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Subject[PATCH 48/49] serial: bfin_sport_uart: speed up sport RX sample rate to be 3% faster
Date
From: Sonic Zhang <sonic.zhang@analog.com>

The actual uart baud rate of devices vary between +/-2% of what is
asked. The SPORT RX sample rate should be faster than double of the
worst case. Otherwise, wrong data may be received. So set SPORT RX
clock to be 3% faster in general.

Reported-by: Olivier STOCK <ostockemer@ereca.fr>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/serial/bfin_sport_uart.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/bfin_sport_uart.c b/drivers/serial/bfin_sport_uart.c
index 5318dd3..6f1b51e 100644
--- a/drivers/serial/bfin_sport_uart.c
+++ b/drivers/serial/bfin_sport_uart.c
@@ -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();
--
1.7.2


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