drm/i915: wrap GEN6_PMIMR changes

Just like we're doing with the other IMR changes.

One of the functional changes is that not every caller was doing the
POSTING_READ.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

4 files changed, 46 insertions, 14 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 6bd4508666d2..af5c335a69db 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -132,6 +132,41 @@ void ilk_disable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask)
         ilk_update_gt_irq(dev_priv, mask, 0);
 }
 
+/**
+  * snb_update_pm_irq - update GEN6_PMIMR
+  * @dev_priv: driver private
+  * @interrupt_mask: mask of interrupt bits to update
+  * @enabled_irq_mask: mask of interrupt bits to enable
+  */
+static void snb_update_pm_irq(struct drm_i915_private *dev_priv,
+                              uint32_t interrupt_mask,
+                              uint32_t enabled_irq_mask)
+{
+        uint32_t pmimr = I915_READ(GEN6_PMIMR);
+        pmimr &= ~interrupt_mask;
+        pmimr |= (~enabled_irq_mask & interrupt_mask);
+
+        assert_spin_locked(&dev_priv->irq_lock);
+
+        I915_WRITE(GEN6_PMIMR, pmimr);
+        POSTING_READ(GEN6_PMIMR);
+}
+
+void snb_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
+{
+        snb_update_pm_irq(dev_priv, mask, mask);
+}
+
+void snb_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
+{
+        snb_update_pm_irq(dev_priv, mask, 0);
+}
+
+static void snb_set_pm_irq(struct drm_i915_private *dev_priv, uint32_t val)
+{
+        snb_update_pm_irq(dev_priv, 0xffffffff, ~val);
+}
+
 static bool ivb_can_enable_err_int(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
@@ -739,15 +774,14 @@ static void gen6_pm_rps_work(struct work_struct *work)
 {
         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
                                                     rps.work);
-        u32 pm_iir, pm_imr;
+        u32 pm_iir;
         u8 new_delay;
 
         spin_lock_irq(&dev_priv->irq_lock);
         pm_iir = dev_priv->rps.pm_iir;
         dev_priv->rps.pm_iir = 0;
-        pm_imr = I915_READ(GEN6_PMIMR);
         /* Make sure not to corrupt PMIMR state used by ringbuffer code */
-        I915_WRITE(GEN6_PMIMR, pm_imr & ~GEN6_PM_RPS_EVENTS);
+        snb_enable_pm_irq(dev_priv, GEN6_PM_RPS_EVENTS);
         spin_unlock_irq(&dev_priv->irq_lock);
 
         if ((pm_iir & GEN6_PM_RPS_EVENTS) == 0)
@@ -921,8 +955,7 @@ static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv,
 
         spin_lock(&dev_priv->irq_lock);
         dev_priv->rps.pm_iir |= pm_iir;
-        I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
-        POSTING_READ(GEN6_PMIMR);
+        snb_set_pm_irq(dev_priv, dev_priv->rps.pm_iir);
         spin_unlock(&dev_priv->irq_lock);
 
         queue_work(dev_priv->wq, &dev_priv->rps.work);
@@ -1005,8 +1038,8 @@ static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv,
         if (pm_iir & GEN6_PM_RPS_EVENTS) {
                 spin_lock(&dev_priv->irq_lock);
                 dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS;
-                I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
-                /* never want to mask useful interrupts. (also posting read) */
+                snb_set_pm_irq(dev_priv, dev_priv->rps.pm_iir);
+                /* never want to mask useful interrupts. */
                 WARN_ON(I915_READ_NOTRACE(GEN6_PMIMR) & ~GEN6_PM_RPS_EVENTS);
                 spin_unlock(&dev_priv->irq_lock);
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a8462064714c..8222f2426b47 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -781,5 +781,8 @@ extern void hsw_restore_lcpll(struct drm_i915_private *dev_priv);
 extern void ilk_enable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 extern void ilk_disable_gt_irq(struct drm_i915_private *dev_priv,
                                uint32_t mask);
+extern void snb_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
+extern void snb_disable_pm_irq(struct drm_i915_private *dev_priv,
+                               uint32_t mask);
 
 #endif /* __INTEL_DRV_H__ */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7bc3f1783174..4f0857346bfd 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3450,7 +3450,7 @@ static void gen6_enable_rps_interrupts(struct drm_device *dev)
 
         spin_lock_irq(&dev_priv->irq_lock);
         WARN_ON(dev_priv->rps.pm_iir);
-        I915_WRITE(GEN6_PMIMR, I915_READ(GEN6_PMIMR) & ~GEN6_PM_RPS_EVENTS);
+        snb_enable_pm_irq(dev_priv, GEN6_PM_RPS_EVENTS);
         I915_WRITE(GEN6_PMIIR, GEN6_PM_RPS_EVENTS);
         spin_unlock_irq(&dev_priv->irq_lock);
         /* only unmask PM interrupts we need. Mask all others. */
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 2e370804248f..7de29d40d1ad 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1062,10 +1062,8 @@ hsw_vebox_get_irq(struct intel_ring_buffer *ring)
 
         spin_lock_irqsave(&dev_priv->irq_lock, flags);
         if (ring->irq_refcount++ == 0) {
-                u32 pm_imr = I915_READ(GEN6_PMIMR);
                 I915_WRITE_IMR(ring, ~ring->irq_enable_mask);
-                I915_WRITE(GEN6_PMIMR, pm_imr & ~ring->irq_enable_mask);
-                POSTING_READ(GEN6_PMIMR);
+                snb_enable_pm_irq(dev_priv, ring->irq_enable_mask);
         }
         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
 
@@ -1084,10 +1082,8 @@ hsw_vebox_put_irq(struct intel_ring_buffer *ring)
 
         spin_lock_irqsave(&dev_priv->irq_lock, flags);
         if (--ring->irq_refcount == 0) {
-                u32 pm_imr = I915_READ(GEN6_PMIMR);
                 I915_WRITE_IMR(ring, ~0);
-                I915_WRITE(GEN6_PMIMR, pm_imr | ring->irq_enable_mask);
-                POSTING_READ(GEN6_PMIMR);
+                snb_disable_pm_irq(dev_priv, ring->irq_enable_mask);
         }
         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
 }