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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>
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1 changed files with 2 additions and 2 deletions
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@ -71,7 +71,7 @@ static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
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/**************************************************************/
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#define HW_BUF_SPD_THRESHOLD 9600
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#define HW_BUF_SPD_THRESHOLD 2400
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/*
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* Check, if transmit buffers are processed
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@ -505,7 +505,7 @@ static void cpm_uart_set_termios(struct uart_port *port,
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pr_debug("CPM uart[%d]:set_termios\n", port->line);
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baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
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if (baud <= HW_BUF_SPD_THRESHOLD ||
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if (baud < HW_BUF_SPD_THRESHOLD ||
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(pinfo->port.state && pinfo->port.state->port.tty->low_latency))
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pinfo->rx_fifosize = 1;
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else
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