From: Arnd Bergmann <arnd@arndb.de>
To: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Pratyush Anand <pratyush.anand@st.com>,
Jingoo Han <jg1.han@samsung.com>,
"'Bjorn Helgaas'" <bhelgaas@google.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-samsung-soc@vger.kernel.org"
<linux-samsung-soc@vger.kernel.org>,
"'Kukjin Kim'" <kgene.kim@samsung.com>,
Mohit KUMAR DCG <Mohit.KUMAR@st.com>,
"'Sean Cross'" <xobs@kosagi.com>,
"'Thierry Reding'" <thierry.reding@gmail.com>,
"'SRIKANTH TUMKUR SHIVANAND'" <ts.srikanth@samsung.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Subject: Re: [PATCH V3] pci: exynos: split into two parts such as Synopsys part and Exynos part
Date: Thu, 26 Sep 2013 11:51:41 +0200 [thread overview]
Message-ID: <201309261151.42034.arnd@arndb.de> (raw)
In-Reply-To: <5243C0E5.7020508@ti.com>
On Thursday 26 September 2013, Kishon Vijay Abraham I wrote:
> On Wednesday 25 September 2013 02:53 AM, Arnd Bergmann wrote:
> > On Monday 23 September 2013, Kishon Vijay Abraham I wrote:
> >> Btw if we hadn't programmed inbound translation table, the address will go
> >> untranslated (according to the data book). I guess that's how it was working
> >> for Jingoo Han.
> >>
> >> **
> >> 3.10.4
> >> Inbound iATU Operation
> >>
> >> When there is no match, then the address is untranslated
> >> **
> >>
> >
> > Well, that should work just as well, since you have a 1:1 translation anyway.
> > Do you get the same error without the translation?
>
> Yes. I get the same non-fatal error interrupt in RC.
Ok, then I guess the translation is actually not at fault here but something
else. I would recommend looking at the IOMMU as the potential culprit. Maybe
having it disabled means that no DMA is going through, rather than all DMA
going through untranslated. Another possibility is that the IOMMU is set up
so that when disabled, it maps DMA address 0 to the start of RAM, rather
than identity mapping DMA address 0x80000000 there. If that's the case,
you either have to use the IOMMU, or set up the mapping in the root
complex to revert it.
Arnd
next prev parent reply other threads:[~2013-09-26 9:51 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-18 5:21 [PATCH V3] pci: exynos: split into two parts such as Synopsys part and Exynos part Jingoo Han
2013-07-22 15:03 ` Kishon Vijay Abraham I
2013-07-23 1:14 ` Jingoo Han
2013-07-23 4:49 ` Pratyush Anand
2013-07-23 6:29 ` Kishon Vijay Abraham I
2013-07-23 7:00 ` Jingoo Han
2013-07-24 21:02 ` Arnd Bergmann
2013-09-12 6:34 ` Kishon Vijay Abraham I
2013-09-12 7:15 ` Jingoo Han
2013-09-12 9:30 ` Pratyush Anand
2013-09-12 9:43 ` Kishon Vijay Abraham I
2013-09-12 9:52 ` Pratyush Anand
2013-09-12 10:07 ` Kishon Vijay Abraham I
2013-09-12 10:18 ` Pratyush Anand
2013-09-12 10:46 ` Pratyush Anand
2013-09-12 11:14 ` Kishon Vijay Abraham I
2013-09-21 14:56 ` Kishon Vijay Abraham I
2013-09-21 22:03 ` Arnd Bergmann
2013-09-22 11:16 ` Kishon Vijay Abraham I
2013-09-23 4:14 ` Pratyush Anand
2013-09-23 5:32 ` Kishon Vijay Abraham I
2013-09-23 6:50 ` Pratyush Anand
2013-09-24 21:23 ` Arnd Bergmann
2013-09-26 5:06 ` Kishon Vijay Abraham I
2013-09-26 9:51 ` Arnd Bergmann [this message]
2013-09-26 10:12 ` Kishon Vijay Abraham I
2013-09-12 10:25 ` Jingoo Han
2013-07-23 8:42 ` Jingoo Han
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