diff options
| author | Cliff Cai <cliff.cai@analog.com> | 2009-12-07 08:03:06 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2010-01-17 09:17:27 -0500 |
| commit | 581d92eefc1a060ea5c6eb42028880a37095953d (patch) | |
| tree | 918445f57f9b6baeb4ee9469897cde6acdf7751a | |
| parent | a52ad4f99486ce3f404f83f75263e321956bb6d5 (diff) | |
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>
| -rw-r--r-- | drivers/spi/bfin_spi.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/spi/bfin_spi.c b/drivers/spi/bfin_spi.c index 093166efed..f28d42b489 100644 --- a/drivers/spi/bfin_spi.c +++ b/drivers/spi/bfin_spi.c @@ -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) |