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authorAlban Browaeys <prahal@yahoo.com>2012-02-24 17:12:45 +0000
committerJesse Barnes <jbarnes@virtuousgeek.org>2012-02-24 09:36:25 -0800
commitaed3f09db39596e539f90b11a5016aea4d8442e1 (patch)
tree62e3645dd8cc2be9f1fb4ca6a168f40d3c3c5898 /drivers/gpu
parentc0e2ee1bc0cf82eec89e26b7afe7e4db0561b7d9 (diff)
downloadop-kernel-dev-aed3f09db39596e539f90b11a5016aea4d8442e1.zip
op-kernel-dev-aed3f09db39596e539f90b11a5016aea4d8442e1.tar.gz
drm/i915: Prevent a machine hang by checking crtc->active before loading lut
Before loading the lut (gamma), check the active state of intel_crtc, otherwise at least on gen2 hang ensue. This is reproducible in Xorg via: xset dpms force off then xgamma -rgamma 2.0 # freeze. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=44505 Signed-off-by: Alban Browaeys <prahal@yahoo.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: stable@kernel.org Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/i915/intel_display.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 4871ba0..f851db7 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6184,7 +6184,7 @@ void intel_crtc_load_lut(struct drm_crtc *crtc)
int i;
/* The clocks have to be on to load the palette. */
- if (!crtc->enabled)
+ if (!crtc->enabled || !intel_crtc->active)
return;
/* use legacy palette for Ironlake */
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