[PATCH 17/19] drm/i915: vlv: factor out valleyview_display_irq_install

Imre Deak
2014-02-17T22:02:57Z

We'll need to disable/re-enable the display-side IRQs when turning
off/on the VLV display power well. Factor out the helper functions
for this. For now keep the display IRQs enabled by default, so the
functionality doesn't change. This will be changed to enable/disable
the IRQs on-demand when adding support for VLV power wells in an
upcoming patch.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
drivers/gpu/drm/i915/i915_dma.c | 1 +
drivers/gpu/drm/i915/i915_drv.h | 5 ++
drivers/gpu/drm/i915/i915_irq.c | 122 ++++++++++++++++++++++++++++++++--------
3 files changed, 103 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index f8f7a59..dca4dc3 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1668,6 +1668,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
goto out_mtrrfree;
}

+ dev_priv->display_irqs_enabled = true;
intel_irq_init(dev);
intel_uncore_sanitize(dev);

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 632f9d8..227c349 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1454,6 +1454,8 @@ typedef struct drm_i915_private {
/* protects the irq masks */
spinlock_t irq_lock;

+ bool display_irqs_enabled;
+
/* To control wakeup latency, e.g. for irq-driven dp aux transfers. */
struct pm_qos_request pm_qos;

@@ -2052,6 +2054,9 @@ void
i915_disable_pipestat(drm_i915_private_t *dev_priv, enum pipe pipe,
u32 status_mask);

+void valleyview_enable_display_irqs(struct drm_i915_private *dev_priv);
+void valleyview_disable_display_irqs(struct drm_i915_private *dev_priv);
+
/* i915_gem.c */
int i915_gem_init_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 75dd0a8..6078d06 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3016,41 +3016,109 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
return 0;
}

+static void valleyview_display_irqs_install(struct drm_i915_private *dev_priv)
+{
+ unsigned long irqflags;
+ u32 pipestat_mask;
+ u32 iir_mask;
+
+ pipestat_mask = PIPESTAT_INT_STATUS_MASK |
+ PIPE_FIFO_UNDERRUN_STATUS;
+ I915_WRITE(PIPESTAT(PIPE_A), pipestat_mask);
+ I915_WRITE(PIPESTAT(PIPE_B), pipestat_mask);
+ POSTING_READ(PIPESTAT(PIPE_A));
+
+ pipestat_mask = PLANE_FLIP_DONE_INT_STATUS_VLV |
+ PIPE_CRC_DONE_INTERRUPT_STATUS;
+
+ spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+ i915_enable_pipestat(dev_priv, PIPE_A, pipestat_mask |
+ PIPE_GMBUS_INTERRUPT_STATUS);
+ i915_enable_pipestat(dev_priv, PIPE_B, pipestat_mask);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+
+ iir_mask = I915_DISPLAY_PORT_INTERRUPT |
+ I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
+ I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
+ dev_priv->irq_mask &= ~iir_mask;
+
+ I915_WRITE(VLV_IIR, iir_mask);
+ I915_WRITE(VLV_IIR, iir_mask);
+ I915_WRITE(VLV_IMR, dev_priv->irq_mask);
+ I915_WRITE(VLV_IER, ~dev_priv->irq_mask);
+ POSTING_READ(VLV_IER);
+}
+
+static void valleyview_display_irqs_uninstall(struct drm_i915_private *dev_priv)
+{
+ unsigned long irqflags;
+ u32 pipestat_mask;
+ u32 iir_mask;
+
+ iir_mask = I915_DISPLAY_PORT_INTERRUPT |
+ I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
+ I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
+ dev_priv->irq_mask |= iir_mask;
+ I915_WRITE(VLV_IER, ~dev_priv->irq_mask);
+ I915_WRITE(VLV_IMR, dev_priv->irq_mask);
+ I915_WRITE(VLV_IIR, iir_mask);
+ I915_WRITE(VLV_IIR, iir_mask);
+ POSTING_READ(VLV_IIR);
+
+ pipestat_mask = PLANE_FLIP_DONE_INT_STATUS_VLV |
+ PIPE_CRC_DONE_INTERRUPT_STATUS;
+
+ spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+ i915_disable_pipestat(dev_priv, PIPE_A, pipestat_mask |
+ PIPE_GMBUS_INTERRUPT_STATUS);
+ i915_disable_pipestat(dev_priv, PIPE_B, pipestat_mask);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+
+ pipestat_mask = PIPESTAT_INT_STATUS_MASK |
+ PIPE_FIFO_UNDERRUN_STATUS;
+ I915_WRITE(PIPESTAT(PIPE_A), pipestat_mask);
+ I915_WRITE(PIPESTAT(PIPE_B), pipestat_mask);
+ POSTING_READ(PIPESTAT(PIPE_A));
+}
+
+void valleyview_enable_display_irqs(struct drm_i915_private *dev_priv)
+{
+ if (dev_priv->display_irqs_enabled)
+ return;
+
+ dev_priv->display_irqs_enabled = true;
+
+ if (dev_priv->dev->irq_enabled)
+ valleyview_display_irqs_install(dev_priv);
+}
+
+void valleyview_disable_display_irqs(struct drm_i915_private *dev_priv)
+{
+ if (!dev_priv->display_irqs_enabled)
+ return;
+
+ dev_priv->display_irqs_enabled = false;
+
+ if (dev_priv->dev->irq_enabled)
+ valleyview_display_irqs_uninstall(dev_priv);
+}
+
static int valleyview_irq_postinstall(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
- u32 enable_mask;
- u32 pipestat_enable = PLANE_FLIP_DONE_INT_STATUS_VLV |
- PIPE_CRC_DONE_INTERRUPT_STATUS;
- unsigned long irqflags;

