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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2015-04-07 16:20:29 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-04-10 08:56:01 +0200 |
| commit | edcf284bfe9c94eab2923b13cfff7456c0dc7dc6 (patch) | |
| tree | e50f2d4799757730e797326a4b02ee0b02b49750 /drivers | |
| parent | 8fb55197e64d5988ec57b54e973daeea72c3f2ff (diff) | |
| download | lwn-edcf284bfe9c94eab2923b13cfff7456c0dc7dc6.tar.gz lwn-edcf284bfe9c94eab2923b13cfff7456c0dc7dc6.zip | |
drm/i915: Fix computation of last_adjustment for RPS autotuning
The issue is that by computing the last_adj value after applying the
clamping, we can end up with a bogus value for feeding into the next RPS
autotuning step.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Deepak S <deepak.s@linux.intel.com>
Reviewed-by: Deepak S <deepak.s@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_irq.c | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 128a6f40b450..8b5e0358c592 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -1095,21 +1095,20 @@ static void gen6_pm_rps_work(struct work_struct *work) pm_iir |= vlv_wa_c0_ei(dev_priv, pm_iir); adj = dev_priv->rps.last_adj; + new_delay = dev_priv->rps.cur_freq; if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) { if (adj > 0) adj *= 2; - else { - /* CHV needs even encode values */ - adj = IS_CHERRYVIEW(dev_priv->dev) ? 2 : 1; - } - new_delay = dev_priv->rps.cur_freq + adj; - + else /* CHV needs even encode values */ + adj = IS_CHERRYVIEW(dev_priv) ? 2 : 1; /* * For better performance, jump directly * to RPe if we're below it. */ - if (new_delay < dev_priv->rps.efficient_freq) + if (new_delay < dev_priv->rps.efficient_freq - adj) { new_delay = dev_priv->rps.efficient_freq; + adj = 0; + } } else if (pm_iir & GEN6_PM_RP_DOWN_TIMEOUT) { if (dev_priv->rps.cur_freq > dev_priv->rps.efficient_freq) new_delay = dev_priv->rps.efficient_freq; @@ -1119,24 +1118,22 @@ static void gen6_pm_rps_work(struct work_struct *work) } else if (pm_iir & GEN6_PM_RP_DOWN_THRESHOLD) { if (adj < 0) adj *= 2; - else { - /* CHV needs even encode values */ - adj = IS_CHERRYVIEW(dev_priv->dev) ? -2 : -1; - } - new_delay = dev_priv->rps.cur_freq + adj; + else /* CHV needs even encode values */ + adj = IS_CHERRYVIEW(dev_priv) ? -2 : -1; } else { /* unknown event */ - new_delay = dev_priv->rps.cur_freq; + adj = 0; } + dev_priv->rps.last_adj = adj; + /* sysfs frequency interfaces may have snuck in while servicing the * interrupt */ + new_delay += adj; new_delay = clamp_t(int, new_delay, dev_priv->rps.min_freq_softlimit, dev_priv->rps.max_freq_softlimit); - dev_priv->rps.last_adj = new_delay - dev_priv->rps.cur_freq; - intel_set_rps(dev_priv->dev, new_delay); mutex_unlock(&dev_priv->rps.hw_lock); |