i915: reprogram power monitoring registers on resume

Fixes issue where i915_gfx_val was reporting values several
orders of magnitude higher than physically possible (without
leaving scorch marks on my thighs at least.)

Signed-off-by: Kyle McMartin <kyle@redhat.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: stable@kernel.org
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 989c19d2d959..454c064f8ef7 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -862,8 +862,10 @@ int i915_restore_state(struct drm_device *dev)
         /* Clock gating state */
         intel_init_clock_gating(dev);
 
-        if (HAS_PCH_SPLIT(dev))
+        if (HAS_PCH_SPLIT(dev)) {
                 ironlake_enable_drps(dev);
+                intel_init_emon(dev);
+        }
 
         /* Cache mode state */
         I915_WRITE (CACHE_MODE_0, dev_priv->saveCACHE_MODE_0 | 0xffff0000);