TX idleness isn't tested, but RX twice. PSC is not disabled when TX is idle
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Acked-by: NManuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>