This is a note to let you know that I've just added the patch titled
drm/i915: Add wait_for in init_ring_common
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
0007-drm-i915-Add-wait_for-in-init_ring_common.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 9d4d3e3a82cceb7a2fadac9ca284b9fa6bee086d Mon Sep 17 00:00:00 2001
From: Sean Paul <[email protected]>
Date: Fri, 16 Mar 2012 12:43:22 -0400
Subject: drm/i915: Add wait_for in init_ring_common
From: Sean Paul <[email protected]>
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 <[email protected]>
Reviewed-by: Ben Widawsky <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Signed-off-by: Julien Cristau <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/i915/intel_ringbuffer.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- 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_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,
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/0007-drm-i915-Add-wait_for-in-init_ring_common.patch
queue-3.4/0005-drm-i915-hold-forcewake-around-ring-hw-init.patch
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