[Intel-gfx] [PATCH 7/8] drm/i915: Add WaDisableInstructionShootdown:bdw

[Michel Thierry]

Instruction Shootdown in ROW_CHICKEN must be disabled.

Signed-off-by: Michel Thierry <michel.thierry at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 1 +
 drivers/gpu/drm/i915/intel_pm.c | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ff1acbe..2f0c759 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5637,6 +5637,7 @@ enum punit_power_well {
 #define   GEN7_PSD_SINGLE_PORT_DISPATCH_ENABLE	(1<<3)
 
 #define GEN8_ROW_CHICKEN		0xe4f0
+#define   INSTRUCTION_SHOOTDOWN_DISABLE	(1<<9)
 #define   PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE	(1<<8)
 #define   STALL_DOP_GATING_DISABLE		(1<<5)
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 64e3245..c16dcb3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5405,8 +5405,10 @@ static void gen8_init_clock_gating(struct drm_device *dev)
 		   _MASKED_BIT_ENABLE(PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE));
 
 	/* WaDisableThreadStallDopClockGating:bdw */
-	/* FIXME: Unclear whether we really need this on production bdw. */
+	/* WaDisableInstructionShootdown:bdw */
+	/* FIXME: Unclear whether we really need these on production bdw. */
 	I915_WRITE(GEN8_ROW_CHICKEN,
+		   _MASKED_BIT_ENABLE(INSTRUCTION_SHOOTDOWN_DISABLE) |
 		   _MASKED_BIT_ENABLE(STALL_DOP_GATING_DISABLE));
 
 	/*
-- 
1.9.0