We should use the algorithm in the Linux kernel so that the UART divisor calculation is more accurate. It also fixes problems on some picky UARTs that have sampling anomalies.
Signed-off-by: Mike Frysinger vapier@gentoo.org --- cpu/blackfin/serial.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/cpu/blackfin/serial.h b/cpu/blackfin/serial.h index 1f0f4b4..d268da5 100644 --- a/cpu/blackfin/serial.h +++ b/cpu/blackfin/serial.h @@ -179,7 +179,7 @@ static inline void serial_early_set_baud(uint32_t baud) * The +1 is to make sure we over sample just a little * rather than under sample the incoming signals. */ - uint16_t divisor = (get_sclk() / (baud * 16)) + 1; + uint16_t divisor = (get_sclk() + (baud * 8)) / (baud * 16);
/* Set DLAB in LCR to Access DLL and DLH */ ACCESS_LATCH();