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-rw-r--r--drivers/gpu/drm/i915/i915_reg.h4
-rw-r--r--drivers/gpu/drm/i915/intel_display.c4
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index eb44432d79bf..edced95aa75f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3020,6 +3020,10 @@
#define ILK_DPFC_DIS1 (1<<8)
#define ILK_DPFC_DIS2 (1<<9)
+#define IVB_CHICKEN3 0x4200c
+# define CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE (1 << 5)
+# define CHICKEN3_DGMG_DONE_FIX_DISABLE (1 << 2)
+
#define DISP_ARB_CTL 0x45000
#define DISP_TILE_SURFACE_SWIZZLING (1<<13)
#define DISP_FBC_WM_DIS (1<<15)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 30397b74a4a3..2e00c8ae361c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8450,6 +8450,10 @@ static void ivybridge_init_clock_gating(struct drm_device *dev)
I915_WRITE(ILK_DSPCLK_GATE, IVB_VRHUNIT_CLK_GATE);
+ I915_WRITE(IVB_CHICKEN3,
+ CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
+ CHICKEN3_DGMG_DONE_FIX_DISABLE);
+
for_each_pipe(pipe) {
I915_WRITE(DSPCNTR(pipe),
I915_READ(DSPCNTR(pipe)) |