From e0ee9beceb24baaadb2675d0bb172afc07cbb073 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 10 Oct 2012 12:25:45 -0500
Subject: [PATCH] drm/i915: Remove too early plane enable on pre-PCH hardware
Enabling the plane before we have assigned valid address means that it
will access random PTE (often with conflicting memory types) and cause
GPU lockups. However, enabling the plane too early appears to workaround
a number of bugs in our modesetting code.
Cc: Franz Melchior <melchior.franz@gmail.com>
References: https://bugs.freedesktop.org/show_bug.cgi?id=39947
References: https://bugs.freedesktop.org/show_bug.cgi?id=41091
References: https://bugs.freedesktop.org/show_bug.cgi?id=49041
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
(cherry-picked from c7bd4c25650704d4d065eb4ce2a122d2a80ce804)
BugLink: http://bugs.launchpad.net/bugs/949130
Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
---
drivers/gpu/drm/i915/intel_display.c | 1 -
1 file changed, 1 deletion(-)
@@ -5192,7 +5192,6 @@ static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
I915_WRITE(DSPCNTR(plane), dspcntr);
POSTING_READ(DSPCNTR(plane));
- intel_enable_plane(dev_priv, plane, pipe);
ret = intel_pipe_set_base(crtc, x, y, old_fb);
--
1.7.9.5