This workaround supposedly fixes some hangs in the VF unit.
Signed-off-by: Rafael Antognolli <rafael.antognolli@xxxxxxxxx>
Reviewed-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_pm.c | 5 +++++
2 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 09bf043c1c2e..a9a6d6698bb1 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3875,6 +3875,9 @@ enum {
#define SARBUNIT_CLKGATE_DIS (1 << 5)
#define RCCUNIT_CLKGATE_DIS (1 << 7)
+#define UNSLICE_UNIT_LEVEL_CLKGATE _MMIO(0x9434)
+#define VFUNIT_CLKGATE_DIS (1 << 20)
+
/*
* Display engine regs
*/
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a349c4fd51ff..e33842d6bb14 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8448,6 +8448,11 @@ static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
if (IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_B0))
val |= SARBUNIT_CLKGATE_DIS;
I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE, val);
+
+ /* WaDisableVFclkgate:cnl */
+ val = I915_READ(UNSLICE_UNIT_LEVEL_CLKGATE);
+ val |= VFUNIT_CLKGATE_DIS;
+ I915_WRITE(UNSLICE_UNIT_LEVEL_CLKGATE, val);
}
static void cfl_init_clock_gating(struct drm_i915_private *dev_priv)
--
2.14.3
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