[Intel-gfx] [PATCH] drm/i915: Set the required VFMUNIT clock gating disable on Ironlake.

[Eric Anholt]

It's required by the specs, but we don't know why.  Let's not find out
why.

Signed-off-by: Eric Anholt <eric at anholt.net>
---
 drivers/gpu/drm/i915/i915_reg.h      |    3 +++
 drivers/gpu/drm/i915/intel_display.c |    2 ++
 2 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9e077fe..e8b00a3 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2512,6 +2512,9 @@
 # define MARIUNIT_CLOCK_GATE_DISABLE		(1 << 18)
 # define SVSMUNIT_CLOCK_GATE_DISABLE		(1 << 1)
 
+#define PCH_3DCGDIS1		0x46024
+# define VFMUNIT_CLOCK_GATE_DISABLE		(1 << 11)
+
 #define FDI_PLL_FREQ_CTL        0x46030
 #define  FDI_PLL_FREQ_CHANGE_REQUEST    (1<<24)
 #define  FDI_PLL_FREQ_LOCK_LIMIT_MASK   0xfff00
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3cdc9f0..3923738 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5768,6 +5768,8 @@ void intel_init_clock_gating(struct drm_device *dev)
 			I915_WRITE(PCH_3DCGDIS0,
 				   MARIUNIT_CLOCK_GATE_DISABLE |
 				   SVSMUNIT_CLOCK_GATE_DISABLE);
+			I915_WRITE(PCH_3DCGDIS1,
+				   VFMUNIT_CLOCK_GATE_DISABLE);
 		}
 
 		I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
-- 
1.7.2.3