The i.MX SPI controller in version 2.3 can immediately start a transfer
when the txfifo is written to. In this mode we no longer have to trigger
the transfer with the xch bit which makes the code a bit simpler.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/spi/imx_spi.c | 8 ++------
include/spi/imx-spi.h | 1 +
2 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/spi/imx_spi.c b/drivers/spi/imx_spi.c
index 6805d22..81fa3b0 100644
--- a/drivers/spi/imx_spi.c
+++ b/drivers/spi/imx_spi.c
@@ -230,14 +230,8 @@ static unsigned int cspi_2_3_xchg_single(struct imx_spi *imx, unsigned int data)
{
void __iomem *base = imx->regs;
- unsigned int cfg_reg = readl(base + CSPI_2_3_CTRL);
-
writel(data, base + CSPI_2_3_TXDATA);
- cfg_reg |= CSPI_2_3_CTRL_XCH;
-
- writel(cfg_reg, base + CSPI_2_3_CTRL);
-
while (!(readl(base + CSPI_2_3_STAT) & CSPI_2_3_STAT_RR));
return readl(base + CSPI_2_3_RXDATA);
@@ -306,6 +300,8 @@ static void cspi_2_3_chipselect(struct spi_device *spi, int is_active)
ctrl |= (spi->bits_per_word - 1) << CSPI_2_3_CTRL_BL_OFFSET;
+ ctrl |= CSPI_2_3_CTRL_SMC;
+
cfg |= CSPI_2_3_CONFIG_SBBCTRL(cs);
if (spi->mode & SPI_CPHA)
diff --git a/include/spi/imx-spi.h b/include/spi/imx-spi.h
index 560b092..5c89634 100644
--- a/include/spi/imx-spi.h
+++ b/include/spi/imx-spi.h
@@ -61,6 +61,7 @@
#define CSPI_2_3_CTRL 0x08
#define CSPI_2_3_CTRL_ENABLE (1 << 0)
#define CSPI_2_3_CTRL_XCH (1 << 2)
+#define CSPI_2_3_CTRL_SMC (1 << 3)
#define CSPI_2_3_CTRL_MODE(cs) (1 << ((cs) + 4))
#define CSPI_2_3_CTRL_POSTDIV_OFFSET 8
#define CSPI_2_3_CTRL_PREDIV_OFFSET 12
--
2.5.0
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