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spi: dw: Wait for idle after TX

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If this is a DMA transfer, and if there is no simultaneous RX transfer,
wait for the interface to go idle before reporting that TX is done.

Link: https://forums.raspberrypi.com/viewtopic.php?t=383027

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2025-02-03 17:50:20 +00:00
committed by Dom Cobley
parent 6589657fbd
commit 640e91c7c5
1 changed files with 6 additions and 0 deletions
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6
drivers/spi/spi-dw-dma.c
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@@ -304,6 +304,12 @@ static int dw_spi_dma_wait_tx_done(struct dw_spi *dws,
return -EIO;
}
if (!xfer->rx_buf) {
delay.value = dws->n_bytes * BITS_PER_BYTE;
while (dw_readl(dws, DW_SPI_SR) & DW_SPI_SR_BUSY)
spi_delay_exec(&delay, xfer);
}
return 0;
}