Messages in this thread | | | From | "Jesse Huang" <> | Subject | Re: [PATCH 2/6] IP100A Fix Tx pause bug | Date | Tue, 22 Aug 2006 09:17:08 +0800 |
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----- Original Message ----- From: "Jeff Garzik" <jgarzik@pobox.com> To: "Jesse Huang" <jesse@icplus.com.tw> Cc: <linux-kernel@vger.kernel.org>; <netdev@vger.kernel.org>; <akpm@osdl.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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