diff options
| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2012-09-24 08:19:03 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-09-26 13:39:39 -0700 |
| commit | 59733ef7e510f6fd51a3dfc6f22ec1d3630a47b9 (patch) | |
| tree | fe2fdf1f4e631217bdaf8e63c5d623e0db704440 /drivers/tty | |
| parent | Powerpc 8xx CPM_UART desynchronisation (diff) | |
| download | linux-dev-59733ef7e510f6fd51a3dfc6f22ec1d3630a47b9.tar.xz linux-dev-59733ef7e510f6fd51a3dfc6f22ec1d3630a47b9.zip | |
Powerpc 8xx CPM_UART too many interrupts
Setting the fifo to only 1 byte generates one interrupt every 1ms at 9600 bauds.
This is too much. This patch reduces the threshold to speeds below 2400 bauds
like in the 8250 UART driver.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/cpm_uart/cpm_uart_core.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c index 46af6e47f061..46edc649b0b7 100644 --- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c +++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c @@ -71,7 +71,7 @@ static void cpm_uart_initbd(struct uart_cpm_port *pinfo); /**************************************************************/ -#define HW_BUF_SPD_THRESHOLD 9600 +#define HW_BUF_SPD_THRESHOLD 2400 /* * Check, if transmit buffers are processed @@ -505,7 +505,7 @@ static void cpm_uart_set_termios(struct uart_port *port, pr_debug("CPM uart[%d]:set_termios\n", port->line); baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); - if (baud <= HW_BUF_SPD_THRESHOLD || + if (baud < HW_BUF_SPD_THRESHOLD || (pinfo->port.state && pinfo->port.state->port.tty->low_latency)) pinfo->rx_fifosize = 1; else |