diff mbox

drm/i915: align vlv forcewake with common lore

Message ID 1345819694-22891-1-git-send-email-daniel.vetter@ffwll.ch (mailing list archive)
State Superseded
Headers show

Commit Message

Daniel Vetter Aug. 24, 2012, 2:48 p.m. UTC 
For some odd reasons, the vlv forcewake code is rather different from
all other platforms, with no clear justifaction. Adjust things:

- don't check whether the gt is awak already (and bail out early), we
  need to grab a forcewake anyway. Otherwise the chip might go to
  sleep too early, and this would also screw up our forcewake
  accounting.
- Like all other platforms, check whether the gt has cleared the
  forcewake bit in the _ACK register before setting it again.
- Use _MASKED_BIT_ENABLE/DISABLE macros
- Only use bit0 of the fw reg, not all 16 bits.
- check the gtfifodb reg like on all other platforms in _put.
- Drop the POSTING_READs for consitency.

v2: Failure to git add ... again.

Tested-by: "Purushothaman, Vijay A" <vijay.a.purushothaman@intel.com>
Cc: "Widawsky, Benjamin" <benjamin.widawsky@intel.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/intel_pm.c |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 94aabca..839581a 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4064,12 +4064,10 @@  int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
 
 static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
 {
-	/* Already awake? */
-	if ((I915_READ(0x130094) & 0xa1) == 0xa1)
-		return;
+	if (wait_for_atomic_us((I915_READ_NOTRACE(FORCEWAKE_ACK_VLV) & 1) == 0, 500))
+		DRM_ERROR("Force wake wait timed out\n");
 
-	I915_WRITE_NOTRACE(FORCEWAKE_VLV, 0xffffffff);
-	POSTING_READ(FORCEWAKE_VLV);
+	I915_WRITE_NOTRACE(FORCEWAKE_VLV, _MASKED_BIT_ENABLE(1));
 
 	if (wait_for_atomic_us((I915_READ_NOTRACE(FORCEWAKE_ACK_VLV) & 1), 500))
 		DRM_ERROR("Force wake wait timed out\n");
@@ -4079,9 +4077,9 @@  static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
 
 static void vlv_force_wake_put(struct drm_i915_private *dev_priv)
 {
-	I915_WRITE_NOTRACE(FORCEWAKE_VLV, 0xffff0000);
-	/* FIXME: confirm VLV behavior with Punit folks */
-	POSTING_READ(FORCEWAKE_VLV);
+	I915_WRITE_NOTRACE(FORCEWAKE_VLV, _MASKED_BIT_DISABLE(1));
+	/* The below doubles as a POSTING_READ */
+	gen6_gt_check_fifodbg(dev_priv);
 }
 
 void intel_gt_init(struct drm_device *dev)