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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
This commit is contained in:
Daniel Vetter 2017-02-07 15:10:49 +01:00
parent 0e70dad083
commit ed84e2542d
1 changed files with 12 additions and 3 deletions
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15
drivers/gpu/drm/drm_fb_helper.c
View File

@ -63,7 +63,8 @@ static DEFINE_MUTEX(kernel_fb_helper_lock);
* drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
* drm_fb_helper_initial_config(). Drivers with fancier requirements than the
* default behaviour can override the third step with their own code.
* Teardown is done with drm_fb_helper_fini().
* Teardown is done with drm_fb_helper_fini() after the fbdev device is
* unregisters using drm_fb_helper_unregister_fbi().
*
* At runtime drivers should restore the fbdev console by calling
* drm_fb_helper_restore_fbdev_mode_unlocked() from their &drm_driver.lastclose
@ -709,7 +710,7 @@ void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
EXPORT_SYMBOL(drm_fb_helper_prepare);
/**
* drm_fb_helper_init - initialize a drm_fb_helper structure
* drm_fb_helper_init - initialize a &struct drm_fb_helper
* @dev: drm device
* @fb_helper: driver-allocated fbdev helper structure to initialize
* @max_conn_count: max connector count
@ -823,7 +824,8 @@ EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
* @fb_helper: driver-allocated fbdev helper
*
* A wrapper around unregister_framebuffer, to release the fb_info
* framebuffer device
* framebuffer device. This must be called before releasing all resources for
* @fb_helper by calling drm_fb_helper_fini().
*/
void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
{
@ -855,6 +857,13 @@ void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
}
EXPORT_SYMBOL(drm_fb_helper_release_fbi);
/**
* drm_fb_helper_fini - finialize a &struct drm_fb_helper
* @fb_helper: driver-allocated fbdev helper
*
* This cleans up all remaining resources associated with @fb_helper. Must be
* called after drm_fb_helper_unlink_fbi() was called.
*/
void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
{
if (!drm_fbdev_emulation)