The reference manual says that pm has to stay within 2 and 32. So the lowest frequency is 32 and DIV16 set, the highest is 2 and DIV16 unset.
Signed-off-by: Sebastian Andrzej Siewior <[email protected]> --- drivers/spi/spi-fsl-espi.c | 10 ++++++---- 1 files changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c index 43350f9..7523a24 100644 --- a/drivers/spi/spi-fsl-espi.c +++ b/drivers/spi/spi-fsl-espi.c @@ -182,16 +182,18 @@ static int fsl_espi_setup_transfer(struct spi_device *spi, cs->hw_mode |= CSMODE_DIV16; pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4); - WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. " + WARN_ONCE(pm > 33, "%s: Requested speed is too low: %d Hz. " "Will use %d Hz instead.\n", dev_name(&spi->dev), - hz, mpc8xxx_spi->spibrg / 1024); - if (pm > 16) - pm = 16; + hz, mpc8xxx_spi->spibrg / (4 * 16 * (32 + 1))); + if (pm > 33) + pm = 33; } else { pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4); } if (pm) pm--; + if (pm < 2) + pm = 2; cs->hw_mode |= CSMODE_PM(pm); -- 1.7.9.1 ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
