I believe this will be necessary on production hardware.
Signed-off-by: Kenneth Graunke <[email protected]>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_pm.c | 4 ++++
2 files changed, 7 insertions(+)
I just realized tonight that my workarounds series never got merged.
After reviewing Ben and Chris's comments, I agree with all of them, so
I've dropped the unnecessary patches. I also believe I shouldn't need
the pre-production workarounds I sent last time, so I've dropped those.
These two should apply to production hardware, so we probably want them.
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ad75ff7..f36d5e0 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5050,6 +5050,9 @@
#define GEN7_SINGLE_SUBSCAN_DISPATCH_ENABLE (1<<10)
#define GEN7_PSD_SINGLE_PORT_DISPATCH_ENABLE (1<<3)
+#define GEN8_ROW_CHICKEN 0xe4f0
+#define PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE (1<<8)
+
#define GEN7_ROW_CHICKEN2 0xe4f4
#define GEN7_ROW_CHICKEN2_GT2 0xf4f4
#define DOP_CLOCK_GATING_DISABLE (1<<0)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 4f01b04..df8ad21 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4838,6 +4838,10 @@ static void gen8_init_clock_gating(struct drm_device
*dev)
/* FIXME(BDW): Check all the w/a, some might only apply to
* pre-production hw. */
+ /* WaDisablePartialInstShootdown */
+ I915_WRITE(GEN8_ROW_CHICKEN,
+ _MASKED_BIT_ENABLE(PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE));
+
/*
* This GEN8_CENTROID_PIXEL_OPT_DIS W/A is only needed for
* pre-production hardware
--
1.8.4.2
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