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Blackfin: make baud calculation more accurate

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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>
This commit is contained in:
Mike Frysinger 2008-04-20 03:11:53 -04:00
parent 0ba1da116e
commit 25cd33d82e
1 changed files with 4 additions and 4 deletions
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8
cpu/blackfin/serial.h
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@ -175,11 +175,11 @@ static inline uint32_t serial_early_get_baud(void)
__attribute__((always_inline))
static inline void serial_early_set_baud(uint32_t baud)
{
/* Translate from baud into divisor in terms of SCLK.
* The +1 is to make sure we over sample just a little
* rather than under sample the incoming signals.
/* Translate from baud into divisor in terms of SCLK. The
* weird multiplication 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) - ANOMALY_05000230;
/* Set DLAB in LCR to Access DLL and DLH */
ACCESS_LATCH();