From: Cliff Cai cliff.cai@analog.com
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 --- 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 093166e..f28d42b 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)