[PATCH v6 1/8] spi: imx: fix loopback mode setup after controller reset

2015-12-07 Thread Anton Bondarenko 
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 
---
 drivers/spi/spi-imx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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 @@ 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);
 
/*
-- 
2.6.3

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[PATCH v6 1/8] spi: imx: fix loopback mode setup after controller reset

2015-12-07 Thread Anton Bondarenko 
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 
---
 drivers/spi/spi-imx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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 @@ 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);
 
/*
-- 
2.6.3

--
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Please read the FAQ at  http://www.tux.org/lkml/