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[PATCH] Altix ioc4 serial - set a better timeout/threshold

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Set the timeout and threshold to better values.

Signed-off-by: Patrick Gefre <pfg@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Patrick Gefre 2005-05-01 08:59:21 -07:00 committed by Linus Torvalds
parent 149733d4e2
commit 6cb2875f8d
1 changed files with 7 additions and 4 deletions
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11
drivers/serial/ioc4_serial.c
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@ -1272,8 +1272,9 @@ static inline int set_rx_timeout(struct ioc4_port *port, int timeout)
* and set the rx threshold to that amount. There are 4 chars * and set the rx threshold to that amount. There are 4 chars
* per ring entry, so we'll divide the number of chars that will * per ring entry, so we'll divide the number of chars that will
* arrive in timeout by 4. * arrive in timeout by 4.
* So .... timeout * baud / 10 / HZ / 4, with HZ = 100.
*/ */
threshold = timeout * port->ip_baud / 10 / HZ / 4; threshold = timeout * port->ip_baud / 4000;
if (threshold == 0) if (threshold == 0)
threshold = 1; /* otherwise we'll intr all the time! */ threshold = 1; /* otherwise we'll intr all the time! */
@ -1285,8 +1286,10 @@ static inline int set_rx_timeout(struct ioc4_port *port, int timeout)
writel(port->ip_sscr, &port->ip_serial_regs->sscr); writel(port->ip_sscr, &port->ip_serial_regs->sscr);
/* Now set the rx timeout to the given value */ /* Now set the rx timeout to the given value
timeout = timeout * IOC4_SRTR_HZ / HZ; * again timeout * IOC4_SRTR_HZ / HZ
*/
timeout = timeout * IOC4_SRTR_HZ / 100;
if (timeout > IOC4_SRTR_CNT) if (timeout > IOC4_SRTR_CNT)
timeout = IOC4_SRTR_CNT; timeout = IOC4_SRTR_CNT;
@ -1380,7 +1383,7 @@ config_port(struct ioc4_port *port,
if (port->ip_tx_lowat == 0) if (port->ip_tx_lowat == 0)
port->ip_tx_lowat = 1; port->ip_tx_lowat = 1;
set_rx_timeout(port, port->ip_rx_timeout); set_rx_timeout(port, 2);
return 0; return 0;
} }