diff options
| -rw-r--r-- | drivers/spi/spi-fsl-espi.c | 28 |
1 files changed, 12 insertions, 16 deletions
diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c index 1d3c9023391d..8b3a28739d9a 100644 --- a/drivers/spi/spi-fsl-espi.c +++ b/drivers/spi/spi-fsl-espi.c @@ -247,8 +247,7 @@ static void fsl_espi_setup_transfer(struct spi_device *spi, { struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); int bits_per_word = t ? t->bits_per_word : spi->bits_per_word; - u32 hz = t ? t->speed_hz : spi->max_speed_hz; - u8 pm; + u32 pm, hz = t ? t->speed_hz : spi->max_speed_hz; struct spi_mpc8xxx_cs *cs = spi->controller_state; /* mask out bits we are going to set */ @@ -256,22 +255,19 @@ static void fsl_espi_setup_transfer(struct spi_device *spi, cs->hw_mode |= CSMODE_LEN(bits_per_word - 1); - if ((mpc8xxx_spi->spibrg / hz) > 64) { + pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4) - 1; + + if (pm > 15) { cs->hw_mode |= CSMODE_DIV16; - pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4); - - 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 / (4 * 16 * (32 + 1))); - if (pm > 33) - pm = 33; - } else { - pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4); + pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4) - 1; + + WARN_ONCE(pm > 15, + "%s: Requested speed is too low: %u Hz. Will use %u Hz instead.\n", + dev_name(&spi->dev), hz, + mpc8xxx_spi->spibrg / (4 * 16 * (15 + 1))); + if (pm > 15) + pm = 15; } - if (pm) - pm--; - if (pm < 2) - pm = 2; cs->hw_mode |= CSMODE_PM(pm); |