Patch "drm/i915/kbl: KBL also needs to run the SAGV code" has been added to the 4.8-stable tree

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

drm/i915/kbl: KBL also needs to run the SAGV code

to the 4.8-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-kbl-kbl-also-needs-to-run-the-sagv-code.patch

and it can be found in the queue-4.8 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: Thu, 22 Sep 2016 18:00:29 -0300
Subject: drm/i915/kbl: KBL also needs to run the SAGV code

From: Paulo Zanoni <[email protected]>

commit 17777d61f4a87d7b6d5585e8fdffa83773c594e7 upstream.

According to BSpec, it's the "core CPUs" that need the code, which means SKL and KBL, but not BXT.

I don't have a KBL to test this patch on it.

v2: Only SKL should have I915_SAGV_NOT_CONTROLLED.

---
 drivers/gpu/drm/i915/intel_pm.c |   14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

@@ -2881,8 +2881,14 @@ skl_wm_plane_id(const struct intel_plane
 static bool
 intel_has_sagv(struct drm_i915_private *dev_priv)
 {
-	return IS_SKYLAKE(dev_priv) &&
-	       dev_priv->sagv_status != I915_SAGV_NOT_CONTROLLED;
+	if (IS_KABYLAKE(dev_priv))
+		return true;
+
+	if (IS_SKYLAKE(dev_priv) &&
+	    dev_priv->sagv_status != I915_SAGV_NOT_CONTROLLED)
+		return true;
+
+	return false;
 }
 
 /*

@@ -2920,7 +2926,7 @@ intel_enable_sagv(struct drm_i915_privat
 	 * Some skl systems, pre-release machines in particular,
 	 * don't actually have an SAGV.
 	 */
-	if (ret == -ENXIO) {
+	if (IS_SKYLAKE(dev_priv) && ret == -ENXIO) {
 		DRM_DEBUG_DRIVER("No SAGV found on system, ignoring\n");
 		dev_priv->sagv_status = I915_SAGV_NOT_CONTROLLED;
 		return 0;

@@ -2974,7 +2980,7 @@ intel_disable_sagv(struct drm_i915_priva
 	 * Some skl systems, pre-release machines in particular,
 	 * don't actually have an SAGV.
 	 */
-	if (result == -ENXIO) {
+	if (IS_SKYLAKE(dev_priv) && result == -ENXIO) {
 		DRM_DEBUG_DRIVER("No SAGV found on system, ignoring\n");
 		dev_priv->sagv_status = I915_SAGV_NOT_CONTROLLED;
 		return 0;

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

queue-4.8/drm-i915-gen9-fix-the-watermark-res_blocks-value.patch queue-4.8/drm-i915-gen9-only-add-the-planes-actually-affected-by-ddb-changes.patch queue-4.8/drm-i915-gen9-fix-the-wawmmemoryreadlatency-implementation.patch queue-4.8/drm-i915-introduce-intel_has_sagv.patch queue-4.8/drm-i915-gen9-fix-plane_blocks_per_line-on-watermarks-calculations.patch queue-4.8/drm-i915-kbl-kbl-also-needs-to-run-the-sagv-code.patch queue-4.8/drm-i915-gen9-minimum-scanlines-for-y-tile-is-not-always-4.patch queue-4.8/drm-i915-sagv-is-not-skl-only-so-rename-a-few-things.patch