drm/i915: Add wait_for in init_ring_common
authorSean Paul <seanpaul@chromium.org>
Fri, 16 Mar 2012 16:43:22 +0000 (12:43 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 17 Jan 2013 16:51:07 +0000 (08:51 -0800)
commit392dcfdce12ee18d511c74132704c8749b149141
tree9ff098d3873e87c7994042d05ad8fd7a816a89b0
parentfeef244d1742de63b5a7292883276ee6e11a06c5
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: Julien Cristau <jcristau@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/gpu/drm/i915/intel_ringbuffer.c