Patch "drm/i915: disable PSR by default on HSW/BDW" 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: disable PSR by default on HSW/BDW

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-disable-psr-by-default-on-hsw-bdw.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: Tue, 13 Dec 2016 18:57:44 -0200
Subject: drm/i915: disable PSR by default on HSW/BDW

From: Paulo Zanoni <[email protected]>

commit 1c4672ce4eeaeaadeea8adabaad21262b7172607 upstream.

We've been ignoring the poor bugzilla reporters that say PSR causes system lockups and all other sorts of problems. The earliest bug report is from April, so I think we can use the "revert the offending commit if no fixes are presented within 8 months" rule here.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97602
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97515
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96736
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96704
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96569
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95176
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94985

---
 drivers/gpu/drm/i915/intel_psr.c |   10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

After we merged this, we closed even more fd.o bugs...

@@ -825,13 +825,9 @@ void intel_psr_init(struct drm_device *d
 	dev_priv->psr_mmio_base = IS_HASWELL(dev_priv) ?
 		HSW_EDP_PSR_BASE : BDW_EDP_PSR_BASE;
 
-	/* Per platform default */
-	if (i915.enable_psr == -1) {
-		if (IS_HASWELL(dev) || IS_BROADWELL(dev))
-			i915.enable_psr = 1;
-		else
-			i915.enable_psr = 0;
-	}
+	/* Per platform default: all disabled. */
+	if (i915.enable_psr == -1)
+		i915.enable_psr = 0;
 
 	/* Set link_standby x link_off defaults */
 	if (IS_HASWELL(dev) || IS_BROADWELL(dev))

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

queue-4.9/drm-i915-gen9-fix-the-wm-memory-bandwidth-wa-for-y-tiling-cases.patch queue-4.9/drm-i915-gen9-unconditionally-apply-the-memory-bandwidth-wa.patch queue-4.9/drm-i915-disable-psr-by-default-on-hsw-bdw.patch