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

[Mike Frysinger]

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 at 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();
-- 
1.5.4.4