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drm/i915: dynamic render p-state support for Sandy Bridge

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Add an interrupt handler for switching graphics frequencies and handling
PM interrupts.  This should allow for increased performance when busy
and lower power consumption when idle.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Jesse Barnes
2010-12-17 14:19:02 -08:00
committed by Chris Wilson
parent 9c3d2f7ffa
commit 3b8d8d91d5
7 changed files with 136 additions and 19 deletions
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47
drivers/gpu/drm/i915/i915_irq.c
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@@ -397,11 +397,49 @@ static void notify_ring(struct drm_device *dev,
jiffies + msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD));
}
static void gen6_pm_irq_handler(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u8 new_delay = dev_priv->cur_delay;
u32 pm_iir;
pm_iir = I915_READ(GEN6_PMIIR);
if (!pm_iir)
return;
if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) {
if (dev_priv->cur_delay != dev_priv->max_delay)
new_delay = dev_priv->cur_delay + 1;
if (new_delay > dev_priv->max_delay)
new_delay = dev_priv->max_delay;
} else if (pm_iir & (GEN6_PM_RP_DOWN_THRESHOLD | GEN6_PM_RP_DOWN_TIMEOUT)) {
if (dev_priv->cur_delay != dev_priv->min_delay)
new_delay = dev_priv->cur_delay - 1;
if (new_delay < dev_priv->min_delay) {
new_delay = dev_priv->min_delay;
I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
I915_READ(GEN6_RP_INTERRUPT_LIMITS) |
((new_delay << 16) & 0x3f0000));
} else {
/* Make sure we continue to get down interrupts
* until we hit the minimum frequency */
I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
I915_READ(GEN6_RP_INTERRUPT_LIMITS) & ~0x3f0000);
}
}
gen6_set_rps(dev, new_delay);
dev_priv->cur_delay = new_delay;
I915_WRITE(GEN6_PMIIR, pm_iir);
}
static irqreturn_t ironlake_irq_handler(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int ret = IRQ_NONE;
u32 de_iir, gt_iir, de_ier, pch_iir;
u32 de_iir, gt_iir, de_ier, pch_iir, pm_iir;
u32 hotplug_mask;
struct drm_i915_master_private *master_priv;
u32 bsd_usr_interrupt = GT_BSD_USER_INTERRUPT;
@@ -417,8 +455,10 @@ static irqreturn_t ironlake_irq_handler(struct drm_device *dev)
de_iir = I915_READ(DEIIR);
gt_iir = I915_READ(GTIIR);
pch_iir = I915_READ(SDEIIR);
pm_iir = I915_READ(GEN6_PMIIR);
if (de_iir == 0 && gt_iir == 0 && pch_iir == 0)
if (de_iir == 0 && gt_iir == 0 && pch_iir == 0 &&
(!IS_GEN6(dev) || pm_iir == 0))
goto done;
if (HAS_PCH_CPT(dev))
@@ -470,6 +510,9 @@ static irqreturn_t ironlake_irq_handler(struct drm_device *dev)
i915_handle_rps_change(dev);
}
if (IS_GEN6(dev))
gen6_pm_irq_handler(dev);
/* should clear PCH hotplug event before clear CPU irq */
I915_WRITE(SDEIIR, pch_iir);
I915_WRITE(GTIIR, gt_iir);