drm/i915: move RPS PM_IER enabling to gen6_enable_rps_interrupts

Paulo noticed that we don't enable RPS interrupts via PM_IER in
gen6_enable_rps_interrupts(). This wasn't a problem so far, since the
only place we disabled RPS interrupts was during system/runtime suspend
and after that we reenable all interrupts in the IRQ pre/postinstall
hooks.

In the next patch we'll disable/reenable RPS interrupts during GPU reset
too, but not call IRQ uninstall, pre/postinstall hooks, so there the
above wouldn't work. The logical place for programming PM_IER is
gen6_enable_rps_interrupts() and this also makes the function more
symmetric with gen6_disable_rps_interrupts(), so move the programming
there from the postinstall hooks.

Note that these changes don't affect the ILK RPS interrupt code, which
could be sanitized in a similar way. But that can be done as a
follow-up.

Credits-to: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 8bab2ab..996c293 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -281,10 +281,14 @@ void gen6_enable_rps_interrupts(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
 
        spin_lock_irq(&dev_priv->irq_lock);
+
        WARN_ON(dev_priv->rps.pm_iir);
        WARN_ON(I915_READ(gen6_pm_iir(dev_priv)) & dev_priv->pm_rps_events);
        dev_priv->rps.interrupts_enabled = true;
+       I915_WRITE(gen6_pm_ier(dev_priv), I915_READ(gen6_pm_ier(dev_priv)) |
+                               dev_priv->pm_rps_events);
        gen6_enable_pm_irq(dev_priv, dev_priv->pm_rps_events);
+
        spin_unlock_irq(&dev_priv->irq_lock);
 }
 
@@ -3307,8 +3311,10 @@ static void gen5_gt_irq_postinstall(struct drm_device *dev)
        GEN5_IRQ_INIT(GT, dev_priv->gt_irq_mask, gt_irqs);
 
        if (INTEL_INFO(dev)->gen >= 6) {
-               pm_irqs |= dev_priv->pm_rps_events;
-
+               /*
+                * RPS interrupts will get enabled/disabled on demand when RPS
+                * itself is enabled/disabled.
+                */
                if (HAS_VEBOX(dev))
                        pm_irqs |= PM_VEBOX_USER_INTERRUPT;
 
@@ -3520,7 +3526,11 @@ static void gen8_gt_irq_postinstall(struct drm_i915_private *dev_priv)
        dev_priv->pm_irq_mask = 0xffffffff;
        GEN8_IRQ_INIT_NDX(GT, 0, ~gt_interrupts[0], gt_interrupts[0]);
        GEN8_IRQ_INIT_NDX(GT, 1, ~gt_interrupts[1], gt_interrupts[1]);
-       GEN8_IRQ_INIT_NDX(GT, 2, dev_priv->pm_irq_mask, dev_priv->pm_rps_events);
+       /*
+        * RPS interrupts will get enabled/disabled on demand when RPS itself
+        * is enabled/disabled.
+        */
+       GEN8_IRQ_INIT_NDX(GT, 2, dev_priv->pm_irq_mask, 0);
        GEN8_IRQ_INIT_NDX(GT, 3, ~gt_interrupts[3], gt_interrupts[3]);
 }