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Commit 59733ef7 authored by Christophe Leroy's avatar Christophe Leroy Committed by Greg Kroah-Hartman
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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: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Acked-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 725ef4a3

drivers/tty/serial/cpm_uart/cpm_uart_core.c

+2 −2
Original line number Diff line number Diff line
@@ -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