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[PATCH] Altix ioc4 serial - set a better timeout/threshold
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>
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1 changed files with 7 additions and 4 deletions
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@ -1272,8 +1272,9 @@ static inline int set_rx_timeout(struct ioc4_port *port, int timeout)
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* and set the rx threshold to that amount. There are 4 chars
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* per ring entry, so we'll divide the number of chars that will
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* arrive in timeout by 4.
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* So .... timeout * baud / 10 / HZ / 4, with HZ = 100.
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*/
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threshold = timeout * port->ip_baud / 10 / HZ / 4;
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threshold = timeout * port->ip_baud / 4000;
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if (threshold == 0)
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threshold = 1; /* otherwise we'll intr all the time! */
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@ -1285,8 +1286,10 @@ static inline int set_rx_timeout(struct ioc4_port *port, int timeout)
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writel(port->ip_sscr, &port->ip_serial_regs->sscr);
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/* Now set the rx timeout to the given value */
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timeout = timeout * IOC4_SRTR_HZ / HZ;
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/* Now set the rx timeout to the given value
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* again timeout * IOC4_SRTR_HZ / HZ
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*/
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timeout = timeout * IOC4_SRTR_HZ / 100;
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if (timeout > IOC4_SRTR_CNT)
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timeout = IOC4_SRTR_CNT;
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@ -1380,7 +1383,7 @@ config_port(struct ioc4_port *port,
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if (port->ip_tx_lowat == 0)
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port->ip_tx_lowat = 1;
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set_rx_timeout(port, port->ip_rx_timeout);
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set_rx_timeout(port, 2);
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return 0;
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}
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