mirror of https://gitee.com/openkylin/linux.git
drm/fb-helper: Explain unload sequence a bit better
While reviewing Chris' patches to properly cancel our async workers I checked that this happens after the fbdev is already unregistered. That's the case, but I found a small gap in our docs, fill that in. Note that I don't explain what release_fbi does, because that function will disappear in the next patch ... Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170207141050.1129-1-daniel.vetter@ffwll.ch
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@ -63,7 +63,8 @@ static DEFINE_MUTEX(kernel_fb_helper_lock);
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* drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
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* drm_fb_helper_initial_config(). Drivers with fancier requirements than the
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* default behaviour can override the third step with their own code.
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* Teardown is done with drm_fb_helper_fini().
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* Teardown is done with drm_fb_helper_fini() after the fbdev device is
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* unregisters using drm_fb_helper_unregister_fbi().
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*
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* At runtime drivers should restore the fbdev console by calling
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* drm_fb_helper_restore_fbdev_mode_unlocked() from their &drm_driver.lastclose
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@ -709,7 +710,7 @@ void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
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EXPORT_SYMBOL(drm_fb_helper_prepare);
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/**
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* drm_fb_helper_init - initialize a drm_fb_helper structure
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* drm_fb_helper_init - initialize a &struct drm_fb_helper
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* @dev: drm device
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* @fb_helper: driver-allocated fbdev helper structure to initialize
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* @max_conn_count: max connector count
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@ -823,7 +824,8 @@ EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
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* @fb_helper: driver-allocated fbdev helper
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*
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* A wrapper around unregister_framebuffer, to release the fb_info
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* framebuffer device
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* framebuffer device. This must be called before releasing all resources for
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* @fb_helper by calling drm_fb_helper_fini().
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*/
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void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
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{
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@ -855,6 +857,13 @@ void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
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}
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EXPORT_SYMBOL(drm_fb_helper_release_fbi);
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/**
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* drm_fb_helper_fini - finialize a &struct drm_fb_helper
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* @fb_helper: driver-allocated fbdev helper
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*
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* This cleans up all remaining resources associated with @fb_helper. Must be
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* called after drm_fb_helper_unlink_fbi() was called.
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*/
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void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
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{
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if (!drm_fbdev_emulation)
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