drm/i915: add TDL unit clock gating disable for VLV

Another required workaround for a potential hang:
WaDisableTDLUnitClockGating.

v2: only apply this to VLV, IVB doesn't need it anymore (Eugeni)

References: https://bugs.freedesktop.org/show_bug.cgi?id=50245
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 83c0e226f50c..47c1a3e9b4af 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3512,6 +3512,7 @@ static void valleyview_init_clock_gating(struct drm_device *dev)
          */
         I915_WRITE(GEN6_UCGCTL2,
                    GEN7_VDSUNIT_CLOCK_GATE_DISABLE |
+                   GEN7_TDLUNIT_CLOCK_GATE_DISABLE |
                    GEN6_RCZUNIT_CLOCK_GATE_DISABLE |
                    GEN6_RCPBUNIT_CLOCK_GATE_DISABLE |
                    GEN6_RCCUNIT_CLOCK_GATE_DISABLE);