Avoid possible deadlock on context switch.
Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_workarounds.c | 5 +++++
drivers/gpu/drm/i915/i915_reg.h | 2 ++
2 files changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 4b7740aaf3bf..3bacf3d9684e 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1276,6 +1276,11 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
wa_masked_en(wal,
GEN9_CS_DEBUG_MODE1,
FF_DOP_CLOCK_GATE_DISABLE);
+
+ /* Wa_1607138336:tgl */
+ wa_write_or(wal,
+ GEN9_CTX_PREEMPT_REG,
+ GEN12_DISABLE_POSH_BUSY_FF_DOP_CG);
}
if (IS_GEN(i915, 11)) {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 51c3e7975d6b..19ac01057528 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7676,6 +7676,8 @@ enum {
#define GEN9_CS_DEBUG_MODE1 _MMIO(0x20ec)
#define FF_DOP_CLOCK_GATE_DISABLE BIT(1)
#define GEN9_CTX_PREEMPT_REG _MMIO(0x2248)
+ #define GEN12_DISABLE_POSH_BUSY_FF_DOP_CG (1 << 11)
+
#define GEN8_CS_CHICKEN1 _MMIO(0x2580)
#define GEN9_PREEMPT_3D_OBJECT_LEVEL (1 << 0)
#define GEN9_PREEMPT_GPGPU_LEVEL(hi, lo) (((hi) << 2) | ((lo) << 1))
--
2.17.1
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