diff options
Diffstat (limited to 'drivers/serial/bfin_sport_uart.c')
| -rw-r--r-- | drivers/serial/bfin_sport_uart.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/serial/bfin_sport_uart.c b/drivers/serial/bfin_sport_uart.c index 5318dd3774a..e95c524d9d1 100644 --- a/drivers/serial/bfin_sport_uart.c +++ b/drivers/serial/bfin_sport_uart.c @@ -10,7 +10,7 @@ /* * This driver and the hardware supported are in term of EE-191 of ADI. - * http://www.analog.com/UploadedFiles/Application_Notes/399447663EE191.pdf + * http://www.analog.com/static/imported-files/application_notes/EE191.pdf * This application note describe how to implement a UART on a Sharc DSP, * but this driver is implemented on Blackfin Processor. * Transmit Frame Sync is not used by this driver to transfer data out. @@ -131,7 +131,12 @@ static int sport_uart_setup(struct sport_uart_port *up, int size, int baud_rate) pr_debug("%s RCR1:%x, RCR2:%x\n", __func__, SPORT_GET_RCR1(up), SPORT_GET_RCR2(up)); tclkdiv = sclk / (2 * baud_rate) - 1; - rclkdiv = sclk / (2 * baud_rate * 2) - 1; + /* The actual uart baud rate of devices vary between +/-2%. The sport + * RX sample rate should be faster than the double of the worst case, + * otherwise, wrong data are received. So, set sport RX clock to be + * 3% faster. + */ + rclkdiv = sclk / (2 * baud_rate * 2 * 97 / 100) - 1; SPORT_PUT_TCLKDIV(up, tclkdiv); SPORT_PUT_RCLKDIV(up, rclkdiv); SSYNC(); |