From: Stefan Roese <sr@denx•de>
To: linuxppc-dev@lists•ozlabs.org
Cc: Andrea Zypchen <azypchen@intldata•ca>,
Pravin Bathija <pbathija@amcc•com>,
lebon@lebon•org.ua, Prodyut Hazarika <phazarika@amcc•com>,
tburns@datacast•com, azilkie@datacast•com
Subject: Re: AW: PowerPC PCI DMA issues (prefetch/coherency?)
Date: Fri, 11 Sep 2009 07:12:11 +0200 [thread overview]
Message-ID: <200909110712.11858.sr@denx.de> (raw)
In-Reply-To: <1252637074.8566.56.camel@pasglop>
On Friday 11 September 2009 04:44:34 Benjamin Herrenschmidt wrote:
> On Thu, 2009-09-10 at 13:30 -0700, Pravin Bathija wrote:
> > There is also a patch that was submitted for 440EPX a couple of years
> > back. The 440EPX SOC causes hangs with Memory Read Multiple (MRM)
> > commands. Whether MRM is used or not depends on the value of
> > PCI_CACHE_LINE_SIZE register. I see that the changes are no longer
> > present in linux 2.6.30+ kernels. Although the patch certainly resolved
> > the hang issue with Silicon Image 680 PATA card as the 680 driver
> > attempts to use MRM commands - I don't know if it would resolve the data
> > corruption issue. It is certainly worth trying in my opinion. Below is a
> > link to the patch submission:
> >
> > http://git.denx.de/?p=linux-2.6-denx.git;a=commit;h=cffefde924123e685327
> > 48dd58fcb780eab5e219
>
> The changes in the above repository is a quick hack that can't be merged
> as-is (and afaik hasn't been submitted).
>
> If indeed we need to clamp the PCI cache line size on those critters,
> then we need something in ppc4xx_pci.c to detect the need, set
> pci_cache_line_size to 0 and eventually fixup the existing values in
> devices in case u-boot don't have them right.
>
> Care to send a patch ? :-)
It's already there. See commit:
5ce4b59653b2c2053cd9a011918ac1e4747f24cc
powerpc/4xx: Workaround for PPC440EPx/GRx PCI_28 Errata
Cheers,
Stefan
next prev parent reply other threads:[~2009-09-11 5:12 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-02 21:22 AW: PowerPC PCI DMA issues (prefetch/coherency?) Adam Zilkie
2009-09-03 8:05 ` Chris Pringle
2009-09-03 9:57 ` Benjamin Herrenschmidt
2009-09-03 16:04 ` Adam Zilkie
2009-09-03 16:21 ` Josh Boyer
2009-09-03 20:27 ` Prodyut Hazarika
2009-09-08 18:01 ` Adam Zilkie
2009-09-08 18:59 ` Prodyut Hazarika
2009-09-08 19:30 ` Adam Zilkie
2009-09-08 19:56 ` Prodyut Hazarika
2009-09-08 20:00 ` Adam Zilkie
2009-09-09 1:34 ` Benjamin Herrenschmidt
2009-09-08 21:34 ` Benjamin Herrenschmidt
2009-09-09 13:28 ` Mikhail Zolotaryov
2009-09-09 13:43 ` Tom Burns
2009-09-09 14:12 ` Mikhail Zolotaryov
2009-09-09 14:10 ` Tom Burns
2009-09-09 14:40 ` Mikhail Zolotaryov
2009-09-11 1:57 ` Benjamin Herrenschmidt
2009-09-11 7:17 ` Mikhail Zolotaryov
2009-09-11 7:31 ` Benjamin Herrenschmidt
2009-09-11 1:57 ` Benjamin Herrenschmidt
2009-09-10 19:53 ` Tom Burns
2009-09-10 20:30 ` Pravin Bathija
2009-09-11 2:44 ` Benjamin Herrenschmidt
2009-09-11 5:12 ` Stefan Roese [this message]
2009-09-11 5:17 ` Benjamin Herrenschmidt
2009-09-11 5:25 ` Stefan Roese
2009-09-11 5:35 ` Pravin Bathija
2009-09-11 5:40 ` Benjamin Herrenschmidt
2009-09-11 9:23 ` Pravin Bathija
2009-09-11 1:59 ` Benjamin Herrenschmidt
2009-09-11 16:05 ` Prodyut Hazarika
2009-09-11 1:55 ` Benjamin Herrenschmidt
2009-09-11 13:51 ` Tom Burns
2009-09-08 21:29 ` Benjamin Herrenschmidt
2009-09-03 12:20 ` Wrobel Heinz-R39252
2009-09-03 12:43 ` Chris Pringle
2009-09-06 21:32 ` Benjamin Herrenschmidt
2009-09-03 15:54 ` Adam Zilkie
[not found] <4A37A503.3030209@oxtel.com>
[not found] ` <20090616162114.GA5051@loki.buserror.net>
[not found] ` <4A37C97A.5050508@oxtel.com>
2009-06-16 16:46 ` Scott Wood
2009-06-16 16:57 ` Chris Pringle
2009-06-16 17:03 ` Scott Wood
2009-06-17 7:58 ` Chris Pringle
2009-06-17 13:18 ` Chris Pringle
2009-06-18 11:24 ` Chris Pringle
2009-06-22 14:31 ` AW: " Sergej.Stepanov
2009-06-29 8:11 ` Chris Pringle
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