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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [gm45 regression] [drm:init_ring_common]: *ERROR* render ring initialization failed"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76554#c45">Comment # 45</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [gm45 regression] [drm:init_ring_common]: *ERROR* render ring initialization failed"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76554">bug 76554</a>
from <span class="vcard"><a class="email" href="mailto:jikos@jikos.cz" title="Jiri Kosina <jikos@jikos.cz>"> <span class="fn">Jiri Kosina</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=76554#c44">comment #44</a>)
<span class="quote">> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
> b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 5a74986348c6..b46b3e928a7f 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -530,6 +530,17 @@ static int init_ring_common(struct intel_ring_buffer
> *ring)
> ((ring->size - PAGE_SIZE) & RING_NR_PAGES)
> | RING_VALID);
>
> + if (I915_READ_START(ring) != i915_gem_obj_ggtt_offset(obj)) {
> + printk(KERN_ERR
> + "%s initialization failed"
> + " [%08x != %08x], fudging\n",
> + ring->name,
> + I915_READ_START(ring),
> + i915_gem_obj_ggtt_offset(obj));
> + I915_WRITE_START(ring, i915_gem_obj_ggtt_offset(obj));
> + POSTING_READ(ring);
> + }
> +
> iowrite32(MI_NOOP, ring->virtual_start + 0);
> iowrite32(MI_NOOP, ring->virtual_start + 4);
> ring->write_tail(ring, 8);</span >
What is a baseline I should apply this on top of, please? The surrounding code
in my tree (with all the patches provided so far apples) is
[ ... ]
I915_WRITE_CTL(ring,
((ring->size - PAGE_SIZE) & RING_NR_PAGES)
| RING_VALID);
if (wait_for(I915_READ_CTL(ring) & RING_VALID, 1000)) {
DRM_ERROR("%s initialization failed ctl %08x (valid? %d)\n",
ring->name,
I915_READ_CTL(ring),
!!(I915_READ_CTL(ring) & RING_VALID));
ret = -EIO;
goto out;
}
I915_WRITE_HEAD(ring, 0);
ring->write_tail(ring, 0);
iowrite32(MI_NOOP, ring->virtual_start + 0);
iowrite32(MI_NOOP, ring->virtual_start + 4);
ring->write_tail(ring, 8);
[ ... ]
(i.e. it has the extra I915_WRITE_HEAD(ring, 0); ring->write_tail(ring, 0);,
etc).
I can of course easily apply the hunk just between the
ring->write_tail(ring, 0);
and
iowrite32(MI_NOOP, ring->virtual_start + 0);
if that's what you want me to do.
Thanks.</pre>
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