• Thierry Reding's avatar
    drm: Introduce drm_fb_helper_prepare() · 10a23102
    Thierry Reding authored
    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: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
    Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
    10a23102
exynos_drm_fbdev.c 9.46 KB