[PATCH] drm/i915/bdw: Disable idle DOP clock gating

Ben Widawsky
2014-04-03T02:46:47Z

It seems we need this at least for the current platforms we have, but
probably not later. In any event, it should cause too much harm as we do
the same thing on several other platforms.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
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 fa00185..f73f8ca 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4868,6 +4868,10 @@ static void gen8_init_clock_gating(struct drm_device *dev)
I915_WRITE(GEN7_HALF_SLICE_CHICKEN1,
_MASKED_BIT_ENABLE(GEN7_SINGLE_SUBSCAN_DISPATCH_ENABLE));

+ /* WaDisableDopClockGating:bdw May not be needed for production */
+ I915_WRITE(GEN7_ROW_CHICKEN2,
+ _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
+
/* WaSwitchSolVfFArbitrationPriority:bdw */
I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);

--
1.9.1