From: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date: Wed, 5 Nov 2014 15:30:52 +0000 (+0200)
Subject: Revert "drm/i915/vlv: Remove check for Old Ack during forcewake"
X-Git-Tag: v3.19-rc1~73^2~64^2~6
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9500986159d9017f9277f9e42a1f9b13b5e0e666;p=karo-tx-linux.git

Revert "drm/i915/vlv: Remove check for Old Ack during forcewake"

This reverts commit 5cb13c07dae73380d8b3ddc792740487b8742938.

While the relevance for WaRsDontPollForAckOnClearingFWBits is under
investigation, revert this as regression.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=85684
Tested-by:   Tested-by: lu hua <huax.lu@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: S, Deepak <deepak.s@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 68e722b780a1..6a0c3fb2cbf0 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -194,15 +194,13 @@ static void vlv_force_wake_reset(struct drm_i915_private *dev_priv)
 static void __vlv_force_wake_get(struct drm_i915_private *dev_priv,
 						int fw_engine)
 {
-	/*
-	 * WaRsDontPollForAckOnClearingFWBits:vlv
-	 * Hardware clears ack bits lazily (only when all ack
-	 * bits become 0) so don't poll for individiual ack
-	 * bits to be clear here like on other platforms.
-	 */
-
 	/* Check for Render Engine */
 	if (FORCEWAKE_RENDER & fw_engine) {
+		if (wait_for_atomic((__raw_i915_read32(dev_priv,
+						FORCEWAKE_ACK_VLV) &
+						FORCEWAKE_KERNEL) == 0,
+					FORCEWAKE_ACK_TIMEOUT_MS))
+			DRM_ERROR("Timed out: Render forcewake old ack to clear.\n");
 
 		__raw_i915_write32(dev_priv, FORCEWAKE_VLV,
 				   _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
@@ -216,6 +214,11 @@ static void __vlv_force_wake_get(struct drm_i915_private *dev_priv,
 
 	/* Check for Media Engine */
 	if (FORCEWAKE_MEDIA & fw_engine) {
+		if (wait_for_atomic((__raw_i915_read32(dev_priv,
+						FORCEWAKE_ACK_MEDIA_VLV) &
+						FORCEWAKE_KERNEL) == 0,
+					FORCEWAKE_ACK_TIMEOUT_MS))
+			DRM_ERROR("Timed out: Media forcewake old ack to clear.\n");
 
 		__raw_i915_write32(dev_priv, FORCEWAKE_MEDIA_VLV,
 				   _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));