drm/i915: Setup static bias for GPU
Based on the spec, Setting up static BIAS for GPU to improve the
rps performace.
v2: rename reg defn to match spec. (Ville)
v3: Updated bias setting for chv (Deepak)
Signed-off-by: Deepak S <deepak.s@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a7516ed..8812fff 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5082,6 +5082,12 @@
GEN6_RP_UP_BUSY_AVG |
GEN6_RP_DOWN_IDLE_AVG);
+ /* Setting Fixed Bias */
+ val = VLV_OVERRIDE_EN |
+ VLV_SOC_TDP_EN |
+ CHV_BIAS_CPU_50_SOC_50;
+ vlv_punit_write(dev_priv, VLV_TURBO_SOC_OVERRIDE, val);
+
val = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
/* RPS code assumes GPLL is used */
@@ -5166,6 +5172,12 @@
I915_WRITE(GEN6_RC_CONTROL, rc6_mode);
+ /* Setting Fixed Bias */
+ val = VLV_OVERRIDE_EN |
+ VLV_SOC_TDP_EN |
+ VLV_BIAS_CPU_125_SOC_875;
+ vlv_punit_write(dev_priv, VLV_TURBO_SOC_OVERRIDE, val);
+
val = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
/* RPS code assumes GPLL is used */