drm/i915: Remove the WaDisableBackToBackFlipFix w/a for Haswell

This workaround is only valid for IVB and VLV and the write triggers an
error on HSW.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanonI@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 0 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 0dd2ca707d0a..eb757e5f2d87 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3474,10 +3474,6 @@ static void haswell_init_clock_gating(struct drm_device *dev)
         I915_WRITE(_3D_CHICKEN3,
                    _MASKED_BIT_ENABLE(_3D_CHICKEN_SF_DISABLE_OBJEND_CULL));
 
-        I915_WRITE(IVB_CHICKEN3,
-                   CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
-                   CHICKEN3_DGMG_DONE_FIX_DISABLE);
-
         /* Apply the WaDisableRHWOOptimizationForRenderHang workaround. */
         I915_WRITE(GEN7_COMMON_SLICE_CHICKEN1,
                    GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC);