drm/i915: Implement WaDisableEarlyEOT.
There seems to be another clock gating issue which the workaround is
described as:
"WA: Set 0xE4F0[1] = 1 to disable Early EOT of thread."
Signed-off-by: Rafael Antognolli <rafael.antognolli@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171216001117.14232-2-rafael.antognolli@intel.com
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 759c600..268bbd0 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8146,6 +8146,7 @@ enum {
#define PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE (1<<8)
#define STALL_DOP_GATING_DISABLE (1<<5)
#define THROTTLE_12_5 (7<<2)
+#define DISABLE_EARLY_EOT (1<<1)
#define GEN7_ROW_CHICKEN2 _MMIO(0xe4f4)
#define GEN7_ROW_CHICKEN2_GT2 _MMIO(0xf4f4)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index b4807497..9856e24 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1272,6 +1272,9 @@ static int cnl_init_workarounds(struct intel_engine_cs *engine)
if (ret)
return ret;
+ /* WaDisableEarlyEOT:cnl */
+ WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN, DISABLE_EARLY_EOT);
+
return 0;
}