spi: imx: fix loopback mode setup after controller reset

If controller hold in reset it's not possible to write any
register except CTRL. So all other registers must be updated
only after controller bring out from reset.

Signed-off-by: Anton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 410522fdd4c91e55e902d8add6adaab274e3cdea..3aa33c8c819f478eb66b89438bd1020d192de8bd 100644 (file)
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -356,6 +356,9 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
        else
                cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(config->cs);
 
+       /* CTRL register always go first to bring out controller from reset */
+       writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
+
        reg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
        if (config->mode & SPI_LOOP)
                reg |= MX51_ECSPI_TESTREG_LBC;
@@ -363,7 +366,6 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
                reg &= ~MX51_ECSPI_TESTREG_LBC;
        writel(reg, spi_imx->base + MX51_ECSPI_TESTREG);
 
-       writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
        writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
 
        /*