提交 b73ba98d 编写于 作者: A Alex Deucher 提交者: Christian König

drm/radeon: document radeon_irq_kms.c

Adds documentation to most of the functions in
radeon_irq_kms.c
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
上级 f482a141
......@@ -34,6 +34,15 @@
#define RADEON_WAIT_IDLE_TIMEOUT 200
/**
* radeon_driver_irq_handler_kms - irq handler for KMS
*
* @DRM_IRQ_ARGS: args
*
* This is the irq handler for the radeon KMS driver (all asics).
* radeon_irq_process is a macro that points to the per-asic
* irq handler callback.
*/
irqreturn_t radeon_driver_irq_handler_kms(DRM_IRQ_ARGS)
{
struct drm_device *dev = (struct drm_device *) arg;
......@@ -45,6 +54,17 @@ irqreturn_t radeon_driver_irq_handler_kms(DRM_IRQ_ARGS)
/*
* Handle hotplug events outside the interrupt handler proper.
*/
/**
* radeon_hotplug_work_func - display hotplug work handler
*
* @work: work struct
*
* This is the hot plug event work handler (all asics).
* The work gets scheduled from the irq handler if there
* was a hot plug interrupt. It walks the connector table
* and calls the hotplug handler for each one, then sends
* a drm hotplug event to alert userspace.
*/
static void radeon_hotplug_work_func(struct work_struct *work)
{
struct radeon_device *rdev = container_of(work, struct radeon_device,
......@@ -61,6 +81,14 @@ static void radeon_hotplug_work_func(struct work_struct *work)
drm_helper_hpd_irq_event(dev);
}
/**
* radeon_driver_irq_preinstall_kms - drm irq preinstall callback
*
* @dev: drm dev pointer
*
* Gets the hw ready to enable irqs (all asics).
* This function disables all interrupt sources on the GPU.
*/
void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
{
struct radeon_device *rdev = dev->dev_private;
......@@ -85,12 +113,27 @@ void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
radeon_irq_process(rdev);
}
/**
* radeon_driver_irq_postinstall_kms - drm irq preinstall callback
*
* @dev: drm dev pointer
*
* Handles stuff to be done after enabling irqs (all asics).
* Returns 0 on success.
*/
int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
{
dev->max_vblank_count = 0x001fffff;
return 0;
}
/**
* radeon_driver_irq_uninstall_kms - drm irq uninstall callback
*
* @dev: drm dev pointer
*
* This function disables all interrupt sources on the GPU (all asics).
*/
void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
{
struct radeon_device *rdev = dev->dev_private;
......@@ -116,6 +159,16 @@ void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
}
/**
* radeon_msi_ok - asic specific msi checks
*
* @rdev: radeon device pointer
*
* Handles asic specific MSI checks to determine if
* MSIs should be enabled on a particular chip (all asics).
* Returns true if MSIs should be enabled, false if MSIs
* should not be enabled.
*/
static bool radeon_msi_ok(struct radeon_device *rdev)
{
/* RV370/RV380 was first asic with MSI support */
......@@ -168,6 +221,14 @@ static bool radeon_msi_ok(struct radeon_device *rdev)
return true;
}
/**
* radeon_irq_kms_init - init driver interrupt info
*
* @rdev: radeon device pointer
*
* Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
* Returns 0 for success, error for failure.
*/
int radeon_irq_kms_init(struct radeon_device *rdev)
{
int r = 0;
......@@ -200,6 +261,13 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
return 0;
}
/**
* radeon_irq_kms_fini - tear down driver interrrupt info
*
* @rdev: radeon device pointer
*
* Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
*/
void radeon_irq_kms_fini(struct radeon_device *rdev)
{
drm_vblank_cleanup(rdev->ddev);
......@@ -212,6 +280,16 @@ void radeon_irq_kms_fini(struct radeon_device *rdev)
flush_work_sync(&rdev->hotplug_work);
}
/**
* radeon_irq_kms_sw_irq_get - enable software interrupt
*
* @rdev: radeon device pointer
* @ring: ring whose interrupt you want to enable
*
* Enables the software interrupt for a specific ring (all asics).
* The software interrupt is generally used to signal a fence on
* a particular ring.
*/
void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
{
unsigned long irqflags;
......@@ -226,6 +304,16 @@ void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
}
}
/**
* radeon_irq_kms_sw_irq_put - disable software interrupt
*
* @rdev: radeon device pointer
* @ring: ring whose interrupt you want to disable
*
* Disables the software interrupt for a specific ring (all asics).
* The software interrupt is generally used to signal a fence on
* a particular ring.
*/
void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
{
unsigned long irqflags;
......@@ -240,6 +328,15 @@ void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
}
}
/**
* radeon_irq_kms_pflip_irq_get - enable pageflip interrupt
*
* @rdev: radeon device pointer
* @crtc: crtc whose interrupt you want to enable
*
* Enables the pageflip interrupt for a specific crtc (all asics).
* For pageflips we use the vblank interrupt source.
*/
void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
{
unsigned long irqflags;
......@@ -257,6 +354,15 @@ void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
}
}
/**
* radeon_irq_kms_pflip_irq_put - disable pageflip interrupt
*
* @rdev: radeon device pointer
* @crtc: crtc whose interrupt you want to disable
*
* Disables the pageflip interrupt for a specific crtc (all asics).
* For pageflips we use the vblank interrupt source.
*/
void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
{
unsigned long irqflags;
......@@ -274,6 +380,14 @@ void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
}
}
/**
* radeon_irq_kms_enable_afmt - enable audio format change interrupt
*
* @rdev: radeon device pointer
* @block: afmt block whose interrupt you want to enable
*
* Enables the afmt change interrupt for a specific afmt block (all asics).
*/
void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
{
unsigned long irqflags;
......@@ -285,6 +399,14 @@ void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
}
/**
* radeon_irq_kms_disable_afmt - disable audio format change interrupt
*
* @rdev: radeon device pointer
* @block: afmt block whose interrupt you want to disable
*
* Disables the afmt change interrupt for a specific afmt block (all asics).
*/
void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
{
unsigned long irqflags;
......@@ -295,6 +417,14 @@ void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
}
/**
* radeon_irq_kms_enable_hpd - enable hotplug detect interrupt
*
* @rdev: radeon device pointer
* @hpd_mask: mask of hpd pins you want to enable.
*
* Enables the hotplug detect interrupt for a specific hpd pin (all asics).
*/
void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
{
unsigned long irqflags;
......@@ -307,6 +437,14 @@ void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
}
/**
* radeon_irq_kms_disable_hpd - disable hotplug detect interrupt
*
* @rdev: radeon device pointer
* @hpd_mask: mask of hpd pins you want to disable.
*
* Disables the hotplug detect interrupt for a specific hpd pin (all asics).
*/
void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
{
unsigned long irqflags;
......@@ -319,6 +457,18 @@ void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
}
/**
* radeon_irq_kms_wait_gui_idle - waits for drawing engine to be idle
*
* @rdev: radeon device pointer
*
* Enabled the GUI idle interrupt and waits for it to fire (r6xx+).
* This is currently used to make sure the 3D engine is idle for power
* management, but should be replaces with proper fence waits.
* GUI idle interrupts don't work very well on pre-r6xx hw and it also
* does not take into account other aspects of the chip that may be busy.
* DO NOT USE GOING FORWARD.
*/
int radeon_irq_kms_wait_gui_idle(struct radeon_device *rdev)
{
unsigned long irqflags;
......
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