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<div class="moz-cite-prefix">On Thursday 27 March 2014 01:54 PM,
Chris Wilson wrote:<br>
</div>
<blockquote
cite="mid:1395908661-7355-3-git-send-email-chris@chris-wilson.co.uk"
type="cite">
<pre wrap="">The speculation is that we can conserve more power by masking off the
interrupts at source (PMINTRMSK) rather than filtering them by the
up/down thresholds (RPINTLIM).
Signed-off-by: Chris Wilson <a class="moz-txt-link-rfc2396E" href="mailto:chris@chris-wilson.co.uk"><chris@chris-wilson.co.uk></a>
Cc: Deepak S <a class="moz-txt-link-rfc2396E" href="mailto:deepak.s@intel.com"><deepak.s@intel.com></a>
Cc: Ville Syrjälä <a class="moz-txt-link-rfc2396E" href="mailto:ville.syrjala@linux.intel.com"><ville.syrjala@linux.intel.com></a>
---
drivers/gpu/drm/i915/intel_pm.c | 32 ++++++++++++++++++++------------
1 file changed, 20 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3ad590924062..0a76e9baeca2 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3006,6 +3006,25 @@ static void gen6_set_rps_thresholds(struct drm_i915_private *dev_priv, u8 val)
dev_priv->rps.last_adj = 0;
}
+static u32 gen6_rps_pm_mask(struct drm_i915_private *dev_priv, u8 val)
+{
+ u32 mask;
+
+ mask = GEN6_PM_RP_DOWN_TIMEOUT;
+ if (val > dev_priv->rps.min_freq_softlimit)
+ mask |= GEN6_PM_RP_DOWN_THRESHOLD;
+ if (val < dev_priv->rps.max_freq_softlimit)
+ mask |= GEN6_PM_RP_UP_THRESHOLD;
+
+ /* IVB and SNB hard hangs on looping batchbuffer
+ * if GEN6_PM_UP_EI_EXPIRED is masked.
+ */
+ if (INTEL_INFO(dev_priv->dev)->gen <= 7 && !IS_HASWELL(dev_priv->dev))
+ mask |= GEN6_PM_RP_UP_EI_EXPIRED;
+
+ return ~mask;
+}
+
/* gen6_set_rps is called to update the frequency request, but should also be
* called when the range (min_delay and max_delay) is modified so that we can
* update the GEN6_RP_INTERRUPT_LIMITS register accordingly. */
@@ -3037,6 +3056,7 @@ void gen6_set_rps(struct drm_device *dev, u8 val)
* until we hit the minimum or maximum frequencies.
*/
I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, gen6_rps_limits(dev_priv, val));
+ I915_WRITE(GEN6_PMINTRMSK, gen6_rps_pm_mask(dev_priv, val));
POSTING_READ(GEN6_RPNSWREQ);
@@ -3220,24 +3240,12 @@ int intel_enable_rc6(const struct drm_device *dev)
static void gen6_enable_rps_interrupts(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- u32 enabled_intrs;
spin_lock_irq(&dev_priv->irq_lock);
WARN_ON(dev_priv->rps.pm_iir);
snb_enable_pm_irq(dev_priv, dev_priv->pm_rps_events);
I915_WRITE(GEN6_PMIIR, dev_priv->pm_rps_events);
spin_unlock_irq(&dev_priv->irq_lock);
-
- /* only unmask PM interrupts we need. Mask all others. */
- enabled_intrs = dev_priv->pm_rps_events;
-
- /* IVB and SNB hard hangs on looping batchbuffer
- * if GEN6_PM_UP_EI_EXPIRED is masked.
- */
- if (INTEL_INFO(dev)->gen <= 7 && !IS_HASWELL(dev))
- enabled_intrs |= GEN6_PM_RP_UP_EI_EXPIRED;
-
- I915_WRITE(GEN6_PMINTRMSK, ~enabled_intrs);
}
static void gen8_enable_rps(struct drm_device *dev)
</pre>
</blockquote>
<small>On VLV, gen6_enable_rps_interrupts is used to enable turbo
interrutpts. I think we need to extend gen6_rps_pm_mask</small><small>
to valleyview also?</small><br>
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