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spi: dw-dma: Get the last DMA scoop out of the FIFO #5699

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merged 1 commit into from
Nov 7, 2023
Merged

spi: dw-dma: Get the last DMA scoop out of the FIFO #5699

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6 changes: 5 additions & 1 deletion drivers/spi/spi-dw-dma.c
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Original file line number Diff line number Diff line change
Expand Up @@ -275,8 +275,10 @@ static void dw_spi_dma_tx_done(void *arg)
struct dw_spi *dws = arg;

clear_bit(DW_SPI_TX_BUSY, &dws->dma_chan_busy);
if (test_bit(DW_SPI_RX_BUSY, &dws->dma_chan_busy))
if (test_bit(DW_SPI_RX_BUSY, &dws->dma_chan_busy)) {
dw_writel(dws, DW_SPI_DMARDLR, 0);
return;
}

complete(&dws->dma_completion);
}
Expand Down Expand Up @@ -602,6 +604,8 @@ static int dw_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer)

nents = max(xfer->tx_sg.nents, xfer->rx_sg.nents);

dw_writel(dws, DW_SPI_DMARDLR, xfer->tx_buf ? (dws->rxburst - 1) : 0);

/*
* Execute normal DMA-based transfer (which submits the Rx and Tx SG
* lists directly to the DMA engine at once) if either full hardware
Expand Down