linux-kernel - Re: Questions about IOMMU & PCIe switch

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Message-ID: <54AD3D0B.6060501@apollo.lv>
Date:	Wed, 07 Jan 2015 16:04:59 +0200
From:	Raimonds Cicans <ray@...llo.lv>
To:	Clemens Ladisch <clemens@...isch.de>, linux-kernel@...r.kernel.org
Subject: Re: Questions about IOMMU & PCIe switch

On 07.01.2015 14:09, Clemens Ladisch wrote:
> Raimonds Cicans wrote:
>> We have two kinds of PCIe cards:
>> A1 - based on chip B
>> A2 - based on same chip B but behind PCIe switch
>>
>> Card A1 work flawlessly in any configuration,
>> but card A2 work flawlessly only if system
>> lack IOMMU or have disabled IOMMU
> In theory, such a switch should be transparent.
>
>> Do we have to treat card with PCIe switch in special way?
> No.  But the switch has to work correctly, and driver must be
> written correctly.
>
> Which switch?  Which driver?

We talk about TBS 6285 Quad DVB-T PCIe receiver card.
Starting from version V20 manufacturer added Pericom
PCIe switch PI7C9X2G304SL.

Card have 2 out of kernel drivers:
1) Semi open from TBS:
http://www.tbsdtv.com/download/document/common/tbs-linux-drivers_v141225.zip

2) Open from: https://github.com/ljalves/linux_media

If you want more information you can look at open ticket:
https://github.com/ljalves/linux_media/issues/66


Raimonds Cicans

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