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spi: imx: fix loopback mode setup after controller reset

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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>
This commit is contained in:
Anton Bondarenko 2015-12-08 07:43:43 +01:00 • committed by Mark Brown
parent f8a876176f
commit f677f17cce
1 changed files with 3 additions and 1 deletions
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4
drivers/spi/spi-imx.c
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@ -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);
/*