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spi: fsl-lpspi: read lpspi tx/rx fifo size in probe()

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The lpspi tx/rx fifo size is a read only parameter resides
lpspi Parameter Register. It's better to read lpspi tx/rx
fifo size in probe().

Signed-off-by: Gao Pan <pandy.gao@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gao Pan 2016-11-28 11:03:00 +08:00 committed by Mark Brown
parent d2ad0a62d4
commit b88a0deaaf
1 changed files with 14 additions and 7 deletions
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21
drivers/spi/spi-fsl-lpspi.c
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@ -236,15 +236,9 @@ static void fsl_lpspi_set_cmd(struct fsl_lpspi_data *fsl_lpspi,
static void fsl_lpspi_set_watermark(struct fsl_lpspi_data *fsl_lpspi)
{
u8 txwatermark, rxwatermark;
u32 temp;
temp = readl(fsl_lpspi->base + IMX7ULP_PARAM);
fsl_lpspi->txfifosize = 1 << (temp & 0x0f);
fsl_lpspi->rxfifosize = 1 << ((temp >> 8) & 0x0f);
rxwatermark = fsl_lpspi->txfifosize >> 1;
txwatermark = fsl_lpspi->rxfifosize >> 1;
temp = txwatermark | rxwatermark << 16;
temp = fsl_lpspi->txfifosize >> 1 | (fsl_lpspi->rxfifosize >> 1) << 16;
writel(temp, fsl_lpspi->base + IMX7ULP_FCR);
@ -427,6 +421,7 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
struct spi_master *master;
struct resource *res;
int ret, irq;
u32 temp;
master = spi_alloc_master(&pdev->dev, sizeof(struct fsl_lpspi_data));
if (!master)
@ -476,6 +471,18 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
goto out_master_put;
}
ret = clk_prepare_enable(fsl_lpspi->clk);
if (ret) {
dev_err(&pdev->dev, "can't enable lpspi clock, ret=%d\n", ret);
goto out_master_put;
}
temp = readl(fsl_lpspi->base + IMX7ULP_PARAM);
fsl_lpspi->txfifosize = 1 << (temp & 0x0f);
fsl_lpspi->rxfifosize = 1 << ((temp >> 8) & 0x0f);
clk_disable_unprepare(fsl_lpspi->clk);
ret = devm_spi_register_master(&pdev->dev, master);
if (ret < 0) {
dev_err(&pdev->dev, "spi_register_master error.\n");