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drm/i915: Keep min freq above floor on HSW/BDW 

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).

v2: rebased

Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Tom O'Rourke 2014-11-19 14:21:53 -08:00 committed by Daniel Vetter
parent 93ee29203f
commit f4ab408c4b
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/intel_pm.c
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@ -4643,7 +4643,8 @@ static void gen6_init_rps_frequencies(struct drm_device *dev)
if (dev_priv->rps.min_freq_softlimit == 0) {
if (IS_HASWELL(dev) || IS_BROADWELL(dev))
dev_priv->rps.min_freq_softlimit =
dev_priv->rps.efficient_freq;
/* max(RPe, 450 MHz) */
max(dev_priv->rps.efficient_freq, (u8) 9);
else
dev_priv->rps.min_freq_softlimit =
dev_priv->rps.min_freq;