linux-kernel - Re: [BUG] pcmcia serial

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Date:	Tue, 13 Nov 2007 17:52:01 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	earny@...4u.de
Cc:	list-lkml@...4u.de, linux-kernel@...r.kernel.org
Subject: Re: [BUG] pcmcia serial_cs no interrupts

On Tue, 13 Nov 2007 17:55:25 +0100
Ernst Herzberg <list-lkml@...4u.de> wrote:

> 
> This pcmcia-card (UMTS Modem) only works if it shares his interrupt with
> another device, eg an usb mice. Moving the mice increases the connection
> speed, unplugging hangs the connection.

Thats consistent with the card not generating interrupts, or the
interrupts being misrouted. The serial driver polls the interrupt pending
bits on the chip so the actual serial chip is clearly expecting
interrupts to go somewhere. Given this seems to be card not laptop
specific it looks like there is magic intiialisation gloop required by
this chipset that we don't have.

> At the moment this card is my only way to reach the internet, but here in
> the hospital i have a lot time to test patches;)

You may want to boot with irqpoll that may help a bit.

Some info at: 

A helpful start would be to know if the setserial command (applied to
whatever tty your system calls the card) helps as given in:

https://bugs.launchpad.net/ubuntu/+source/pcmciautils/+bug/99479
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