drm/i915: save/restore BLC histogram control reg across suspend/resume
Turns out some machines, like the ThinkPad X40 don't come back if you
don't save/restore this register.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 24e154e..f6a3587 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -304,6 +304,7 @@
u32 saveDSPASURF;
u32 saveDSPATILEOFF;
u32 savePFIT_PGM_RATIOS;
+ u32 saveBLC_HIST_CTL;
u32 saveBLC_PWM_CTL;
u32 saveBLC_PWM_CTL2;
u32 saveFPB0;