From: Kenneth Johansson <kenneth.johansson@etx.ericsson.se>
To: Kent Borg <kentborg@borg.org>
Cc: "linuxppc-embedded@lists.linuxppc.org"
<linuxppc-embedded@lists.linuxppc.org>
Subject: Re: Why ack interrupt before calling handler?
Date: 11 Jun 2003 14:58:32 +0200 [thread overview]
Message-ID: <1055336312.26152.104.camel@spawn> (raw)
In-Reply-To: <20030611083953.A26856@borg.org>
On Wed, 2003-06-11 at 14:39, Kent Borg wrote:
> On Wed, Jun 11, 2003 at 12:33:42PM +0200, Kenneth Johansson wrote:
> Finally the interrupt end gets called, which acks and enables the
> interrupt. This ack actually does something for me.
>
Hopefully this ack only happens if the interrupt is level triggered
otherwise you have a problem.
> I am thinking that the general purpose PPC code does the early
> ack for edge-triggered circumstances. For latched level-triggered
> cases there is no harm in the extra early ack.
Thats right.
--
Kenneth Johansson
Ericsson AB Tel: +46 8 719 70 20
Tellusborgsvägen 90 Fax: +46 8 719 29 45
126 25 Stockholm ken@switchboard.ericsson.se
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2003-06-11 12:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-06 18:29 Why ack interrupt before calling handler? Kent Borg
2003-06-11 10:33 ` Kenneth Johansson
2003-06-11 11:28 ` Wolfgang Denk
2003-06-11 12:24 ` eric lescouet
2003-06-11 12:51 ` Kent Borg
2003-06-11 12:39 ` Kent Borg
2003-06-11 12:58 ` Kenneth Johansson [this message]
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