The hardware should not dynamically balance the load between CCS
engines. Wa_14019159160 recommends disabling it across all
platforms.
Fixes: d2eae8e98d59 ("drm/i915/dg2: Drop force_probe requirement")
Signed-off-by: Andi Shyti <andi.sh...@linux.intel.com>
Cc: Chris Wilson <chris.p.wil...@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
Cc: Matt Roper <matthew.d.ro...@intel.com>
Cc: <sta...@vger.kernel.org> # v6.2+
---
drivers/gpu/drm/i915/gt/intel_gt_regs.h | 1 +
drivers/gpu/drm/i915/gt/intel_workarounds.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 50962cfd1353..cf709f6c05ae 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1478,6 +1478,7 @@
#define GEN12_RCU_MODE _MMIO(0x14800)
#define GEN12_RCU_MODE_CCS_ENABLE REG_BIT(0)
+#define XEHP_RCU_MODE_FIXED_SLICE_CCS_MODE REG_BIT(1)
#define CHV_FUSE_GT _MMIO(VLV_GUNIT_BASE + 0x2168)
#define CHV_FGT_DISABLE_SS0 (1 << 10)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c
b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index d67d44611c28..57c1f3d2589e 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -2945,6 +2945,12 @@ general_render_compute_wa_init(struct intel_engine_cs
*engine, struct i915_wa_li
/* Wa_18028616096 */
wa_mcr_write_or(wal, LSC_CHICKEN_BIT_0_UDW,
UGM_FRAGMENT_THRESHOLD_TO_3);
+
+ /*
+ * Wa_14019159160: disable the CCS load balancing
+ * indiscriminately for all the platforms
+ */
+ wa_masked_en(wal, GEN12_RCU_MODE,
XEHP_RCU_MODE_FIXED_SLICE_CCS_MODE);
}
if (IS_DG2_G11(i915)) {
--
2.43.0
