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 410522f..3aa33c8 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -356,6 +356,9 @@
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 @@
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);
/*