From: Tom O'Rourke <Tom.O'Rourke@xxxxxxxxx>
Set the min_freq_softlimit to max(RPe, 450MHz).
Setting a floor can ensure a minimum experience
level. The 450MHz value came from a power and
performance study of various types of workloads
(3D, Media, GPGPU, idle, etc).
Signed-off-by: Tom O'Rourke <Tom.O'Rourke@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index e4347d9..1244ff8 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4779,7 +4779,8 @@ static void gen8_enable_rps(struct drm_device *dev)
if (IS_BROADWELL(dev)) {
hsw_use_efficient_freq(dev_priv);
- dev_priv->rps.min_freq_softlimit = dev_priv->rps.efficient_freq;
+ dev_priv->rps.min_freq_softlimit =
+ max(dev_priv->rps.efficient_freq, (u8) 9); /* 450 MHz */
}
/* 2b: Program RC6 thresholds.*/
@@ -4879,7 +4880,8 @@ static void gen6_enable_rps(struct drm_device *dev)
if (IS_HASWELL(dev)) {
hsw_use_efficient_freq(dev_priv);
- dev_priv->rps.min_freq_softlimit = dev_priv->rps.efficient_freq;
+ dev_priv->rps.min_freq_softlimit =
+ max(dev_priv->rps.efficient_freq, (u8) 9); /* 450 MHz */
}
/* disable the counters and set deterministic thresholds */
--
1.7.9.5
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