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The calibration process at booting will reset registers and bypass cache to make sure the calibration is done. We add mutex protection to avoid unexpected settings while the registration process and calibration are interleaved. Signed-off-by: Shuming Fan <shumingf@realtek.com> Link: https://lore.kernel.org/r/20190826090052.1875-1-shumingf@realtek.com Signed-off-by: Mark Brown <broonie@kernel.org>