linux-kernel - Re: [PATCH v3] dma-mapping: skip USB devices when configuring DMA during probe

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Date:   Fri, 11 Aug 2017 08:02:32 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Johan Hovold <johan@...nel.org>, Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andreas Färber <afaerber@...e.de>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alan Stern <stern@...land.harvard.edu>,
        stable <stable@...r.kernel.org>,
        Sricharan R <sricharan@...eaurora.org>,
        Eric Anholt <eric@...olt.net>
Subject: Re: [PATCH v3] dma-mapping: skip USB devices when configuring DMA
 during probe

Hi Robin,

Am 08.08.2017 um 20:03 schrieb Johan Hovold:
> On Sat, Aug 05, 2017 at 10:38:07AM +0200, Christoph Hellwig wrote:
>> I think the root problem is that the code added by
>> " of/acpi: Configure dma operations at probe time for platform/amba/pci bus
>> devices"
>>
>> is completely bogus and needs to be reverted.  We can't simply iterate
>> over all devices in the system and set up dma for them.  We'll need
>> to ask the firmware / OF what root port this applies to and only
>> apply it to those buses.
> I'm afraid I haven't had time to look any more at this, and now I'll be
> offline for the next two weeks.
>
> It sounded like Robin was working on a fix for the broken DMA-mask on
> RPI3 and that should address Hans's ethernet regression too even if we
> ultimately need to fix dma_configure() as well.

can you confirm that DMA-mask on RPI3 is broken? Why?

>
> Thanks,
> Johan