drm/i915: extract ibx_display_interrupt_update

This way all changes to SDEIMR all go through the same function, with
the exception of the (single-threaded) setup/teardown code.

For paranoia again add an assert_spin_locked.

v2: For even more paranoia also sprinkle a spinlock assert over
cpt_can_enable_serr_int since we need to have that one there, too.

v3: Fix the logic of interrupt enabling, add enable/disable macros for
the simple cases in the fifo code and add a comment. All requested by
Paulo.

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

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 4aedd38..80b88c8 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -128,6 +128,8 @@ static bool cpt_can_enable_serr_int(struct drm_device *dev)
        enum pipe pipe;
        struct intel_crtc *crtc;
 
+       assert_spin_locked(&dev_priv->irq_lock);
+
        for_each_pipe(pipe) {
                crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
 
@@ -170,6 +172,30 @@ static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev,
        }
 }
 
+/**
+ * ibx_display_interrupt_update - update SDEIMR
+ * @dev_priv: driver private
+ * @interrupt_mask: mask of interrupt bits to update
+ * @enabled_irq_mask: mask of interrupt bits to enable
+ */
+static void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,
+                                        uint32_t interrupt_mask,
+                                        uint32_t enabled_irq_mask)
+{
+       uint32_t sdeimr = I915_READ(SDEIMR);
+       sdeimr &= ~interrupt_mask;
+       sdeimr |= (~enabled_irq_mask & interrupt_mask);
+
+       assert_spin_locked(&dev_priv->irq_lock);
+
+       I915_WRITE(SDEIMR, sdeimr);
+       POSTING_READ(SDEIMR);
+}
+#define ibx_enable_display_interrupt(dev_priv, bits) \
+       ibx_display_interrupt_update((dev_priv), (bits), (bits))
+#define ibx_disable_display_interrupt(dev_priv, bits) \
+       ibx_display_interrupt_update((dev_priv), (bits), 0)
+
 static void ibx_set_fifo_underrun_reporting(struct intel_crtc *crtc,
                                            bool enable)
 {
@@ -179,11 +205,9 @@ static void ibx_set_fifo_underrun_reporting(struct intel_crtc *crtc,
                                                SDE_TRANSB_FIFO_UNDER;
 
        if (enable)
-               I915_WRITE(SDEIMR, I915_READ(SDEIMR) & ~bit);
+               ibx_enable_display_interrupt(dev_priv, bit);
        else
-               I915_WRITE(SDEIMR, I915_READ(SDEIMR) | bit);
-
-       POSTING_READ(SDEIMR);
+               ibx_disable_display_interrupt(dev_priv, bit);
 }
 
 static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,
@@ -200,12 +224,10 @@ static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,
                                     SERR_INT_TRANS_B_FIFO_UNDERRUN |
                                     SERR_INT_TRANS_C_FIFO_UNDERRUN);
 
-               I915_WRITE(SDEIMR, I915_READ(SDEIMR) & ~SDE_ERROR_CPT);
+               ibx_enable_display_interrupt(dev_priv, SDE_ERROR_CPT);
        } else {
-               I915_WRITE(SDEIMR, I915_READ(SDEIMR) | SDE_ERROR_CPT);
+               ibx_disable_display_interrupt(dev_priv, SDE_ERROR_CPT);
        }
-
-       POSTING_READ(SDEIMR);
 }
 
 /**
@@ -2652,22 +2674,21 @@ static void ibx_hpd_irq_setup(struct drm_device *dev)
        drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
        struct drm_mode_config *mode_config = &dev->mode_config;
        struct intel_encoder *intel_encoder;
-       u32 mask = ~I915_READ(SDEIMR);
-       u32 hotplug;
+       u32 hotplug_irqs, hotplug, enabled_irqs = 0;
 
        if (HAS_PCH_IBX(dev)) {
-               mask &= ~SDE_HOTPLUG_MASK;
+               hotplug_irqs = SDE_HOTPLUG_MASK;
                list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
                        if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
-                               mask |= hpd_ibx[intel_encoder->hpd_pin];
+                               enabled_irqs |= hpd_ibx[intel_encoder->hpd_pin];
        } else {
-               mask &= ~SDE_HOTPLUG_MASK_CPT;
+               hotplug_irqs = SDE_HOTPLUG_MASK_CPT;
                list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
                        if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
-                               mask |= hpd_cpt[intel_encoder->hpd_pin];
+                               enabled_irqs |= hpd_cpt[intel_encoder->hpd_pin];
        }
 
-       I915_WRITE(SDEIMR, ~mask);
+       ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
 
        /*
         * Enable digital hotplug on the PCH, and configure the DP short pulse