[Intel-gfx] [PATCH] drm/i915: CR clock gating is recommend to be set on PineView

[Chris Wilson]

The specs recommend that this bit be set on PineView. No reason is
given, but it sounds like a powersaving bit that we should expect the
BIOS to be setting...

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_pm.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1e85df6..b14021b 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2876,6 +2876,10 @@ static void gen3_init_clock_gating(struct drm_device *dev)
 	dstate |= DSTATE_PLL_D3_OFF | DSTATE_GFX_CLOCK_GATING |
 		DSTATE_DOT_CLOCK_GATING;
 	I915_WRITE(D_STATE, dstate);
+
+	if (IS_PINEVIEW(dev))
+		I915_WRITE(ECOSKPD,
+			   ECO_GATING_CX_ONLY << 16 | ECO_GATING_CX_ONLY);
 }
 
 static void i85x_init_clock_gating(struct drm_device *dev)
-- 
1.7.10