From: Tim Gore <tim.gore@xxxxxxxxx>
This is to fix a GPU hang seen with mid thread pre-emption
and pooled EUs.
v2. Use IS_BXT_REVID instead of IS_BROXTON and INTEL_REVID
v3. And use correct type for register addresses
Signed-off-by: Tim Gore <tim.gore@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 12 ++++++++++++
drivers/gpu/drm/i915/intel_lrc.c | 19 +++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 06fb589..c54190b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1783,6 +1783,18 @@ enum skl_disp_power_wells {
#define GEN9_IZ_HASHING_MASK(slice) (0x3 << ((slice) * 2))
#define GEN9_IZ_HASHING(slice, val) ((val) << ((slice) * 2))
+/* WaClearTdlStateAckDirtyBits */
+#define GEN8_STATE_ACK _MMIO(0x20F0)
+#define GEN9_STATE_ACK_SLICE1 _MMIO(0x20F8)
+#define GEN9_STATE_ACK_SLICE2 _MMIO(0x2100)
+#define GEN9_STATE_ACK_TDL0 (1 << 12)
+#define GEN9_STATE_ACK_TDL1 (1 << 13)
+#define GEN9_STATE_ACK_TDL2 (1 << 14)
+#define GEN9_STATE_ACK_TDL3 (1 << 15)
+#define GEN9_SUBSLICE_TDL_ACK_BITS \
+ (GEN9_STATE_ACK_TDL3 | GEN9_STATE_ACK_TDL2 | \
+ GEN9_STATE_ACK_TDL1 | GEN9_STATE_ACK_TDL0)
+
#define GFX_MODE _MMIO(0x2520)
#define GFX_MODE_GEN7 _MMIO(0x229c)
#define RING_MODE_GEN7(ring) _MMIO((ring)->mmio_base+0x29c)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 3a23b95..b6dcd4d 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1450,6 +1450,25 @@ static int gen9_init_perctx_bb(struct intel_engine_cs *engine,
wa_ctx_emit(batch, index, MI_NOOP);
}
+ /* WaClearTdlStateAckDirtyBits:bxt */
+ if (IS_BXT_REVID(dev, 0, BXT_REVID_B0)) {
+ wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(4));
+
+ wa_ctx_emit_reg(batch, index, GEN8_STATE_ACK);
+ wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(GEN9_SUBSLICE_TDL_ACK_BITS));
+
+ wa_ctx_emit_reg(batch, index, GEN9_STATE_ACK_SLICE1);
+ wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(GEN9_SUBSLICE_TDL_ACK_BITS));
+
+ wa_ctx_emit_reg(batch, index, GEN9_STATE_ACK_SLICE2);
+ wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(GEN9_SUBSLICE_TDL_ACK_BITS));
+
+ wa_ctx_emit_reg(batch, index, GEN7_ROW_CHICKEN2);
+ /* dummy write to CS, mask bits are 0 to ensure the register is not modified */
+ wa_ctx_emit(batch, index, 0x0);
+ wa_ctx_emit(batch, index, MI_NOOP);
+ }
+
/* WaDisableCtxRestoreArbitration:skl,bxt */
if (IS_SKL_REVID(dev, 0, SKL_REVID_D0) ||
IS_BXT_REVID(dev, 0, BXT_REVID_A1))
--
1.9.1
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