[Intel-gfx] [PATCH 7/7] drm/i915: Add Wa_1409178092:icl,ehl

[Matt Roper]

Note that we used to have this implemented on ICL under a different
number (Wa_1604302699), but it was removed because it vanished from the
bspec and the register update didn't seem to be sticking.  However the
initial implementation of the workaround appears to have been in the
wrong place (not handled as an engine workaround) and might behave
better now that we've had various other updates to our multicast
register handling.

References: f545425a0145 ("drm/i915/icl: Remove Wa_1604302699")
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index a539157dd571..5e009ee070dc 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1495,6 +1495,10 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 		wa_write_or(wal,
 			    GEN7_FF_THREAD_MODE,
 			    GEN12_FF_TESSELATION_DOP_GATE_DISABLE);
+
+		/* Wa_1409178092:icl,ehl */
+		wa_write_or(wal, GEN10_L3_CHICKEN_MODE_REGISTER,
+			    GEN11_I2M_WRITE_DISABLE);
 	}
 
 	if (IS_GEN_RANGE(i915, 9, 12)) {
-- 
2.24.1