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>

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 40a407f41f61..6abb15f13c2b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2626,6 +2626,8 @@
 #define DISPLAY_PORT_PLL_BIOS_2         0x46014
 
 #define PCH_DSPCLK_GATE_D       0x42020
+# define DPFCUNIT_CLOCK_GATE_DISABLE            (1 << 9)
+# define DPFCRUNIT_CLOCK_GATE_DISABLE           (1 << 8)
 # define DPFDUNIT_CLOCK_GATE_DISABLE            (1 << 7)
 # define DPARBUNIT_CLOCK_GATE_DISABLE           (1 << 5)
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 98967f3b7724..d2ef1c2c65e9 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;