diff options
Diffstat (limited to 'drivers/gpu/drm/drm_irq.c')
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 28d736c3fcb4..3b04c25100ae 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -62,19 +62,39 @@ #include "drm_internal.h" /** + * DOC: irq helpers + * + * The DRM core provides very simple support helpers to enable IRQ handling on a + * device through the drm_irq_install() and drm_irq_uninstall() functions. This + * only supports devices with a single interrupt on the main device stored in + * &drm_device.dev and set as the device paramter in drm_dev_alloc(). + * + * These IRQ helpers are strictly optional. Drivers which roll their own only + * need to set &drm_device.irq_enabled to signal the DRM core that vblank + * interrupts are working. Since these helpers don't automatically clean up the + * requested interrupt like e.g. devm_request_irq() they're not really + * recommended. + */ + +/** * drm_irq_install - install IRQ handler * @dev: DRM device * @irq: IRQ number to install the handler for * * Initializes the IRQ related data. Installs the handler, calling the driver - * irq_preinstall() and irq_postinstall() functions before and after the - * installation. + * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before + * and after the installation. * * This is the simplified helper interface provided for drivers with no special * needs. Drivers which need to install interrupt handlers for multiple * interrupts must instead set &drm_device.irq_enabled to signal the DRM core * that vblank interrupts are available. * + * @irq must match the interrupt number that would be passed to request_irq(), + * if called directly instead of using this helper function. + * + * &drm_driver.irq_handler is called to handle the registered interrupt. + * * Returns: * Zero on success or a negative error code on failure. */ @@ -136,9 +156,9 @@ EXPORT_SYMBOL(drm_irq_install); * drm_irq_uninstall - uninstall the IRQ handler * @dev: DRM device * - * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. - * This should only be called by drivers which used drm_irq_install() to set up - * their interrupt handler. Other drivers must only reset + * Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ + * handler. This should only be called by drivers which used drm_irq_install() + * to set up their interrupt handler. Other drivers must only reset * &drm_device.irq_enabled to false. * * Note that for kernel modesetting drivers it is a bug if this function fails. |