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drm/i915: kerneldoc for interrupt enable/disable functions

Browse Source 
Just start with the basics for now.

Since there's a lot of different functionality in i915_irq.c I've
decided to split it into different sections and pull in just the
relevant functions. Splitting into different files looks like a lot
more work since the interrupt handlers do an awful lot of reuse all
over.

v2: Rebase onto changed function names.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2014-09-30 10:56:45 +02:00
parent b963291cf9
commit fca52a5565
2 changed files with 68 additions and 2 deletions
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9
Documentation/DocBook/drm.tmpl
View File

@ -3798,6 +3798,14 @@ int num_ioctls;</synopsis>
!Pdrivers/gpu/drm/i915/intel_runtime_pm.c runtime pm
!Idrivers/gpu/drm/i915/intel_runtime_pm.c
</sect2>
<sect2>
<title>Interrupt Handling</title>
!Pdrivers/gpu/drm/i915/i915_irq.c interrupt handling
!Fdrivers/gpu/drm/i915/i915_irq.c intel_irq_init intel_irq_init_hw intel_hpd_init
!Fdrivers/gpu/drm/i915/i915_irq.c intel_irq_fini
!Fdrivers/gpu/drm/i915/i915_irq.c intel_runtime_pm_disable_interrupts
!Fdrivers/gpu/drm/i915/i915_irq.c intel_runtime_pm_enable_interrupts
</sect2>
</sect1>
<sect1>
<title>Display Hardware Handling</title>
@ -3951,5 +3959,6 @@ int num_ioctls;</synopsis>
</sect2>
</sect1>
</chapter>
!Cdrivers/gpu/drm/i915/i915_irq.c
</part>
</book>

61
drivers/gpu/drm/i915/i915_irq.c
View File

@ -37,6 +37,14 @@
#include "i915_trace.h"
#include "intel_drv.h"
/**
* DOC: interrupt handling
*
* These functions provide the basic support for enabling and disabling the
* interrupt handling support. There's a lot more functionality in i915_irq.c
* and related files, but that will be described in separate chapters.
*/
static const u32 hpd_ibx[] = {
[HPD_CRT] = SDE_CRT_HOTPLUG,
[HPD_SDVO_B] = SDE_SDVOB_HOTPLUG,
@ -4650,6 +4658,13 @@ static void intel_hpd_irq_reenable_work(struct work_struct *work)
intel_runtime_pm_put(dev_priv);
}
/**
* intel_irq_init - initializes irq support
* @dev_priv: i915 device instance
*
* This function initializes all the irq support including work items, timers
* and all the vtables. It does not setup the interrupt itself though.
*/
void intel_irq_init(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
@ -4755,6 +4770,18 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
}
}
/**
* intel_hpd_init - initializes and enables hpd support
* @dev_priv: i915 device instance
*
* This function enables the hotplug support. It requires that interrupts have
* already been enabled with intel_irq_init_hw(). From this point on hotplug and
* poll request can run concurrently to other code, so locking rules must be
* obeyed.
*
* This is a separate step from interrupt enabling to simplify the locking rules
* in the driver load and resume code.
*/
void intel_hpd_init(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
@ -4783,6 +4810,17 @@ void intel_hpd_init(struct drm_i915_private *dev_priv)
spin_unlock_irq(&dev_priv->irq_lock);
}
/**
* intel_irq_install - enables the hardware interrupt
* @dev_priv: i915 device instance
*
* This function enables the hardware interrupt handling, but leaves the hotplug
* handling still disabled. It is called after intel_irq_init().
*
* In the driver load and resume code we need working interrupts in a few places
* but don't want to deal with the hassle of concurrent probe and hotplug
* workers. Hence the split into this two-stage approach.
*/
int intel_irq_install(struct drm_i915_private *dev_priv)
{
/*
@ -4795,6 +4833,13 @@ int intel_irq_install(struct drm_i915_private *dev_priv)
return drm_irq_install(dev_priv->dev, dev_priv->dev->pdev->irq);
}
/**
* intel_irq_uninstall - finilizes all irq handling
* @dev_priv: i915 device instance
*
* This stops interrupt and hotplug handling and unregisters and frees all
* resources acquired in the init functions.
*/
void intel_irq_uninstall(struct drm_i915_private *dev_priv)
{
drm_irq_uninstall(dev_priv->dev);
@ -4802,14 +4847,26 @@ void intel_irq_uninstall(struct drm_i915_private *dev_priv)
dev_priv->pm.irqs_enabled = false;
}
/* Disable interrupts so we can allow runtime PM. */
/**
* intel_runtime_pm_disable_interrupts - runtime interrupt disabling
* @dev_priv: i915 device instance
*
* This function is used to disable interrupts at runtime, both in the runtime
* pm and the system suspend/resume code.
*/
void intel_runtime_pm_disable_interrupts(struct drm_i915_private *dev_priv)
{
dev_priv->dev->driver->irq_uninstall(dev_priv->dev);
dev_priv->pm.irqs_enabled = false;
}
/* Restore interrupts so we can recover from runtime PM. */
/**
* intel_runtime_pm_enable_interrupts - runtime interrupt enabling
* @dev_priv: i915 device instance
*
* This function is used to enable interrupts at runtime, both in the runtime
* pm and the system suspend/resume code.
*/
void intel_runtime_pm_enable_interrupts(struct drm_i915_private *dev_priv)
{
dev_priv->pm.irqs_enabled = true;