linux-kernel - Re: [PATCH] spi: spi-fsl-dspi: fix DMA mapping

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Date:   Tue, 10 Mar 2020 15:12:45 +0100
From:   Michael Walle <michael@...le.cc>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     linux-spi@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH] spi: spi-fsl-dspi: fix DMA mapping

Am 2020-03-10 14:02, schrieb Vladimir Oltean:
> On Tue, 10 Mar 2020 at 10:12, Michael Walle <michael@...le.cc> wrote:
>> 
>> Am 2020-03-10 08:40, schrieb Michael Walle:
>> > Am 2020-03-10 08:33, schrieb Michael Walle:
>> >> Use the correct device to request the DMA mapping. Otherwise the IOMMU
>> >> doesn't get the mapping and it will generate a page fault.
>> >>
>> >> The error messages look like:
>> >> [    3.008452] arm-smmu 5000000.iommu: Unhandled context fault:
>> >> fsr=0x402, iova=0xf9800000, fsynr=0x3f0022, cbfrsynra=0x828, cb=8
>> >> [    3.020123] arm-smmu 5000000.iommu: Unhandled context fault:
>> >> fsr=0x402, iova=0xf9800000, fsynr=0x3f0022, cbfrsynra=0x828, cb=8
>> >>
>> >> This was tested on a custom board with a LS1028A SoC.
>> >
>> > Oh fu.. please disregard this patch. DMA mapping still isn't working.
>> > Somehow I missed that the transfer mode was turned back to its default
>> > XSPI mode.
>> 
>> Damn. I need more coffee.. this patch IS working. Only the first probe
>> fails due to EPROBE_DEFER.
>> 
>> [    2.539706] fsl-dspi 2120000.spi: rx dma channel not available 
>> (-517)
>> [    2.546200] fsl-dspi 2120000.spi: can't get dma channels
>> [    3.622774] spi-nor spi1.0: w25q128fw (16384 Kbytes)
>> 
>> -michael
> 
> I'm testing LS1028A with IOMMU_DEFAULT_PASSTHROUGH=y and I didn't have
> time to change my setup now. I've also sent a v3 to my patch series
> which is going to conflict with this one, sorry.

No worries, its easy enough to rebase.

> I would have picked
> your patch up with my series but I didn't have the right environment
> to test it.

I'll resend a v2 once your series is working.

-michael