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| author | David Engraf <david.engraf@sysgo.com> | 2019-12-11 17:29:54 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-12 12:04:00 +0100 |
| commit | 751d0017334db9c4d68a8909c59f662a6ecbcec6 (patch) | |
| tree | 1779bc37663eb239dde4ab01548ed47e6c706d3a /drivers/tty/serial/atmel_serial.c | |
| parent | 2301ec36cec8cd8199b608651a806441ab70331b (diff) | |
| download | linux-stable-751d0017334db9c4d68a8909c59f662a6ecbcec6.tar.gz linux-stable-751d0017334db9c4d68a8909c59f662a6ecbcec6.tar.bz2 linux-stable-751d0017334db9c4d68a8909c59f662a6ecbcec6.zip | |
tty/serial: atmel: fix out of range clock divider handling
Use MCK_DIV8 when the clock divider is > 65535. Unfortunately the mode
register was already written thus the clock selection is ignored.
Fix by writing the mode register after calculating the baudrate.
Signed-off-by: David Engraf <david.engraf@sysgo.com>
Link: https://lore.kernel.org/r/20191211162954.8393-1-david.engraf@sysgo.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/atmel_serial.c')
| -rw-r--r-- | drivers/tty/serial/atmel_serial.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index a8dc8af83f39..9983e2fabbac 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -2270,9 +2270,6 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, mode |= ATMEL_US_USMODE_NORMAL; } - /* set the mode, clock divisor, parity, stop bits and data size */ - atmel_uart_writel(port, ATMEL_US_MR, mode); - /* * when switching the mode, set the RTS line state according to the * new mode, otherwise keep the former state @@ -2315,6 +2312,9 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, } quot = cd | fp << ATMEL_US_FP_OFFSET; + /* set the mode, clock divisor, parity, stop bits and data size */ + atmel_uart_writel(port, ATMEL_US_MR, mode); + if (!(port->iso7816.flags & SER_ISO7816_ENABLED)) atmel_uart_writel(port, ATMEL_US_BRGR, quot); atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); |