From 16736a0221db6d6f3fe130750c6dc5bbf5417da4 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Sat, 4 Dec 2021 17:37:08 +0300 Subject: [PATCH] ASoC: tegra20: spdif: Set FIFO trigger level FIFO trigger level must be not less than the size of DMA burst, otherwise audio will be played x4 faster that it should be because part of the DMA data will be dropped on FIFO input buffer overflow. Signed-off-by: Dmitry Osipenko Acked-by: Thierry Reding Link: https://lore.kernel.org/r/20211204143725.31646-6-digetx@gmail.com Signed-off-by: Mark Brown --- sound/soc/tegra/tegra20_spdif.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/sound/soc/tegra/tegra20_spdif.c b/sound/soc/tegra/tegra20_spdif.c index 57a6c576b91f..e45e371edc42 100644 --- a/sound/soc/tegra/tegra20_spdif.c +++ b/sound/soc/tegra/tegra20_spdif.c @@ -69,6 +69,14 @@ static int tegra20_spdif_hw_params(struct snd_pcm_substream *substream, regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL, mask, val); + /* + * FIFO trigger level must be bigger than DMA burst or equal to it, + * otherwise data is discarded on overflow. + */ + regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_DATA_FIFO_CSR, + TEGRA20_SPDIF_DATA_FIFO_CSR_TX_ATN_LVL_MASK, + TEGRA20_SPDIF_DATA_FIFO_CSR_TX_ATN_LVL_TU4_WORD_FULL); + switch (params_rate(params)) { case 32000: spdifclock = 4096000; -- 2.20.1