From fca52a5565fbf4abc4ee4fca81842dc1f6ecdce8 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Tue, 30 Sep 2014 10:56:45 +0200 Subject: [PATCH] drm/i915: kerneldoc for interrupt enable/disable functions 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 Reviewed-by: Paulo Zanoni Signed-off-by: Daniel Vetter --- Documentation/DocBook/drm.tmpl | 9 +++++ drivers/gpu/drm/i915/i915_irq.c | 61 +++++++++++++++++++++++++++++++-- 2 files changed, 68 insertions(+), 2 deletions(-) diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl index 8627816e58f3..d7cfc98be159 100644 --- a/Documentation/DocBook/drm.tmpl +++ b/Documentation/DocBook/drm.tmpl @@ -3798,6 +3798,14 @@ int num_ioctls; !Pdrivers/gpu/drm/i915/intel_runtime_pm.c runtime pm !Idrivers/gpu/drm/i915/intel_runtime_pm.c + + Interrupt Handling +!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 + Display Hardware Handling @@ -3951,5 +3959,6 @@ int num_ioctls; +!Cdrivers/gpu/drm/i915/i915_irq.c diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 97340a9215ea..737b23982b95 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -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; -- 2.20.1