From 133eb8e38b02c6c63a039523fca12737009a6686 Mon Sep 17 00:00:00 2001 From: Robin Gong Date: Wed, 10 Oct 2018 10:32:48 +0000 Subject: [PATCH] spi: imx: use PIO mode if size is small Use PIO mode instead if size is smaller than fifo size, since dma may be less efficient. Signed-off-by: Robin Gong Signed-off-by: Mark Brown --- drivers/spi/spi-imx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 037abbb852a4..dd1ce12aa386 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -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; -- 2.39.5