wait_event_timeout() usage in decon_wait_for_vblank()

[Bjorn Helgaas]

I don't know this code at all, so this is likely just noise, but the
wait_event_timeout() usage in decon_wait_for_vblank() looks funny to
me.

decon_wait_for_vblank() waits on wait_vsync_queue for wait_vsync_event
to be cleared.

But decon_irq_handler() only clears wait_vsync_event and wakes up
wait_vsync_queue when !ctx->i80_if.

I don't see any i80_if connection in decon_wait_for_vblank().  Does
the wait always time out if i80_if is set?  Is there some reason we
don't use decon_wait_for_vblank() at all if i80_if is set?

Bjorn