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Subject[PATCH 2.6.12 2/2] Altix ioc4 serial - set a better timeout/threshold

Set the timeout and threshold to better values.


Signed-off-by: Patrick Gefre <pfg@sgi.com>




Index: linux-2.5-ioc4/drivers/serial/ioc4_serial.c
===================================================================
--- linux-2.5-ioc4.orig/drivers/serial/ioc4_serial.c 2005-03-24 13:56:48.230417236 -0600
+++ linux-2.5-ioc4/drivers/serial/ioc4_serial.c 2005-03-24 13:58:35.560294893 -0600
@@ -1272,8 +1272,9 @@
* 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
* 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)
threshold = 1; /* otherwise we'll intr all the time! */

@@ -1285,8 +1286,10 @@

writel(port->ip_sscr, &port->ip_serial_regs->sscr);

- /* Now set the rx timeout to the given value */
- timeout = timeout * IOC4_SRTR_HZ / HZ;
+ /* Now set the rx timeout to the given value
+ * again timeout * IOC4_SRTR_HZ / HZ
+ */
+ timeout = timeout * IOC4_SRTR_HZ / 100;
if (timeout > IOC4_SRTR_CNT)
timeout = IOC4_SRTR_CNT;

@@ -1380,7 +1383,7 @@
if (port->ip_tx_lowat == 0)
port->ip_tx_lowat = 1;

- set_rx_timeout(port, port->ip_rx_timeout);
+ set_rx_timeout(port, 2);

return 0;
}
--

-
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