• Sylwester Nawrocki's avatar
    [media] s5p-fimc: Handle sub-device interdependencies using deferred probing · ecd9acbf
    Sylwester Nawrocki authored
    In this driver there are several entities associated with separate
    platform or I2C client devices, which may get probed in random order.
    
    When the platform device bound to the media device driver is probed
    all other entity drivers need to be already in place and initialized.
    If any of them is not, fail the media device probe and return an error
    indicating we need to be retried once any new driver gets registered.
    The media device driver probe will not succeed until there are available
    all needed sub-drivers, as specified in the platform data.
    
    While at it, make sure the s5p-csis module (MIPI-CSI receiver driver)
    does not get unloaded when in use, by guarding its usage with
    try_module_get/module_put.
    
    This patch is a prerequisite for adding the device tree support.
    It now also allows again to unbind/bind the driver at runtime from
    user space via sysfs.
    Signed-off-by: default avatarSylwester Nawrocki <s.nawrocki@samsung.com>
    Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
    Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
    ecd9acbf
fimc-mdevice.c 23 KB