[Intel-gfx] [RFC 2/2] drm/i915/tgl: WaDisableGPGPUMidThreadPreemption

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Make thread-group preemption default because...?

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: piotr.zdunowski at intel.com
Cc: michal.mrozek at intel.com
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 5d2a8cb70e16..809bb56eb167 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -593,6 +593,11 @@ static void tgl_ctx_workarounds_init(struct intel_engine_cs *engine,
 	wa_add(wal, FF_MODE2, FF_MODE2_TDS_TIMER_MASK, val,
 	       IS_TGL_REVID(engine->i915, TGL_REVID_A0, TGL_REVID_A0) ? 0 :
 			    FF_MODE2_TDS_TIMER_MASK);
+
+	/* WaDisableGPGPUMidThreadPreemption:tgl */
+	WA_SET_FIELD_MASKED(GEN8_CS_CHICKEN1,
+			    GEN9_PREEMPT_GPGPU_LEVEL_MASK,
+			    GEN9_PREEMPT_GPGPU_THREAD_GROUP_LEVEL);
 }
 
 static void
-- 
2.20.1