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drm: Introduce drm_fb_helper_prepare()

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To implement hotplug detection in a race-free manner, drivers must call
drm_kms_helper_poll_init() before hotplug events can be triggered. Such
events can be triggered right after any of the encoders or connectors
are initialized. At the same time, if the drm_fb_helper_hotplug_event()
helper is used by a driver, then the poll helper requires some parts of
the FB helper to be initialized to prevent a crash.

At the same time, drm_fb_helper_init() requires information that is not
necessarily available at such an early stage (number of CRTCs and
connectors), so it cannot be used yet.

Add a new helper, drm_fb_helper_prepare(), that initializes the bare
minimum needed to allow drm_kms_helper_poll_init() to execute and any
subsequent hotplug events to be processed properly.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thierry Reding
2014-06-27 17:19:24 +02:00
committed by Dave Airlie
parent 3a4938799d
commit 10a2310265
18 changed files with 72 additions and 28 deletions
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3
drivers/gpu/drm/udl/udl_fb.c
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@@ -583,7 +583,8 @@ int udl_fbdev_init(struct drm_device *dev)
return -ENOMEM;
udl->fbdev = ufbdev;
ufbdev->helper.funcs = &udl_fb_helper_funcs;
drm_fb_helper_prepare(dev, &ufbdev->helper, &udl_fb_helper_funcs);
ret = drm_fb_helper_init(dev, &ufbdev->helper,
1, 1);