Blackfin: bfin_spi: round up clock divider
If the requested clock cannot be exactly obtained, round it up so that we err on the side of slightly slower rather than slightly faster. Signed-off-by: Cliff Cai <cliff.cai@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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@ -85,6 +85,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
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unsigned int max_hz, unsigned int mode)
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unsigned int max_hz, unsigned int mode)
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{
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{
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struct bfin_spi_slave *bss;
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struct bfin_spi_slave *bss;
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ulong sclk;
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u32 mmr_base;
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u32 mmr_base;
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u32 baud;
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u32 baud;
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@ -105,7 +106,11 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
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default: return NULL;
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default: return NULL;
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}
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}
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baud = get_sclk() / (2 * max_hz);
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sclk = get_sclk();
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baud = sclk / (2 * max_hz);
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/* baud should be rounded up */
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if (sclk % (2 * max_hz))
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baud += 1;
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if (baud < 2)
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if (baud < 2)
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baud = 2;
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baud = 2;
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else if (baud > (u16)-1)
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else if (baud > (u16)-1)
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