The same designer from the previous patch has told us to never read
FORCEWAKE. We only do this for the POSTING_READ(), so simply change that
to something within the same cacheline (for no reason in particular
other than it sounds nice). In the _mt case we can leverage
the gtfifodbg check for the POSTING_READ.
This partially reverts
commit 6af2d180f82151cf3d58952e35a4f96e45bc453a
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date: Thu Jul 26 16:24:50 2012 +0200
drm/i915: fix forcewake related hangs on snb
v2: commit message, comments about posting read from (Daniel)
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
drivers/gpu/drm/i915/intel_pm.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 2a8468d..0d71ba7 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3975,7 +3975,7 @@ static void __gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
DRM_ERROR("Force wake wait timed out\n");
I915_WRITE_NOTRACE(FORCEWAKE, 1);
- POSTING_READ(FORCEWAKE);
+ POSTING_READ(ECOBUS); /* something from same cacheline, but !FORCEWAKE */
if (wait_for_atomic((I915_READ_NOTRACE(forcewake_ack) & 1),
FORCEWAKE_ACK_TIMEOUT_MS))
@@ -3998,7 +3998,7 @@ static void __gen6_gt_force_wake_mt_get(struct drm_i915_private *dev_priv)
DRM_ERROR("Force wake wait timed out\n");
I915_WRITE_NOTRACE(FORCEWAKE_MT, _MASKED_BIT_ENABLE(1));
- POSTING_READ(FORCEWAKE_MT);
+ POSTING_READ(ECOBUS); /* something from same cacheline, but !FORCEWAKE */
if (wait_for_atomic((I915_READ_NOTRACE(forcewake_ack) & 1),
FORCEWAKE_ACK_TIMEOUT_MS))
@@ -4035,14 +4035,14 @@ void gen6_gt_check_fifodbg(struct drm_i915_private *dev_priv)
static void __gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
{
I915_WRITE_NOTRACE(FORCEWAKE, 0);
- POSTING_READ(FORCEWAKE);
+ /* gen6_gt_check_fifodbg doubles as the POSTING_READ */
gen6_gt_check_fifodbg(dev_priv);
}
static void __gen6_gt_force_wake_mt_put(struct drm_i915_private *dev_priv)
{
I915_WRITE_NOTRACE(FORCEWAKE_MT, _MASKED_BIT_DISABLE(1));
- POSTING_READ(FORCEWAKE_MT);
+ /* gen6_gt_check_fifodbg doubles as the POSTING_READ */
gen6_gt_check_fifodbg(dev_priv);
}
--
1.7.12
