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| author | Sean Paul <seanpaul@chromium.org> | 2012-03-16 12:43:22 -0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-08-19 18:15:34 +0100 |
| commit | 9e7bbc7d2d8641d1375c29aecd6636f3d670b584 (patch) | |
| tree | b0e5898bb1b2c6d0eb674e1b99ec772c8db19ed6 | |
| parent | 85f303b44b2d778f6841a2c1c77f2f9dfdee2be5 (diff) | |
| download | lwn-9e7bbc7d2d8641d1375c29aecd6636f3d670b584.tar.gz lwn-9e7bbc7d2d8641d1375c29aecd6636f3d670b584.zip | |
drm/i915: Add wait_for in init_ring_common
commit f01db988ef6f6c70a6cc36ee71e4a98a68901229 upstream.
I have seen a number of "blt ring initialization failed" messages
where the ctl or start registers are not the correct value. Upon further
inspection, if the code just waited a little bit, it would read the
correct value. Adding the wait_for to these reads should eliminate the
issue.
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index d2cbe5d6f914..4983e590b46d 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -295,9 +295,9 @@ static int init_ring_common(struct intel_ring_buffer *ring) | RING_VALID); /* If the head is still not zero, the ring is dead */ - if ((I915_READ_CTL(ring) & RING_VALID) == 0 || - I915_READ_START(ring) != obj->gtt_offset || - (I915_READ_HEAD(ring) & HEAD_ADDR) != 0) { + if (wait_for((I915_READ_CTL(ring) & RING_VALID) != 0 && + I915_READ_START(ring) == obj->gtt_offset && + (I915_READ_HEAD(ring) & HEAD_ADDR) == 0, 50)) { DRM_ERROR("%s initialization failed " "ctl %08x head %08x tail %08x start %08x\n", ring->name, |