Sampler Dynamic Frequency Rebalancing (DFR) aims to reduce Sampler
power by dynamically changing its clock frequency in low-throughput
conditions. This patches enables it by default on Gen11.
v2: Wrong operation to clear the bit (Praveen)
v3: Rebased on top of the WA refactoring
v4: Move to icl_init_clock_gating, since it's not a WA (Rodrigo)
v5: C, not lisp (Chris)
Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Cc: Praveen Paneri <praveen.paneri@xxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_pm.c | 9 ++++++++-
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2b22d4d..6aad16e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8253,6 +8253,9 @@ enum {
#define GEN8_GARBCNTL _MMIO(0xB004)
#define GEN9_GAPS_TSV_CREDIT_DISABLE (1<<7)
+#define GEN10_DFR_RATIO_EN_AND_CHICKEN _MMIO(0x9550)
+#define DFR_DISABLE (1 << 9)
+
/* IVYBRIDGE DPF */
#define GEN7_L3CDERRST1(slice) _MMIO(0xB008 + (slice) * 0x200) /* L3CD Error Status 1 */
#define GEN7_L3CDERRST1_ROW_MASK (0x7ff<<14)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9c6e48c..b85229e 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8664,6 +8664,13 @@ static void gen8_set_l3sqc_credits(struct drm_i915_private *dev_priv,
I915_WRITE(GEN7_MISCCPCTL, misccpctl);
}
+static void icl_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+ /* This is not an Wa. Enable to reduce Sampler power */
+ I915_WRITE(GEN10_DFR_RATIO_EN_AND_CHICKEN,
+ I915_READ(GEN10_DFR_RATIO_EN_AND_CHICKEN) & ~DFR_DISABLE);
+}
+
static void cnp_init_clock_gating(struct drm_i915_private *dev_priv)
{
if (!HAS_PCH_CNP(dev_priv))
@@ -9191,7 +9198,7 @@ static void nop_init_clock_gating(struct drm_i915_private *dev_priv)
void intel_init_clock_gating_hooks(struct drm_i915_private *dev_priv)
{
if (IS_ICELAKE(dev_priv))
- dev_priv->display.init_clock_gating = nop_init_clock_gating;
+ dev_priv->display.init_clock_gating = icl_init_clock_gating;
else if (IS_CANNONLAKE(dev_priv))
dev_priv->display.init_clock_gating = cnl_init_clock_gating;
else if (IS_COFFEELAKE(dev_priv))
--
1.9.1
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