- enable_mask = I915_DISPLAY_PORT_INTERRUPT;
- enable_mask |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
- I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
-
- /*
- *Leave vblank interrupts masked initially. enable/disable will
- * toggle them based on usage.
- */
- dev_priv->irq_mask = ~enable_mask;
+ dev_priv->irq_mask = ~0;

I915_WRITE(PORT_HOTPLUG_EN, 0);
POSTING_READ(PORT_HOTPLUG_EN);

I915_WRITE(VLV_IMR, dev_priv->irq_mask);
- I915_WRITE(VLV_IER, enable_mask);
+ I915_WRITE(VLV_IER, ~dev_priv->irq_mask);
I915_WRITE(VLV_IIR, 0xffffffff);
- I915_WRITE(PIPESTAT(0), 0xffff);
- I915_WRITE(PIPESTAT(1), 0xffff);
POSTING_READ(VLV_IER);

- /* Interrupt setup is already guaranteed to be single-threaded, this is
- * just to make the assert_spin_locked check happy. */
- spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
- i915_enable_pipestat(dev_priv, PIPE_A, pipestat_enable);
- i915_enable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_INTERRUPT_STATUS);
- i915_enable_pipestat(dev_priv, PIPE_B, pipestat_enable);
- spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+ if (dev_priv->display_irqs_enabled)
+ valleyview_display_irqs_install(dev_priv);

I915_WRITE(VLV_IIR, 0xffffffff);
I915_WRITE(VLV_IIR, 0xffffffff);
@@ -3193,8 +3261,12 @@ static void valleyview_irq_uninstall(struct drm_device *dev)
I915_WRITE(HWSTAM, 0xffffffff);
I915_WRITE(PORT_HOTPLUG_EN, 0);
I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
- for_each_pipe(pipe)
- I915_WRITE(PIPESTAT(pipe), 0xffff);
+
+ if (dev_priv->display_irqs_enabled)
+ valleyview_display_irqs_uninstall(dev_priv);
+
+ dev_priv->irq_mask = 0;
+
I915_WRITE(VLV_IIR, 0xffffffff);
I915_WRITE(VLV_IMR, 0xffffffff);
I915_WRITE(VLV_IER, 0x0);
--
1.8.4