priv->gtt_offset; |