Patch "drm/i915: Ignore bogus plane coordinates on SKL when the plane is not visible" 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: Ignore bogus plane coordinates on SKL when the plane is not visible

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-ignore-bogus-plane-coordinates-on-skl-when-the-plane-is-not-visible.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: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <[email protected]>
Date: Mon, 7 Nov 2016 22:20:54 +0200
Subject: drm/i915: Ignore bogus plane coordinates on SKL when the plane is not visible
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From: Ville Syrjälä <[email protected]>

commit 3bfdfdcbce2796ce75bf2d85fd8471858d702e5d upstream.

When the plane is invisible we may have all sorts of bogus stuff in the coordinates, which we must ignore or else we might fail the plane update. This started to happen on SKL when I moved the plane offset computation to happen in the check phase. Previously we happily ignored it all since we never called the update_plane hook with an invisible plane.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98258
Testcase: igt/pm_rpm/legacy-planes
Testcase: igt/pm_rpm/universal-planes

---
 drivers/gpu/drm/i915/intel_display.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -2975,6 +2975,9 @@ int skl_check_plane_surface(struct intel
 	unsigned int rotation = plane_state->base.rotation;
 	int ret;
 
+	if (!plane_state->base.visible)
+		return 0;
+
 	/* Rotate src coordinates to match rotated GTT view */
 	if (intel_rotation_90_or_270(rotation))
 		drm_rect_rotate(&plane_state->base.src,

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

queue-4.9/drm-i915-ignore-bogus-plane-coordinates-on-skl-when-the-plane-is-not-visible.patch queue-4.9/drm-fix-broken-vt-switch-with-video-1366x768-option.patch