[Intel-gfx] [PATCH 2/7] drm/i915: Add thread stall DOP clock gating workaround on Broadwell.

[Rodrigo Vivi]

From: Kenneth Graunke <kenneth at whitecape.org>

Ben and I believe this will be necessary on production hardware.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 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 684dc5f..f919596 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5412,6 +5412,10 @@ static void gen8_init_clock_gating(struct drm_device *dev)
 	I915_WRITE(GEN8_ROW_CHICKEN,
 		   _MASKED_BIT_ENABLE(STALL_DOP_GATING_DISABLE));
 
+	/* WaDisableThreadStallDopClockGating:bdw */
+	I915_WRITE(GEN8_ROW_CHICKEN,
+		   _MASKED_BIT_ENABLE(STALL_DOP_GATING_DISABLE));
+
 	/*
 	 * This GEN8_CENTROID_PIXEL_OPT_DIS W/A is only needed for
 	 * pre-production hardware
-- 
1.9.3