Re: [U-Boot-Users] [PATCH/review] Blackfin: make baud calculation more accurate

In message 1207721182-29697-1-git-send-email-vapier@gentoo.org you wrote:

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

^^^^^^^^^^^^^^^^^^^

Fix!

* rather than under sample the incoming signals.
*/

• uint16_t divisor = (get_sclk() / (baud * 16)) + 1;

• uint16_t divisor = (get_sclk() + (baud * 8)) / (baud * 16);

Please make sure to adjust the comment, as there is no "+1" any more in the new code.

Best regards,

Wolfgang Denk