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drm/i915/bdw: Use HSW formula for ring freq scaling

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The current formula we use for HSW is not what is in current docs.
However, changing to the HSW formula on my HSW does not improve power
usage, and decreases performance by about 5% in limited xonotic testing.

For gen8, until we know otherwise, or run experiments, let's use
the HSW formula - which should be the same used in the Windows driver
(and thus help make an apples-applies comparison) on gen8.

v2: Use >= 8 instead of > 7 to be consistent with all other gen
checks.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2013-11-02 21:07:49 -07:00 committed by Daniel Vetter
parent ed8546ac1f
commit 46c764d41f
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/intel_pm.c
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@ -3924,7 +3924,10 @@ void gen6_update_ring_freq(struct drm_device *dev)
int diff = dev_priv->rps.max_delay - gpu_freq;
unsigned int ia_freq = 0, ring_freq = 0;
if (IS_HASWELL(dev)) {
if (INTEL_INFO(dev)->gen >= 8) {
/* max(2 * GT, DDR). NB: GT is 50MHz units */
ring_freq = max(min_ring_freq, gpu_freq);
} else if (IS_HASWELL(dev)) {
ring_freq = mult_frac(gpu_freq, 5, 4);
ring_freq = max(min_ring_freq, ring_freq);
/* leave ia_freq as the default, chosen by cpufreq */