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

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Message-ID: <00bd01c6c588$afdedbc0$4964a8c0@icplus.com.tw>
Date:	Tue, 22 Aug 2006 09:17:08 +0800
From:	"Jesse Huang" <jesse@...lus.com.tw>
To:	"Jeff Garzik" <jgarzik@...ox.com>
Cc:	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	<akpm@...l.org>
Subject: Re: [PATCH 2/6] IP100A Fix Tx pause bug

----- Original Message ----- 
From: "Jeff Garzik" <jgarzik@...ox.com>
To: "Jesse Huang" <jesse@...lus.com.tw>
Cc: <linux-kernel@...r.kernel.org>; <netdev@...r.kernel.org>;
<akpm@...l.org>
Sent: Friday, August 18, 2006 7:27 PM
Subject: Re: [PATCH 2/6] IP100A Fix Tx pause bug

(1)
>> + 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.

(2)
> 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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