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drivers: dai: sai: write some data into TX FIFO before start #72791

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May 17, 2024
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drivers: dai: sai: write some data into TX FIFO before start #72791

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9 changes: 7 additions & 2 deletions drivers/dai/nxp/sai/sai.c
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Original file line number Diff line number Diff line change
Expand Up @@ -696,7 +696,7 @@ static int sai_trigger_start(const struct device *dev,
struct sai_data *data;
const struct sai_config *cfg;
uint32_t old_state;
int ret;
int ret, i;

data = dev->data;
cfg = dev->config;
Expand Down Expand Up @@ -733,7 +733,12 @@ static int sai_trigger_start(const struct device *dev,
SAI_TX_RX_ENABLE_DISABLE_IRQ(dir, data->regmap,
kSAI_FIFOErrorInterruptEnable, true);

/* TODO: is there a need to write some words to the FIFO to avoid starvation? */
/* avoid initial underrun by writing a frame's worth of 0s */
if (dir == DAI_DIR_TX) {
for (i = 0; i < data->cfg.channels; i++) {
SAI_WriteData(UINT_TO_I2S(data->regmap), cfg->tx_dline, 0x0);
}
}

/* TODO: for now, only DMA mode is supported */
SAI_TX_RX_DMA_ENABLE_DISABLE(dir, data->regmap, true);
Expand Down
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