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| author | Stefan Wahren <wahrenst@gmx.net> | 2025-08-07 13:07:42 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2025-08-07 16:46:32 +0300 |
| commit | af357a6a3b7d685e7aa621c6fb1d4ed6c349ec9e (patch) | |
| tree | 7cfc1ec6397c481f76dca885163a462cdc86894f /drivers/spi/spi-fsl-lpspi.c | |
| parent | a4f8e70d75dd11ab1a01894893e0b03f1d0b61fd (diff) | |
| download | linux-af357a6a3b7d685e7aa621c6fb1d4ed6c349ec9e.tar.xz | |
spi: spi-fsl-lpspi: Clamp too high speed_hz
Currently the driver is not able to handle the case that a SPI device
specifies a higher spi-max-frequency than half of per-clk:
per-clk should be at least two times of transfer speed
Fix this by clamping to the max possible value and use the minimum SCK
period of 2 cycles.
Fixes: 77736a98b859 ("spi: lpspi: add the error info of transfer speed setting")
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Link: https://patch.msgid.link/20250807100742.9917-1-wahrenst@gmx.net
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-fsl-lpspi.c')
| -rw-r--r-- | drivers/spi/spi-fsl-lpspi.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c index 67d4000c3cef..313e444a34f3 100644 --- a/drivers/spi/spi-fsl-lpspi.c +++ b/drivers/spi/spi-fsl-lpspi.c @@ -330,13 +330,11 @@ static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data *fsl_lpspi) } if (config.speed_hz > perclk_rate / 2) { - dev_err(fsl_lpspi->dev, - "per-clk should be at least two times of transfer speed"); - return -EINVAL; + div = 2; + } else { + div = DIV_ROUND_UP(perclk_rate, config.speed_hz); } - div = DIV_ROUND_UP(perclk_rate, config.speed_hz); - for (prescale = 0; prescale <= prescale_max; prescale++) { scldiv = div / (1 << prescale) - 2; if (scldiv >= 0 && scldiv < 256) { |