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)
Cc: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>
Cc: Praveen Paneri <praveen.paneri@xxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_pm.c | 4 ++++
2 files changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3bec6b1..f2a42a3 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8220,6 +8220,9 @@ enum {
#define GAMW_ECO_DEV_RW_IA_REG _MMIO(0x4080)
#define GAMW_ECO_DEV_CTX_RELOAD_DISABLE (1 << 7)
+#define GEN10_DFR_RATIO_EN_AND_CHICKEN _MMIO(0x9550)
+#define DFR_DISABLE (1 << 9)
+
#define TR_VA_TTL3_PTR_DW0 _MMIO(0x4DE0)
#define TR_VA_TTL3_PTR_DW1 _MMIO(0x4DE4)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c5bf71b..8f1d028 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8505,6 +8505,10 @@ static void icl_init_clock_gating(struct drm_i915_private *dev_priv)
I915_WRITE(_3D_CHICKEN3,
_MASKED_BIT_ENABLE(_3D_CHICKEN3_AA_LINE_QUALITY_FIX_ENABLE));
+ /* 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));
+
/* WaInPlaceDecompressionHang:icl */
I915_WRITE(GEN9_GAMT_ECO_REG_RW_IA, (I915_READ(GEN9_GAMT_ECO_REG_RW_IA) |
GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS));
--
1.9.1
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