Re: [PATCH 2/6] IP100A Fix Tx pause bug

From: Jesse Huang
Date: Mon Aug 21 2006 - 21:17:53 EST

----- Original Message -----
From: "Jeff Garzik" <jgarzik@xxxxxxxxx>
To: "Jesse Huang" <jesse@xxxxxxxxxxxxx>
Cc: <linux-kernel@xxxxxxxxxxxxxxx>; <netdev@xxxxxxxxxxxxxxx>;
Sent: Friday, August 18, 2006 7:27 PM
Subject: Re: [PATCH 2/6] IP100A Fix Tx pause bug

>> + iowrite8(127, ioaddr + TxDMAPollPeriod);
>> +
> what does the value 127 represent?

127 is polling period of Tx DMA to watch if there any packet need to send.
The 127 means 127*320ns.

> DownCounter should not be written unconditionally. Consider shared
> interrupts, where sundance performs no work, and handled==0.

DownCount is a the register that we can use for timer interrupt. When the
value of DownCount from 1 count down to 0 , IP100A will issue an interrupt.

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