Commit 16736a02 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Mark Brown

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: default avatarDmitry Osipenko <digetx@gmail.com>
Acked-by: default avatarThierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20211204143725.31646-6-digetx@gmail.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
parent 549818e5
......@@ -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;
......
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