linux-kernel - [PATCH v1 3/3] spi: imx: use PIO mode if size is small

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Date:   Wed, 10 Oct 2018 10:32:48 +0000
From:   Robin Gong <yibin.gong@....com>
To:     "broonie@...nel.org" <broonie@...nel.org>
CC:     "maxime.chevallier@...tlin.com" <maxime.chevallier@...tlin.com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: [PATCH v1 3/3] 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 <yibin.gong@....com>
---
 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 037abbb..dd1ce12 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;
-- 
2.7.4