The commit below causes my Sandybridge system to fail at initial KMS
initialization:
Aug 27 18:58:04 livid kernel: [ 9.099032] i915 0000:00:02.0: irq 42 for MSI/M
SI-X
Aug 27 18:58:04 livid kernel: [ 9.099086] [drm:init_ring_common] *ERROR*
render ring initialization failed ctl 00000000 head 00000000 tail 00000000
start 00000000
Aug 27 18:58:04 livid kernel: [ 9.099266] [drm:i915_driver_load] *ERROR*
failed to init modeset
Aug 27 18:58:04 livid kernel: [ 9.110257] PM: Removing info for No Bus:card0
Aug 27 18:58:04 livid kernel: [ 9.110304] PM: Removing info for No
Bus:controlD64
Aug 27 18:58:04 livid kernel: [ 9.110326] i915: probe of 0000:00:02.0 failed
with error -5
[Ignore the date/time---that really was from a boot today.]
Chris, what can I do to help debug what the correct solution is here?
-Carl
commit 176f28ebf4303b4f7e3a5bd8be7842a8bbecd9c3
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date: Thu Oct 28 11:18:07 2010 +0100
drm/i915/ringbuffer: Check that we setup the ringbuffer
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/inte
index 8eaa60c..e88214e 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -176,9 +176,10 @@ static int init_ring_common(struct intel_ring_buffer *ring)
((ring->gem_object->size - PAGE_SIZE) & RING_NR_PAGES)
| RING_NO_REPORT | RING_VALID);
- head = I915_READ_HEAD(ring) & HEAD_ADDR;
/* If the head is still not zero, the ring is dead */
- if (head != 0) {
+ if ((I915_READ_CTL(ring) & RING_VALID) == 0 ||
+ I915_READ_START(ring) != obj_priv->gtt_offset ||
+ (I915_READ_HEAD(ring) & HEAD_ADDR) != 0) {
DRM_ERROR("%s initialization failed "
"ctl %08x head %08x tail %08x start %08x\n",
ring->name,
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
