drm/i915: wire up gmbus irq handler

Only enables the interrupt and puts a irq handler into place, doesn't
do anything yet.

Unfortunately there's no gmbus interrupt support for gen2/3 (safe for
pnv, but there the irq is marked as "Test mode").

v2: Wire up the irq handler for vlv and gen4 properly.

v3: i915_enable_pipestat expects the mask bit, not the status bits ... and
for added hilarity those are rather inconsistently named.

Reviewed-by: Imre Deak <imre.deak@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 02a13ab..956b95f 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -525,6 +525,11 @@ static void gen6_queue_rps_work(struct drm_i915_private *dev_priv,
        queue_work(dev_priv->wq, &dev_priv->rps.work);
 }
 
+static void gmbus_irq_handler(struct drm_device *dev)
+{
+       DRM_DEBUG_DRIVER("GMBUS interrupt\n");
+}
+
 static irqreturn_t valleyview_irq_handler(int irq, void *arg)
 {
        struct drm_device *dev = (struct drm_device *) arg;
@@ -590,6 +595,9 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
                        I915_READ(PORT_HOTPLUG_STAT);
                }
 
+               if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
+                       gmbus_irq_handler(dev);
+
                if (pm_iir & GEN6_PM_DEFERRED_EVENTS)
                        gen6_queue_rps_work(dev_priv, pm_iir);
 
@@ -616,7 +624,7 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
                                 SDE_AUDIO_POWER_SHIFT);
 
        if (pch_iir & SDE_GMBUS)
-               DRM_DEBUG_DRIVER("PCH GMBUS interrupt\n");
+               gmbus_irq_handler(dev);
 
        if (pch_iir & SDE_AUDIO_HDCP_MASK)
                DRM_DEBUG_DRIVER("PCH HDCP audio interrupt\n");
@@ -662,7 +670,7 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
                DRM_DEBUG_DRIVER("AUX channel interrupt\n");
 
        if (pch_iir & SDE_GMBUS_CPT)
-               DRM_DEBUG_DRIVER("PCH GMBUS interrupt\n");
+               gmbus_irq_handler(dev);
 
        if (pch_iir & SDE_AUDIO_CP_REQ_CPT)
                DRM_DEBUG_DRIVER("Audio CP request interrupt\n");
@@ -1880,12 +1888,14 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
                hotplug_mask = (SDE_CRT_HOTPLUG_CPT |
                                SDE_PORTB_HOTPLUG_CPT |
                                SDE_PORTC_HOTPLUG_CPT |
-                               SDE_PORTD_HOTPLUG_CPT);
+                               SDE_PORTD_HOTPLUG_CPT |
+                               SDE_GMBUS_CPT);
        } else {
                hotplug_mask = (SDE_CRT_HOTPLUG |
                                SDE_PORTB_HOTPLUG |
                                SDE_PORTC_HOTPLUG |
                                SDE_PORTD_HOTPLUG |
+                               SDE_GMBUS |
                                SDE_AUX_MASK);
        }
 
@@ -1945,7 +1955,8 @@ static int ivybridge_irq_postinstall(struct drm_device *dev)
        hotplug_mask = (SDE_CRT_HOTPLUG_CPT |
                        SDE_PORTB_HOTPLUG_CPT |
                        SDE_PORTC_HOTPLUG_CPT |
-                       SDE_PORTD_HOTPLUG_CPT);
+                       SDE_PORTD_HOTPLUG_CPT |
+                       SDE_GMBUS_CPT);
        dev_priv->pch_irq_mask = ~hotplug_mask;
 
        I915_WRITE(SDEIIR, I915_READ(SDEIIR));
@@ -1999,6 +2010,7 @@ static int valleyview_irq_postinstall(struct drm_device *dev)
        POSTING_READ(VLV_IER);
 
        i915_enable_pipestat(dev_priv, 0, pipestat_enable);
+       i915_enable_pipestat(dev_priv, 0, PIPE_GMBUS_EVENT_ENABLE);
        i915_enable_pipestat(dev_priv, 1, pipestat_enable);
 
        I915_WRITE(VLV_IIR, 0xffffffff);
@@ -2483,6 +2495,7 @@ static int i965_irq_postinstall(struct drm_device *dev)
 
        dev_priv->pipestat[0] = 0;
        dev_priv->pipestat[1] = 0;
+       i915_enable_pipestat(dev_priv, 0, PIPE_GMBUS_EVENT_ENABLE);
 
        /*
         * Enable some error detection, note the instruction error mask
@@ -2636,6 +2649,9 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
                if (blc_event || (iir & I915_ASLE_INTERRUPT))
                        intel_opregion_asle_intr(dev);
 
+               if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
+                       gmbus_irq_handler(dev);
+
                /* With MSI, interrupts are only generated when iir
                 * transitions from zero to nonzero.  If another bit got
                 * set while we were handling the existing iir bits, then