[ Upstream commit 0e4c2b6b0c4a4b4014d9424c27e5e79d185229c5 ] Clear TX registers on stop to prevent the SPDIF interface from sending last written word over and over again. Fixes: a2388a498ad2 ("ASoC: fsl: Add S/PDIF CPU DAI driver") Signed-off-by: Matus Gajdos <matuszpd@gmail.com> Reviewed-by: Fabio Estevam <festevam@gmail.com> Link: https://lore.kernel.org/r/20230719164729.19969-1-matuszpd@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>