[PATCH] drm/i915: Drop WA 16015675438

[Lucas De Marchi <lucas.demarchi@intel.com>]

With dynamic load-balancing disabled on the compute side, there's no
reason left to enable WA 16015675438. Drop it from both PVC and DG2.
Note that this can be done because now the driver always set a fixed
partition of EUs during initialization via the ccs_mode configuration.

The flag to GuC is still needed because of 18020744125, so update
the comment accordingly.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Mateusz Jablonski <mateusz.jablonski@intel.com>
Acked-by: Michal Mrozek <michal.mrozek@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---

This is the i915 counter part. The xe version of this patch
(https://lore.kernel.org/intel-xe/20240304233103.1687412-1-lucas.demarchi@intel.com/)
was already merged in drm-xe-next. I'm keeping the acked-by as it also
applies the same logic in i915.

 drivers/gpu/drm/i915/gt/intel_workarounds.c | 6 +-----
 drivers/gpu/drm/i915/gt/uc/intel_guc.c      | 2 +-
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index d67d44611c28..7f812409c30a 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -2928,14 +2928,10 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
 		wa_mcr_write_or(wal, LSC_CHICKEN_BIT_0, DISABLE_D8_D16_COASLESCE);
 	}
 
-	if (IS_PONTEVECCHIO(i915) || IS_DG2(i915)) {
+	if (IS_PONTEVECCHIO(i915) || IS_DG2(i915))
 		/* Wa_14015227452:dg2,pvc */
 		wa_mcr_masked_en(wal, GEN9_ROW_CHICKEN4, XEHP_DIS_BBL_SYSPIPE);
 
-		/* Wa_16015675438:dg2,pvc */
-		wa_masked_en(wal, FF_SLICE_CS_CHICKEN2, GEN12_PERF_FIX_BALANCING_CFE_DISABLE);
-	}
-
 	if (IS_DG2(i915)) {
 		/*
 		 * Wa_16011620976:dg2_g11
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index d2b7425bbdcc..c6603793af89 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -315,7 +315,7 @@ static u32 guc_ctl_wa_flags(struct intel_guc *guc)
 	if (IS_DG2_G11(gt->i915))
 		flags |= GUC_WA_CONTEXT_ISOLATION;
 
-	/* Wa_16015675438 */
+	/* Wa_18020744125 */
 	if (!RCS_MASK(gt))
 		flags |= GUC_WA_RCS_REGS_IN_CCS_REGS_LIST;
 
-- 
2.43.0