On 06/04/2012 06:18 AM, Daniel Vetter wrote:
Empirical evidence suggests that we need to: On at least one ivb
machine when running the hangman i-g-t test, the rings don't properly
initialize properly - the RING_START registers seems to be stuck at
all zeros.
Holding forcewake around this register init sequences makes chip reset
reliable again. Note that this is not the first such issue:
commit f01db988ef6f6c70a6cc36ee71e4a98a68901229
Author: Sean Paul<seanp...@chromium.org>
Date: Fri Mar 16 12:43:22 2012 -0400
drm/i915: Add wait_for in init_ring_common
added delay loops to make RING_START and RING_CTL initialization
reliable on the blt ring at boot-up. So I guess it won't hurt if we do
this unconditionally for all force_wake needing gpus.
To avoid copy&pasting of the HAS_FORCE_WAKE check I've added a new
intel_info bit for that.
v2: Fixup missing commas in static struct and properly handling the
error case in init_ring_common, both noticed by Jani Nikula.
Cc: stable@vger.kernel.org
Reported-by: Yang Guang<guang.a.y...@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50522
Signed-Off-by: Daniel Vetter<daniel.vet...@ffwll.ch>
The new .has_forcewake looks nice! Just one very tiny bikeshed below :).
Reviewed-by: Eugeni Dodonov <eugeni.dodo...@intel.com>
@@ -285,6 +285,7 @@ struct intel_device_info {
u8 is_ivybridge:1;
u8 is_valleyview:1;
u8 has_pch_split:1;
+ u8 has_force_wake:1;
u8 is_haswell:1;
u8 has_fbc:1;
u8 has_pipe_cxsr:1;
While you are on it, maybe it would make sense to move is_haswell up, so
all the 'is_*' and 'has_*' flags would stay together?
It is partly may fault though, due to the has_pch_split which ended up
in wrong place, but as you are touching those fields anyway, perhaps we
could rectify it for the future? :)
Eugeni
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