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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>
This commit is contained in:
Cliff Cai 2009-12-07 08:03:06 +00:00 committed by Mike Frysinger
parent a52ad4f994
commit 581d92eefc
1 changed files with 6 additions and 1 deletions
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7
drivers/spi/bfin_spi.c
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@ -85,6 +85,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct bfin_spi_slave *bss;
ulong sclk;
u32 mmr_base;
u32 baud;
@ -105,7 +106,11 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
default: return NULL;
}
baud = get_sclk() / (2 * max_hz);
sclk = get_sclk();
baud = sclk / (2 * max_hz);
/* baud should be rounded up */
if (sclk % (2 * max_hz))
baud += 1;
if (baud < 2)
baud = 2;
else if (baud > (u16)-1)