[Intel-gfx] [PATCH 4/4] drm/i915/dg1: WA GPU hang at RCC

[Lucas De Marchi]

From: Zhen Han <zhen.han at intel.com>

GPU hangs at RCC. According to Wa_14012131227 we shouldn't have a hang
due to RHWO, but that is what we are observing, even without media
compressible render target. Feedback from HW engineers is to leave RHWO
disabled.

Cc: Jianjun Liu <Jianjun.liu at intel.com>
Cc: Chuansheng Liu <chuansheng.liu at intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
Signed-off-by: Zhen Han <zhen.han at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index e678fa8d2ab9..5235fb70a69a 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -739,6 +739,17 @@ static void dg1_ctx_workarounds_init(struct intel_engine_cs *engine,
 	       FF_MODE2,
 	       FF_MODE2_GS_TIMER_MASK,
 	       FF_MODE2_GS_TIMER_224, 0);
+
+	/*
+	 * Wa_14012131227
+	 *
+	 * Although the WA is described as causing corruption when using media
+	 * compressible render target, leaving RHWO enabled is also causing
+	 * gpu hang when using multiple concurrent render and media workloads.
+	 * Disable it completely for now.
+	 */
+	wa_masked_en(wal, GEN7_COMMON_SLICE_CHICKEN1,
+		     GEN9_RHWO_OPTIMIZATION_DISABLE);
 }
 
 static void
-- 
2.30.1