linux-kernel - Re: [PATCH 2/4 v4] i.MX31: Image Processing Unit DMA and IRQ drivers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Tue, 23 Dec 2008 18:14:37 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net, adaplas@...il.com,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH 2/4 v4] i.MX31: Image Processing Unit DMA and IRQ
	drivers

On Tue, Dec 23, 2008 at 05:33:11PM +0100, Guennadi Liakhovetski wrote:
> 
> These all are just slightly different variations - with this one you'd 
> have to scan dma channels in your dma irq handler, which I currently don't 
> have to do.
> 
> > That said I'm not sure whether we need a chained interrupt handler at all.
> > Looking at the remaining interrupts it seems that for example the
> > CSI_EOF (IPU_INT_STAT3 bit 5) interrupt is redundant to the corresponding
> > channels interrupt. In the camera driver you already realized that it's
> > the dma end event you're interested in, not the CSI_EOF event. Not sure
> > if that holds for the other interrupts though.
> 
> I think the version with a lookup table is optimal - it uses standard 
> mechanisms for irq handling and doesn't waste RAM. The disadvantage - 
> every addition will need driver modification...
> 
> But ok, this is taking way too long. Just tell me which way you'd like to 
> have it and I'll do it.

Preferably a way which does not involve introducing 100+ unused
interrupts.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/