[linux-cirrus] Re: EP93XX Ethernet autonegotiation hangs till link is up
- From: Michael Burian <dynmail1@xxxxxxxxxxxxxxxxx>
- To: linux-cirrus@xxxxxxxxxxxxx
- Date: Mon, 11 Jul 2005 14:47:05 +0200
Eric BENARD / Free wrote:
>>Any ideas what should be done instead of while(1)?
>>
>
> hi,
>
> I met the same problem and added a timeout like this :
>
>
> U8 timeout;
>
> phy_wr(4, 0x01e1); /*Set 802.3, 100M/10M Full/Half ability*/
> phy_wr(0,(1<<12)|(1<<9)); /* enable auto negotiation*/
>
> mdelay(100);
>
> while (1) {
> val = phy_rd(1); /* read BM status Reg*/
> if ( val&0x0020) /* if Auto_Neg_complete?*/
> {
> break;
> }
> if (25 == timeout++)
> break;
> }
>
>
> this is maybe not the best solution but that works fine and prevent the
> system to hang ;-)
Random thoughts:
I'm not sure if this is the right way
If the above code works we might be able to completely remove the
while(1) and "if(25" loop.
I doubt that something that fails after mdelay(100) will work after
(mdelay(100) + time_needed_to_execute_phy_rd_25_times), as
time_needed_to_execute_phy_rd_25_times should be next to zero, right?
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