drm/i915: set more FBC chicken bits

Add a couple of missing workaround bits for ILK & SNB.  These disable
clock gating on a couple of units that would otherwise prevent FBC from
working.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.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/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 98967f3b772..d2ef1c2c65e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6286,7 +6286,9 @@ void intel_enable_clock_gating(struct drm_device *dev)
 
                 if (IS_GEN5(dev)) {
                         /* Required for FBC */
-                        dspclk_gate |= DPFDUNIT_CLOCK_GATE_DISABLE;
+                        dspclk_gate |= DPFCUNIT_CLOCK_GATE_DISABLE |
+                                DPFCRUNIT_CLOCK_GATE_DISABLE |
+                                DPFDUNIT_CLOCK_GATE_DISABLE;
                         /* Required for CxSR */
                         dspclk_gate |= DPARBUNIT_CLOCK_GATE_DISABLE;