[Intel-gfx] [PATCH 15/18] drm/i915: Enable vebox interrupts

[Ben Widawsky]

Similar to a patch originally written by:

v2: Reversed the meanings of masked and enabled (Haihao)
Made non-destructive writes in case enable/disabler rps runs first
(Haihao)

CC: Xiang, Haihao <haihao.xiang at intel.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_irq.c         | 25 +++++++++++++++++++++++--
 drivers/gpu/drm/i915/i915_reg.h         |  3 +++
 drivers/gpu/drm/i915/intel_ringbuffer.c |  2 +-
 3 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index d3838c6..7714ca6 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -546,8 +546,15 @@ static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv,
 	}
 	spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
 
-	if (pm_iir & ~GEN6_PM_RPS_EVENTS)
-		DRM_ERROR("Unexpected PM interrupted\n");
+	if (pm_iir & ~GEN6_PM_RPS_EVENTS) {
+		if (pm_iir & PM_VEBOX_USER_INTERRUPT)
+			notify_ring(dev_priv->dev, &dev_priv->ring[VECS]);
+
+		if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) {
+			DRM_ERROR("PM error interrupt 0x%08x\n", pm_iir);
+			i915_handle_error(dev_priv->dev, false);
+		}
+	}
 }
 
 static irqreturn_t valleyview_irq_handler(int irq, void *arg)
@@ -2000,6 +2007,20 @@ static int ivybridge_irq_postinstall(struct drm_device *dev)
 	I915_WRITE(SDEIER, hotplug_mask);
 	POSTING_READ(SDEIER);
 
+	I915_WRITE(GEN6_PMIIR, I915_READ(GEN6_PMIIR));
+	if (HAS_VEBOX(dev)) {
+		u32 pm_irqs, pmier, pmimr;
+		pm_irqs = PM_VEBOX_USER_INTERRUPT | PM_VEBOX_CS_ERROR_INTERRUPT;
+
+		/* Our enable/disable rps functions may touch these registers so
+		 * make sure to set a known state for only the non-RPS bits. */
+		pmier = (I915_READ(GEN6_PMIER) & GEN6_PM_RPS_EVENTS) | pm_irqs;
+		pmimr = (I915_READ(GEN6_PMIMR) | ~GEN6_PM_RPS_EVENTS) & ~pm_irqs;
+		I915_WRITE(GEN6_PMIMR, pmimr);
+		I915_WRITE(GEN6_PMIER, pmier);
+	}
+	POSTING_READ(GEN6_PMIER);
+
 	ironlake_enable_pch_hotplug(dev);
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b83928d..885f481 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -717,6 +717,9 @@
 #define GT_RENDER_DEBUG_INTERRUPT		(1 <<  1)
 #define GT_RENDER_USER_INTERRUPT		(1 <<  0)
 
+#define PM_VEBOX_CS_ERROR_INTERRUPT		(1 << 12) /* hsw+ */
+#define PM_VEBOX_USER_INTERRUPT			(1 << 10) /* hsw+ */
+
 /* These are all the "old" interrupts */
 #define ILK_BSD_USER_INTERRUPT				(1<<5)
 #define I915_PIPE_CONTROL_NOTIFY_INTERRUPT		(1<<18)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 5f03abc..9ec00a9 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1766,7 +1766,7 @@ int intel_init_vebox_ring_buffer(struct drm_device *dev)
 	ring->flush = gen6_ring_flush;
 	ring->add_request = gen6_add_request;
 	ring->get_seqno = gen6_ring_get_seqno;
-	ring->irq_enable_mask = 0;
+	ring->irq_enable_mask = PM_VEBOX_USER_INTERRUPT | PM_VEBOX_CS_ERROR_INTERRUPT;
 	ring->irq_get = hsw_vebox_get_irq;
 	ring->irq_put = hsw_vebox_put_irq;
 	ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
-- 
1.8.0