From a2b16588578f8edd0e39c7a6554b047b13e8ca79 Mon Sep 17 00:00:00 2001
From: Rafael Antognolli <rafael.antognolli@intel.com>
Date: Fri, 15 Dec 2017 16:11:17 -0800
Subject: [PATCH] drm/i915: Implement WaDisableEarlyEOT.
Git-commit: a2b16588578f8edd0e39c7a6554b047b13e8ca79
Patch-mainline: v4.16-rc1
References: FATE#322643 bsc#1055900
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
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_engine_cs.c | 3 +++
2 files changed, 4 insertions(+)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8149,6 +8149,7 @@ 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)
--- 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 i
if (ret)
return ret;
+ /* WaDisableEarlyEOT:cnl */
+ WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN, DISABLE_EARLY_EOT);
+
return 0;
}