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mpfs/mpfs_corespi.c: Round up divider to prevent overlock of SPI #188

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Nov 29, 2023
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mpfs/mpfs_corespi.c: Round up divider to prevent overlock of SPI #188

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4 changes: 2 additions & 2 deletions arch/risc-v/src/mpfs/mpfs_corespi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -542,9 +542,9 @@ static uint32_t mpfs_spi_setfrequency(struct spi_dev_s *dev,

priv->frequency = frequency;

/* Formula is SPICLK = PCLK/(2*(CFG_CLK + 1)) */
/* Formula is SPICLK = PCLK/(2*(CFG_CLK + 1)) (result is rounded up) */

divider = ((MPFS_FPGA_PERIPHERAL_CLK / frequency) >> 1) - 1;
divider = (MPFS_FPGA_PERIPHERAL_CLK / frequency) >> 1;
priv->actual = MPFS_FPGA_PERIPHERAL_CLK / ((divider + 1) << 1);

DEBUGASSERT(divider < 256u);
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