From: Ville Syrjälä <ville.syrj...@linux.intel.com>
GEN8_L3SQCREG1 isn't saved in the context (verified by going through
a context dump), and so we shouldn't be using the ring w/a code to
initialize it. Also Bspec explicitly talks about MMIO and writing it
with the CPU.
Additionally there's another w/a WaTempDisableDOPClkGating:bdw which
tells us to disable DOP clock gating around the GEN8_L3SQCREG1 write
to make sure everyone notices the change. So let's do that as well.
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++++
drivers/gpu/drm/i915/intel_ringbuffer.c | 3 ---
2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 206bd41..5ec56b6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6165,6 +6165,7 @@ static void broadwell_init_clock_gating(struct drm_device
*dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
enum pipe pipe;
+ uint32_t misccpctl;
ilk_init_lp_watermarks(dev);
@@ -6195,6 +6196,15 @@ static void broadwell_init_clock_gating(struct
drm_device *dev)
I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+ /*
+ * WaProgramL3SqcReg1Default:bdw
+ * WaTempDisableDOPClkGating:bdw
+ */
+ misccpctl = I915_READ(GEN7_MISCCPCTL);
+ I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
+ I915_WRITE(GEN8_L3SQCREG1, BDW_WA_L3SQCREG1_DEFAULT);
+ I915_WRITE(GEN7_MISCCPCTL, misccpctl);
+
lpt_init_clock_gating(dev);
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 9b96ed7..50cdd67 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -853,9 +853,6 @@ static int bdw_init_workarounds(struct intel_engine_cs
*ring)
GEN6_WIZ_HASHING_MASK,
GEN6_WIZ_HASHING_16x4);
- /* WaProgramL3SqcReg1Default:bdw */
- WA_WRITE(GEN8_L3SQCREG1, BDW_WA_L3SQCREG1_DEFAULT);
-
return 0;
}
--
2.0.5
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