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| author | Anton Bondarenko <anton.bondarenko.sama@gmail.com> | 2015-12-08 09:43:43 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-12-16 01:40:35 +0300 |
| commit | f677f17cced0ca72a4331b64de119b35b19facb0 (patch) | |
| tree | ac0e01ce3f039692e8bf9c8ff4a1e9ff104eb2d2 /drivers/spi | |
| parent | f8a876176f38e00aab200d308506ca4a4ba57b39 (diff) | |
| download | linux-f677f17cced0ca72a4331b64de119b35b19facb0.tar.xz | |
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-imx.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 410522fdd4c9..3aa33c8c819f 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); /* |