From: Adrian McMenamin <adrian@newgolddream.dyndns.info>
To: Mike Frysinger <vapier@gentoo.org>
Cc: linuxsh-dev@lists.sourceforge.net,
Adrian McMenamin <lkmladrian@gmail.com>,
Paul Mundt <lethal@linux-sh.org>,
linux-kernel@vger.kernel.org,
Mike Frysinger <vapier.adi@gmail.com>
Subject: Re: [PATCH] Patch pvr2 driver to allow development of maple bus driver
Date: Sat, 01 Sep 2007 10:35:27 +0100 [thread overview]
Message-ID: <1188639327.5992.3.camel@localhost.localdomain> (raw)
In-Reply-To: <200708312302.46542.vapier@gentoo.org>
On Fri, 2007-08-31 at 23:02 -0400, Mike Frysinger wrote:
> i really dont know how the maple bus works or what piece of hardware is wired
> up to the same interrupt line. my point is that if the other device fires an
> interrupt, the pvr interrupt handler may be executed and attempt to do work
> when in reality the pvr was not the source of the interrupt.
> -mike
The interrupt is *always* fired by the PVR - it is the VBLANK - ie
essentially screen refresh. It is *never* generated by the maple bus.
However, the maple bus is/can be hardware synced - which means once that
setting is made then the hardware will *always* be polled on the VBLANK.
In other words there is no need to check which device is interrupt is
for, because it is *always* going to be for both of them.
prev parent reply other threads:[~2007-09-01 9:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-31 20:00 Adrian McMenamin
2007-08-31 20:06 ` Fwd: " Adrian McMenamin
2007-08-31 20:12 ` Mike Frysinger
2007-08-31 20:14 ` Adrian McMenamin
2007-09-01 3:02 ` Mike Frysinger
2007-09-01 9:35 ` Adrian McMenamin [this message]
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