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spi: imx: use PIO mode if size is small

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Use PIO mode instead if size is smaller than fifo size, since
dma may be less efficient.

Signed-off-by: Robin Gong <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
This commit is contained in:
Robin Gong 2018-10-10 10:32:48 +00:00 • committed by Mark Brown
commit 133eb8e38b
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3
drivers/spi/spi-imx.c
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@ -224,6 +224,9 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
if (spi_imx->slave_mode)
return false;
if (transfer->len < spi_imx->devtype_data->fifo_size)
return false;
spi_imx->dynamic_burst = 0;
return true;