Patch "drm/i915: skip the first 4k of stolen memory on everything >= gen8" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

drm/i915: skip the first 4k of stolen memory on everything >= gen8

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
drm-i915-skip-the-first-4k-of-stolen-memory-on-everything-gen8.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Paulo Zanoni <[email protected]>
Date: Wed, 14 Dec 2016 12:55:37 -0200
Subject: drm/i915: skip the first 4k of stolen memory on everything >= gen8

From: Paulo Zanoni <[email protected]>

commit 6ba0566cf2afcdb17bff882e3a95cbbcb22c4a83 upstream.

BSpec got updated and this workaround is now listed as standard required programming for all subsequent projects. This is confirmed to fix Skylake screen flickering issues (probably caused by the fact that we initialized a ring in the first page of stolen, but I didn't 100% confirm this theory).

v2: this is the patch that fixes the screen flickering, document it.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94605

---
 drivers/gpu/drm/i915/i915_gem_stolen.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

@@ -55,10 +55,9 @@ int i915_gem_stolen_insert_node_in_range
 		return -ENODEV;
 
 	/* See the comment at the drm_mm_init() call for more about this check.
-	 * WaSkipStolenMemoryFirstPage:bdw,chv,kbl (incomplete)
+	 * WaSkipStolenMemoryFirstPage:bdw+ (incomplete)
 	 */
-	if (start < 4096 && (IS_GEN8(dev_priv) ||
-			     IS_KBL_REVID(dev_priv, 0, KBL_REVID_A0)))
+	if (start < 4096 && INTEL_GEN(dev_priv) >= 8)
 		start = 4096;
 
 	mutex_lock(&dev_priv->mm.stolen_lock);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/drm-i915-skip-the-first-4k-of-stolen-memory-on-everything-gen8.patch