From cd4df8f82b77e2599a65b81cfa06f3bc58399e15 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Mon, 31 Aug 2015 16:55:52 +0200 Subject: spi: i.MX: use start mode control bit 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 --- drivers/spi/imx_spi.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/imx_spi.c b/drivers/spi/imx_spi.c index 6805d22a75..81fa3b02ab 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) -- cgit v1.2.3