diff options
Diffstat (limited to 'drivers/spi/spi-sunxi.c')
| -rw-r--r-- | drivers/spi/spi-sunxi.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/spi/spi-sunxi.c b/drivers/spi/spi-sunxi.c index 5d7ca5be2bb..628294948b5 100644 --- a/drivers/spi/spi-sunxi.c +++ b/drivers/spi/spi-sunxi.c @@ -72,7 +72,9 @@ DECLARE_GLOBAL_DATA_PTR; #define SUN4I_XMIT_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE) #define SUN4I_FIFO_STA_RF_CNT_BITS 0 -#define SUN4I_SPI_MAX_RATE 24000000 +/* the SPI mod clock, defaulting to be 1/1 of the HOSC@24MHz */ +#define SUNXI_INPUT_CLOCK 24000000 /* 24 MHz */ +#define SUN4I_SPI_MAX_RATE SUNXI_INPUT_CLOCK #define SUN4I_SPI_MIN_RATE 3000 #define SUN4I_SPI_DEFAULT_RATE 1000000 #define SUN4I_SPI_TIMEOUT_MS 1000 @@ -242,17 +244,18 @@ static void sun4i_spi_set_speed_mode(struct udevice *dev) * frequency, fall back to CDR1. */ - div = SUN4I_SPI_MAX_RATE / (2 * priv->freq); + div = DIV_ROUND_UP(SUNXI_INPUT_CLOCK, priv->freq); reg = readl(SPI_REG(priv, SPI_CCR)); - if (div <= (SUN4I_CLK_CTL_CDR2_MASK + 1)) { + if ((div / 2) <= (SUN4I_CLK_CTL_CDR2_MASK + 1)) { + div /= 2; if (div > 0) div--; reg &= ~(SUN4I_CLK_CTL_CDR2_MASK | SUN4I_CLK_CTL_DRS); reg |= SUN4I_CLK_CTL_CDR2(div) | SUN4I_CLK_CTL_DRS; } else { - div = __ilog2(SUN4I_SPI_MAX_RATE) - __ilog2(priv->freq); + div = fls(div - 1); reg &= ~((SUN4I_CLK_CTL_CDR1_MASK << 8) | SUN4I_CLK_CTL_DRS); reg |= SUN4I_CLK_CTL_CDR1(div); } |